<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:d2741105-2b93-4b2a-bc69-56de7d637fd1,g:53734935-395b-4ac1-beee-0e9a2b649a8d-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.americantower.com/role/Cover" xlink:type="simple" xlink:href="amt-20201231.xsd#Cover"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/Cover" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_f072b56a-b6af-4cf5-9df5-4492e4047875" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_2bdf08e0-0e27-4293-8f73-ee4931e0dd0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_f072b56a-b6af-4cf5-9df5-4492e4047875" xlink:to="loc_us-gaap_Liabilities_2bdf08e0-0e27-4293-8f73-ee4931e0dd0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_86bdbe5e-0c7f-45b4-aaf7-5aad144b346b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_f072b56a-b6af-4cf5-9df5-4492e4047875" xlink:to="loc_us-gaap_CommitmentsAndContingencies_86bdbe5e-0c7f-45b4-aaf7-5aad144b346b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_daec8939-5195-49ad-a262-fb4ea9e69a40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_f072b56a-b6af-4cf5-9df5-4492e4047875" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_daec8939-5195-49ad-a262-fb4ea9e69a40" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_7ac5e868-7f60-4978-a686-3a23b72d8754" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_f072b56a-b6af-4cf5-9df5-4492e4047875" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_7ac5e868-7f60-4978-a686-3a23b72d8754" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_a3c29ace-41c4-47d3-93c8-c479c14708ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_Goodwill_a3c29ace-41c4-47d3-93c8-c479c14708ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_78b237b0-9192-48af-9030-871b5a726e08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_78b237b0-9192-48af-9030-871b5a726e08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_9af5b66d-8172-4caa-adc3-1f9e929df84b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_9af5b66d-8172-4caa-adc3-1f9e929df84b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_2118cd7e-9968-461a-a2c4-eb148293de4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_2118cd7e-9968-461a-a2c4-eb148293de4e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_eda4ba44-4297-4eec-bc36-7c6df2ee7211" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_eda4ba44-4297-4eec-bc36-7c6df2ee7211" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_cb177a64-ab04-4adc-88f2-78639e821cf9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_cb177a64-ab04-4adc-88f2-78639e821cf9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRentReceivablesNetNoncurrent_d0e016b2-d5e2-4368-915c-fa09322809a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredRentReceivablesNetNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_DeferredRentReceivablesNetNoncurrent_d0e016b2-d5e2-4368-915c-fa09322809a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_95a27fdd-c6d1-4b2b-9777-d27233f87cb3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_28f5c6da-f493-4b82-b4e0-82cd6c5b75c9" xlink:to="loc_us-gaap_AssetsCurrent_95a27fdd-c6d1-4b2b-9777-d27233f87cb3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_988b7bb1-2fbd-4be6-adbb-6d66839f82d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:to="loc_us-gaap_LiabilitiesCurrent_988b7bb1-2fbd-4be6-adbb-6d66839f82d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_0cf82dcc-23f9-4028-8c14-f2b6af4b6095" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_0cf82dcc-23f9-4028-8c14-f2b6af4b6095" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligation_0f31b944-4e8a-4978-a037-e2612dd2e2dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetRetirementObligation"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:to="loc_us-gaap_AssetRetirementObligation_0f31b944-4e8a-4978-a037-e2612dd2e2dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_a7e6ffd3-34f4-4851-a93f-bf4f266a0dab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_a7e6ffd3-34f4-4851-a93f-bf4f266a0dab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_5e018a5e-6c59-4720-ae7b-8332871b1495" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_5e018a5e-6c59-4720-ae7b-8332871b1495" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_8eb27b93-b416-4892-93dc-68eb5b604b20" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_9fada1ee-454b-41dc-bd03-c894e363c5a0" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_8eb27b93-b416-4892-93dc-68eb5b604b20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_52c718dc-add8-40ea-93a3-f46849ed7225" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_AccountsPayableCurrent_52c718dc-add8-40ea-93a3-f46849ed7225" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_a0aa72f0-6db8-4058-8e44-3a175f56b967" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_a0aa72f0-6db8-4058-8e44-3a175f56b967" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrent_a68c5f1e-84c4-48e1-a97c-9dc9474fb0f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DividendsPayableCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_DividendsPayableCurrent_a68c5f1e-84c4-48e1-a97c-9dc9474fb0f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrent_992954c0-456a-4b5a-8818-15466322b07e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestPayableCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_InterestPayableCurrent_992954c0-456a-4b5a-8818-15466322b07e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_643df88e-18f2-4578-8230-ea08b9a7c84d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_LongTermDebtCurrent_643df88e-18f2-4578-8230-ea08b9a7c84d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_64193435-cb46-41f6-8efd-ff562a7c2908" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_64193435-cb46-41f6-8efd-ff562a7c2908" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_225bee70-c8bf-47fe-a34e-c8a4f76dfc5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_e5ea7a54-ec0e-44cb-9bd3-bda45f1deabd" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_225bee70-c8bf-47fe-a34e-c8a4f76dfc5b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b017d255-c417-420d-8e65-8fd4f473c0bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_821d3d38-8f11-4d21-bd62-1dc22187c625" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b017d255-c417-420d-8e65-8fd4f473c0bc" xlink:to="loc_us-gaap_StockholdersEquity_821d3d38-8f11-4d21-bd62-1dc22187c625" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_d7e1c0e6-9739-4168-befc-6ae8d7b7e5aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b017d255-c417-420d-8e65-8fd4f473c0bc" xlink:to="loc_us-gaap_MinorityInterest_d7e1c0e6-9739-4168-befc-6ae8d7b7e5aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_177f0443-0ec7-4c3d-a56e-099019c99d71" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b017d255-c417-420d-8e65-8fd4f473c0bc" xlink:to="loc_us-gaap_CommitmentsAndContingencies_177f0443-0ec7-4c3d-a56e-099019c99d71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_0ab28462-9f99-47c4-9bc3-d297ce2ff266" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_5e3623c6-7cba-48ed-8c8b-d239bdbf1b42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_0ab28462-9f99-47c4-9bc3-d297ce2ff266" xlink:to="loc_us-gaap_CommonStockValue_5e3623c6-7cba-48ed-8c8b-d239bdbf1b42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_25f89a09-d3cc-4c1a-88e6-9df82c1bd491" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_0ab28462-9f99-47c4-9bc3-d297ce2ff266" xlink:to="loc_us-gaap_AdditionalPaidInCapital_25f89a09-d3cc-4c1a-88e6-9df82c1bd491" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_672675fb-038a-4616-b8aa-377b095313a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_0ab28462-9f99-47c4-9bc3-d297ce2ff266" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_672675fb-038a-4616-b8aa-377b095313a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_1d433a07-605f-4c10-8909-eeaac7b67c95" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_0ab28462-9f99-47c4-9bc3-d297ce2ff266" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_1d433a07-605f-4c10-8909-eeaac7b67c95" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_d1ff0a75-0d9f-4f98-90e2-f42455a5588a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_0ab28462-9f99-47c4-9bc3-d297ce2ff266" xlink:to="loc_us-gaap_TreasuryStockValue_d1ff0a75-0d9f-4f98-90e2-f42455a5588a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_872e3b75-8074-4e93-9d83-7b6a28df9e4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_12d9beb3-7cbf-4b2b-932a-891777a503cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_872e3b75-8074-4e93-9d83-7b6a28df9e4c" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_12d9beb3-7cbf-4b2b-932a-891777a503cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_153e04ec-83a8-4363-a6c8-aeab588c3d1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_872e3b75-8074-4e93-9d83-7b6a28df9e4c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_153e04ec-83a8-4363-a6c8-aeab588c3d1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_3c57c047-6273-4408-b370-54bdcf4ac590" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_872e3b75-8074-4e93-9d83-7b6a28df9e4c" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_3c57c047-6273-4408-b370-54bdcf4ac590" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_488cd2d4-370f-4019-9c38-4b6a05d1875c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_872e3b75-8074-4e93-9d83-7b6a28df9e4c" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_488cd2d4-370f-4019-9c38-4b6a05d1875c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_53e204a5-ca70-4192-b29e-14c44d69cb75" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_37ff31fa-d4a8-4c90-bd0a-ad45b9e7587b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_53e204a5-ca70-4192-b29e-14c44d69cb75" xlink:to="loc_us-gaap_ProfitLoss_37ff31fa-d4a8-4c90-bd0a-ad45b9e7587b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7b4c43d1-93ae-4568-a782-716344f43416" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_53e204a5-ca70-4192-b29e-14c44d69cb75" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7b4c43d1-93ae-4568-a782-716344f43416" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_a09403f2-f7c1-416c-9df6-5dee5e544b2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_e03e31df-a23e-46ed-8bd1-45b56ceaed4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_a09403f2-f7c1-416c-9df6-5dee5e544b2e" xlink:to="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_e03e31df-a23e-46ed-8bd1-45b56ceaed4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_66b23441-5a1b-41cf-bcd0-8f8535a7e4a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_a09403f2-f7c1-416c-9df6-5dee5e544b2e" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_66b23441-5a1b-41cf-bcd0-8f8535a7e4a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2a70e5d2-6024-472c-83cc-c60c6f781b72" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_a09403f2-f7c1-416c-9df6-5dee5e544b2e" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2a70e5d2-6024-472c-83cc-c60c6f781b72" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_2bfbc5ed-0880-4010-b02f-c59429d968ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_a09403f2-f7c1-416c-9df6-5dee5e544b2e" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_2bfbc5ed-0880-4010-b02f-c59429d968ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_b1100d75-4d80-4277-831c-3df6b6ee9242" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_a09403f2-f7c1-416c-9df6-5dee5e544b2e" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_b1100d75-4d80-4277-831c-3df6b6ee9242" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_b48b69c5-16a2-43d6-aec8-8c1be2f03a21" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_b8611d18-7b84-4131-8f50-11b495684c9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_b48b69c5-16a2-43d6-aec8-8c1be2f03a21" xlink:to="loc_us-gaap_CostsAndExpenses_b8611d18-7b84-4131-8f50-11b495684c9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_7e91b0ad-2442-4f82-8a50-2fca473c5414" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_b48b69c5-16a2-43d6-aec8-8c1be2f03a21" xlink:to="loc_us-gaap_Revenues_7e91b0ad-2442-4f82-8a50-2fca473c5414" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8c9b2442-1d0e-4aab-bb08-4ae494d080b6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_7b0a3418-876d-4f5a-9144-423f4ddd0548" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8c9b2442-1d0e-4aab-bb08-4ae494d080b6" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_7b0a3418-876d-4f5a-9144-423f4ddd0548" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_8ad1de4b-0ee2-4be6-afe4-d19ad857fae1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8c9b2442-1d0e-4aab-bb08-4ae494d080b6" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_8ad1de4b-0ee2-4be6-afe4-d19ad857fae1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_50022ce9-dd98-4914-b896-792e1c4afa4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_1f794da7-8943-402d-8c82-632b2eab858a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_50022ce9-dd98-4914-b896-792e1c4afa4d" xlink:to="loc_us-gaap_NetIncomeLoss_1f794da7-8943-402d-8c82-632b2eab858a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_16ad6df1-b7b7-494d-86c2-0f3eb3ed596e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_50022ce9-dd98-4914-b896-792e1c4afa4d" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_16ad6df1-b7b7-494d-86c2-0f3eb3ed596e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_d96fd1bc-2884-4609-b477-9e947fa591e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_e5531f65-48d1-4c99-835e-4804e2b7b73f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_d96fd1bc-2884-4609-b477-9e947fa591e4" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_e5531f65-48d1-4c99-835e-4804e2b7b73f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_130c6690-4e08-4f3d-99a8-21b4cd8d4f39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeOther"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_d96fd1bc-2884-4609-b477-9e947fa591e4" xlink:to="loc_us-gaap_InterestIncomeOther_130c6690-4e08-4f3d-99a8-21b4cd8d4f39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_3667f9ea-3e55-4911-b68d-4a993c41069e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_d96fd1bc-2884-4609-b477-9e947fa591e4" xlink:to="loc_us-gaap_InterestExpense_3667f9ea-3e55-4911-b68d-4a993c41069e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_29606e78-17d3-433f-96cb-22eb7488647f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_d96fd1bc-2884-4609-b477-9e947fa591e4" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_29606e78-17d3-433f-96cb-22eb7488647f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_c6c605da-3193-476a-b95f-2d2abceb9cb5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_d96fd1bc-2884-4609-b477-9e947fa591e4" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_c6c605da-3193-476a-b95f-2d2abceb9cb5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_8818d49e-ee8e-4067-8cfd-2d88396597cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_e17f529a-ee4b-42e3-bb8c-03346709d4db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_8818d49e-ee8e-4067-8cfd-2d88396597cd" xlink:to="loc_us-gaap_OperatingIncomeLoss_e17f529a-ee4b-42e3-bb8c-03346709d4db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_dcff04d9-c581-4ecd-8387-2b926e9661a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_8818d49e-ee8e-4067-8cfd-2d88396597cd" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_dcff04d9-c581-4ecd-8387-2b926e9661a7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_be6428c0-0611-4317-9cfa-ae73d2196c3e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_c50d45d2-5c54-4598-9489-e964ff870caf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_be6428c0-0611-4317-9cfa-ae73d2196c3e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_c50d45d2-5c54-4598-9489-e964ff870caf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_3adeb558-3653-4197-a1e7-31498d15f1cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_be6428c0-0611-4317-9cfa-ae73d2196c3e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_3adeb558-3653-4197-a1e7-31498d15f1cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest_db125ba2-4630-4e8c-b29c-4d3d25bff25a" xlink:href="amt-20201231.xsd#amt_ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_be6428c0-0611-4317-9cfa-ae73d2196c3e" xlink:to="loc_amt_ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest_db125ba2-4630-4e8c-b29c-4d3d25bff25a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2c87c8a8-b1a9-4c0a-a946-7131f96468c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_03432a31-2f72-49e8-9b86-50f09d8d984a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2c87c8a8-b1a9-4c0a-a946-7131f96468c6" xlink:to="loc_us-gaap_ProfitLoss_03432a31-2f72-49e8-9b86-50f09d8d984a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_4ad4d26b-28bd-42f5-9018-07c96513253f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2c87c8a8-b1a9-4c0a-a946-7131f96468c6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_4ad4d26b-28bd-42f5-9018-07c96513253f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f3e51b26-cd77-4104-8160-e2f9045a71b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_2261933d-f653-4534-ba12-f27b4fad5181" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f3e51b26-cd77-4104-8160-e2f9045a71b4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_2261933d-f653-4534-ba12-f27b4fad5181" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_e3b22dc8-c139-407b-bc1f-f49109b985dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f3e51b26-cd77-4104-8160-e2f9045a71b4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_e3b22dc8-c139-407b-bc1f-f49109b985dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax_7f5e1474-13cf-4b46-9b72-84ea8a69e1f5" xlink:href="amt-20201231.xsd#amt_OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f3e51b26-cd77-4104-8160-e2f9045a71b4" xlink:to="loc_amt_OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax_7f5e1474-13cf-4b46-9b72-84ea8a69e1f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax_464ae0d5-da14-41a3-bcc6-b1a17eedc683" xlink:href="amt-20201231.xsd#amt_OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f3e51b26-cd77-4104-8160-e2f9045a71b4" xlink:to="loc_amt_OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax_464ae0d5-da14-41a3-bcc6-b1a17eedc683" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_cd890634-31c5-44a0-8c5e-90ed3a69a7c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_f3e51b26-cd77-4104-8160-e2f9045a71b4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_cd890634-31c5-44a0-8c5e-90ed3a69a7c3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSParenthetical" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSParenthetical"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="amt-20201231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_b1f3ec45-1a70-4e34-b3cf-d7ce94cf866d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_ProfitLoss_b1f3ec45-1a70-4e34-b3cf-d7ce94cf866d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_b79cdedf-04d9-42ca-8251-6cfdfbae6653" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_b79cdedf-04d9-42ca-8251-6cfdfbae6653" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_1e52722c-3e8d-4687-ac5e-13ae654e1f48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_ShareBasedCompensation_1e52722c-3e8d-4687-ac5e-13ae654e1f48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_LossGainOnInvestmentsAndOtherNonCashIncomeExpense_9f2ac805-d174-491d-a62a-3814921dbd1a" xlink:href="amt-20201231.xsd#amt_LossGainOnInvestmentsAndOtherNonCashIncomeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_amt_LossGainOnInvestmentsAndOtherNonCashIncomeExpense_9f2ac805-d174-491d-a62a-3814921dbd1a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_b45c60a6-2005-433a-9d20-70d279a2baea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_b45c60a6-2005-433a-9d20-70d279a2baea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtGainLossNetOfTax_fd78e8a8-d888-4962-b851-5807073fbec6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ExtinguishmentOfDebtGainLossNetOfTax"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_ExtinguishmentOfDebtGainLossNetOfTax_fd78e8a8-d888-4962-b851-5807073fbec6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_335163b3-8e05-4f5d-a27e-c24025f914d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_335163b3-8e05-4f5d-a27e-c24025f914d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_c8a4e4ce-c21d-4737-bf5a-d52820a4bc99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_c8a4e4ce-c21d-4737-bf5a-d52820a4bc99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_dfb2fc31-c92c-4bed-997a-811b30396960" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_dfb2fc31-c92c-4bed-997a-811b30396960" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_d53d0370-324b-4715-8990-d5e8d858a557" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_d53d0370-324b-4715-8990-d5e8d858a557" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_aa78d2bc-b0fa-4f68-8ded-e0bca95c992c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_aa78d2bc-b0fa-4f68-8ded-e0bca95c992c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_4bfa1ef0-76a9-4d2a-ad27-f935ca3f88a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_4bfa1ef0-76a9-4d2a-ad27-f935ca3f88a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_2c47b342-19e3-43ee-b6aa-d2b708ee6e24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_2c47b342-19e3-43ee-b6aa-d2b708ee6e24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_IncreaseDecreaseInDeferredRentLiability_16a4964a-0cda-46b0-b6a6-3b6c2352c6d7" xlink:href="amt-20201231.xsd#amt_IncreaseDecreaseInDeferredRentLiability"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_amt_IncreaseDecreaseInDeferredRentLiability_16a4964a-0cda-46b0-b6a6-3b6c2352c6d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_da3843bb-fb4c-49f2-9195-d3abad515409" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_da3843bb-fb4c-49f2-9195-d3abad515409" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StraightLineRent_a6ed8ae9-f7a1-4697-9dd2-95e011636de1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StraightLineRent"/>
    <link:calculationArc order="16" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_us-gaap_StraightLineRent_a6ed8ae9-f7a1-4697-9dd2-95e011636de1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability_4aa1ccbd-67b2-4bef-9398-3998a7ac25b8" xlink:href="amt-20201231.xsd#amt_IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability"/>
    <link:calculationArc order="17" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ea5b567c-bfc9-415c-97a7-6944ac7fa4f5" xlink:to="loc_amt_IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability_4aa1ccbd-67b2-4bef-9398-3998a7ac25b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9b2f586e-1cbd-424e-b996-9d5b0c6c4bf0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_26eb6660-cbf0-4248-8155-7247aed046c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9b2f586e-1cbd-424e-b996-9d5b0c6c4bf0" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_26eb6660-cbf0-4248-8155-7247aed046c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_24bfc4f0-cac7-4fc4-902d-27464626948e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9b2f586e-1cbd-424e-b996-9d5b0c6c4bf0" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_24bfc4f0-cac7-4fc4-902d-27464626948e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets_3274d3c1-3ad1-4e27-96cf-ca290effad2f" xlink:href="amt-20201231.xsd#amt_ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9b2f586e-1cbd-424e-b996-9d5b0c6c4bf0" xlink:to="loc_amt_ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets_3274d3c1-3ad1-4e27-96cf-ca290effad2f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_fa57e8d4-8f84-49cb-8dff-cc93bf9e076b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9b2f586e-1cbd-424e-b996-9d5b0c6c4bf0" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_fa57e8d4-8f84-49cb-8dff-cc93bf9e076b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_cb1cb0e9-4129-4852-b0c8-cba0fa0e58ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9b2f586e-1cbd-424e-b996-9d5b0c6c4bf0" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_cb1cb0e9-4129-4852-b0c8-cba0fa0e58ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_cd05b601-54a4-49f7-9174-99c5067164f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_cd05b601-54a4-49f7-9174-99c5067164f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSecuredDebt_105e6c67-b9f9-4d18-927b-c81afd47f2ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSecuredDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSecuredDebt_105e6c67-b9f9-4d18-927b-c81afd47f2ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_fff6e7ef-bc13-4a32-bd6e-2fd6e8c769bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_fff6e7ef-bc13-4a32-bd6e-2fd6e8c769bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_4a0c263b-d840-4203-bc8f-671f3b61943f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_4a0c263b-d840-4203-bc8f-671f3b61943f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_92118339-d707-4ecb-9c65-de92d1825d97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_92118339-d707-4ecb-9c65-de92d1825d97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_9d8a4509-c451-4431-b00a-728702b7b141" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_9d8a4509-c451-4431-b00a-728702b7b141" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_b6c60068-8e0d-4840-94df-383ac538b01e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_b6c60068-8e0d-4840-94df-383ac538b01e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_39e356ae-87d8-4d1a-a991-428e03ce4303" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_39e356ae-87d8-4d1a-a991-428e03ce4303" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_706cdd81-ae81-424e-af1a-2a176e560719" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_706cdd81-ae81-424e-af1a-2a176e560719" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_c657e86c-5a9a-4979-bd90-5afbbddfa345" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfUnsecuredDebt"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_c657e86c-5a9a-4979-bd90-5afbbddfa345" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_ef2bb7cf-6b8e-4ec6-ae17-262fa48b7591" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_ef2bb7cf-6b8e-4ec6-ae17-262fa48b7591" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_e8e87ec6-2a34-4a9f-b27e-2ba5b37da132" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_e8e87ec6-2a34-4a9f-b27e-2ba5b37da132" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_e3b2bce6-daaf-4503-a541-fc3ac6ecfe66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_e3b2bce6-daaf-4503-a541-fc3ac6ecfe66" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsMinorityInterest_a67556fc-22d8-4b0a-a980-bfed81d239dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsMinorityInterest"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4988fdfb-97b6-44b5-8213-6c277facc117" xlink:to="loc_us-gaap_PaymentsOfDividendsMinorityInterest_a67556fc-22d8-4b0a-a980-bfed81d239dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8db93180-1967-472e-bfa8-bad11a1476da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1a30696b-7a72-4dd8-84c7-685ccd9fce15" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8db93180-1967-472e-bfa8-bad11a1476da" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1a30696b-7a72-4dd8-84c7-685ccd9fce15" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_dd007cfd-ac96-44a7-8108-2b485d8ecf54" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8db93180-1967-472e-bfa8-bad11a1476da" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_dd007cfd-ac96-44a7-8108-2b485d8ecf54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86b98e5b-44aa-4e51-ad3d-7b30e13776bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8db93180-1967-472e-bfa8-bad11a1476da" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_86b98e5b-44aa-4e51-ad3d-7b30e13776bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f58b27bb-364a-4858-b4f2-1656abb48cd5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8db93180-1967-472e-bfa8-bad11a1476da" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f58b27bb-364a-4858-b4f2-1656abb48cd5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPrinciplesofConsolidationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPrinciplesofConsolidationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPrinciplesofConsolidationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESSegmentsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESSegmentsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESSegmentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsReceivableandDeferredRentAssetDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsReceivableandDeferredRentAssetDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAccountsReceivableandDeferredRentAssetDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESChangesinAllowancesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESChangesinAllowancesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESChangesinAllowancesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNetForeignCurrencyLossesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNetForeignCurrencyLossesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNetForeignCurrencyLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_amt_ForeigncurrencytransactiongainlossinAOCIandIncomeStatement_e84f0f9c-b096-4883-a09d-a986fe3b02c4" xlink:href="amt-20201231.xsd#amt_ForeigncurrencytransactiongainlossinAOCIandIncomeStatement"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_ForeigncurrencytransactiongainlossreclassifiedasAOCI_92a7df41-1e3a-4f2c-9c2d-466f779f0275" xlink:href="amt-20201231.xsd#amt_ForeigncurrencytransactiongainlossreclassifiedasAOCI"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_ForeigncurrencytransactiongainlossinAOCIandIncomeStatement_e84f0f9c-b096-4883-a09d-a986fe3b02c4" xlink:to="loc_amt_ForeigncurrencytransactiongainlossreclassifiedasAOCI_92a7df41-1e3a-4f2c-9c2d-466f779f0275" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_5f46c29a-bf64-448c-aa1c-8faaf322b0e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_ForeigncurrencytransactiongainlossinAOCIandIncomeStatement_e84f0f9c-b096-4883-a09d-a986fe3b02c4" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_5f46c29a-bf64-448c-aa1c-8faaf322b0e6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESCashCashEquivalentsAndRestrictedCashDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESCashCashEquivalentsAndRestrictedCashDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESCashCashEquivalentsAndRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_cc5a8eb2-4129-4f3d-809a-b561b45a0afd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_d17e5c4f-2f20-4294-b8a6-9d55a55cc689" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_cc5a8eb2-4129-4f3d-809a-b561b45a0afd" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_d17e5c4f-2f20-4294-b8a6-9d55a55cc689" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_41a748ee-b56d-43d5-ae95-70d1f4b7a941" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_cc5a8eb2-4129-4f3d-809a-b561b45a0afd" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_41a748ee-b56d-43d5-ae95-70d1f4b7a941" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPropertyandEquipmentDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPropertyandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPropertyandEquipmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESGoodwillandOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESGoodwillandOtherIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESGoodwillandOtherIntangibleAssetsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESOtherComprehensiveIncomeLossDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESOtherComprehensiveIncomeLossDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRevenueNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDisaggregationofRevenueDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_1e9e2874-aaa1-4ce4-8917-dd94114bcbda" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_90e2266a-ccc5-4253-a26f-992642bbefb3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_1e9e2874-aaa1-4ce4-8917-dd94114bcbda" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_90e2266a-ccc5-4253-a26f-992642bbefb3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_449eaf43-568c-4d67-ae76-d7d7d949255d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_1e9e2874-aaa1-4ce4-8917-dd94114bcbda" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_449eaf43-568c-4d67-ae76-d7d7d949255d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofNonleaseRecievablesContractAssetsandLiabilitiesFromContractswithTenantsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofNonleaseRecievablesContractAssetsandLiabilitiesFromContractswithTenantsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofNonleaseRecievablesContractAssetsandLiabilitiesFromContractswithTenantsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRentExpenseDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRentExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRentExpenseDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESStockBasedCompensationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESStockBasedCompensationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESStockBasedCompensationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRetirementPlanDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRetirementPlanDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESRetirementPlanDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETS" xlink:type="simple" xlink:href="amt-20201231.xsd#PREPAIDANDOTHERCURRENTASSETS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#PREPAIDANDOTHERCURRENTASSETSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETSDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#PREPAIDANDOTHERCURRENTASSETSDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_815a2eb0-b5a5-4477-9907-d52a4fb27b3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_a55833bb-7f59-4a29-8a2e-a77b1aa8f99d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_815a2eb0-b5a5-4477-9907-d52a4fb27b3c" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_a55833bb-7f59-4a29-8a2e-a77b1aa8f99d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidTaxes_52a6210c-7979-449d-a0e0-28fc4c4907e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_815a2eb0-b5a5-4477-9907-d52a4fb27b3c" xlink:to="loc_us-gaap_PrepaidTaxes_52a6210c-7979-449d-a0e0-28fc4c4907e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledReceivablesCurrent_360a10a6-dde3-4e66-90d2-ebd0cf32620a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnbilledReceivablesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_815a2eb0-b5a5-4477-9907-d52a4fb27b3c" xlink:to="loc_us-gaap_UnbilledReceivablesCurrent_360a10a6-dde3-4e66-90d2-ebd0cf32620a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueAddedTaxReceivable_0a9deb7a-3c0d-4672-806a-14acd5f9b664" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValueAddedTaxReceivable"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_815a2eb0-b5a5-4477-9907-d52a4fb27b3c" xlink:to="loc_us-gaap_ValueAddedTaxReceivable_0a9deb7a-3c0d-4672-806a-14acd5f9b664" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousCurrent_5cdf1587-4bf4-4700-a56e-ef8d7c8fb3e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMiscellaneousCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_815a2eb0-b5a5-4477-9907-d52a4fb27b3c" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousCurrent_5cdf1587-4bf4-4700-a56e-ef8d7c8fb3e9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/PROPERTYANDEQUIPMENT" xlink:type="simple" xlink:href="amt-20201231.xsd#PROPERTYANDEQUIPMENT"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PROPERTYANDEQUIPMENT" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/PROPERTYANDEQUIPMENTTables" xlink:type="simple" xlink:href="amt-20201231.xsd#PROPERTYANDEQUIPMENTTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PROPERTYANDEQUIPMENTTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/PROPERTYANDEQUIPMENTSummaryofPropertyandEquipmentIncludingFinanceLeaseRightofUseAssetsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#PROPERTYANDEQUIPMENTSummaryofPropertyandEquipmentIncludingFinanceLeaseRightofUseAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PROPERTYANDEQUIPMENTSummaryofPropertyandEquipmentIncludingFinanceLeaseRightofUseAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_70d996a2-c8e3-438f-a5cc-3a4df22f23bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_c38e6c6c-c675-4310-aa31-f40274dd06cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_70d996a2-c8e3-438f-a5cc-3a4df22f23bd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_c38e6c6c-c675-4310-aa31-f40274dd06cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_0d0e7b4f-3105-4566-9fc9-b464bb11b63f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_70d996a2-c8e3-438f-a5cc-3a4df22f23bd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_0d0e7b4f-3105-4566-9fc9-b464bb11b63f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/PROPERTYANDEQUIPMENTNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#PROPERTYANDEQUIPMENTNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PROPERTYANDEQUIPMENTNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/PROPERTYANDEQUIPMENTScheduleofFinanceLeaseAssetsIncludedinPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#PROPERTYANDEQUIPMENTScheduleofFinanceLeaseAssetsIncludedinPropertyPlantandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/PROPERTYANDEQUIPMENTScheduleofFinanceLeaseAssetsIncludedinPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_187d95a4-f881-451f-96b5-54f506b9fee6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_FinanceLeaseRightofUseAssetGross_ce22f5fa-cc7b-4f66-a6d4-cf1ef6630d14" xlink:href="amt-20201231.xsd#amt_FinanceLeaseRightofUseAssetGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAsset_187d95a4-f881-451f-96b5-54f506b9fee6" xlink:to="loc_amt_FinanceLeaseRightofUseAssetGross_ce22f5fa-cc7b-4f66-a6d4-cf1ef6630d14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_FinanceLeaseAccumulatedDepreciationDepletionandAmortization_cf224677-26bc-400b-93dc-1ec6a406aeea" xlink:href="amt-20201231.xsd#amt_FinanceLeaseAccumulatedDepreciationDepletionandAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAsset_187d95a4-f881-451f-96b5-54f506b9fee6" xlink:to="loc_amt_FinanceLeaseAccumulatedDepreciationDepletionandAmortization_cf224677-26bc-400b-93dc-1ec6a406aeea" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASES" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESTables" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESFutureMinimumRentalReceiptsExpectedUnderOperatingLeasesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESFutureMinimumRentalReceiptsExpectedUnderOperatingLeasesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESFutureMinimumRentalReceiptsExpectedUnderOperatingLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_599162cd-6f76-4f96-a6a2-f46b661c53c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_599162cd-6f76-4f96-a6a2-f46b661c53c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_e7798b9f-7f2b-436c-b19f-74c4b56703a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_e7798b9f-7f2b-436c-b19f-74c4b56703a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_68bb9788-8050-4ca3-802f-a3fd3de72f70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_68bb9788-8050-4ca3-802f-a3fd3de72f70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_c9f37be7-4146-46b8-bbcc-c269295d4ffb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_c9f37be7-4146-46b8-bbcc-c269295d4ffb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_ba2b9d24-1f8b-48fa-9da3-3b86c18895fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_ba2b9d24-1f8b-48fa-9da3-3b86c18895fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_c82edc18-b1a1-4add-b166-1c3679ec87a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_75987fdb-a26f-4cce-89d0-8529de5fa747" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_c82edc18-b1a1-4add-b166-1c3679ec87a9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESInformationAboutOtherLeaserelatedBalancesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESInformationAboutOtherLeaserelatedBalancesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESInformationAboutOtherLeaserelatedBalancesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESScheduleOfWeightedAverageLeaseTermsAndDiscountRatesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESScheduleOfWeightedAverageLeaseTermsAndDiscountRatesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESScheduleOfWeightedAverageLeaseTermsAndDiscountRatesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESLeaseCostsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESLeaseCostsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESLeaseCostsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESSupplementalCashFlowInformationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESSupplementalCashFlowInformationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESSupplementalCashFlowInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESMaturitiesOfOperatingAndFinanceLeasesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESMaturitiesOfOperatingAndFinanceLeasesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESMaturitiesOfOperatingAndFinanceLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_c29641d9-5532-43ce-8f2d-fed34e4bbfce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_aadd164c-82b9-45fb-946c-ad8054e6d0f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_c29641d9-5532-43ce-8f2d-fed34e4bbfce" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_aadd164c-82b9-45fb-946c-ad8054e6d0f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_76d6e148-5181-4846-b396-27b8542c4086" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_c29641d9-5532-43ce-8f2d-fed34e4bbfce" xlink:to="loc_us-gaap_FinanceLeaseLiability_76d6e148-5181-4846-b396-27b8542c4086" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_c0afa12d-3f6d-42b5-8f36-89196cd0e3d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_bceeba3d-6fdb-4081-8ae9-7ac12a16b7c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_c0afa12d-3f6d-42b5-8f36-89196cd0e3d6" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_bceeba3d-6fdb-4081-8ae9-7ac12a16b7c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_bf15b3ce-36ed-4638-9427-0aad2241e141" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_c0afa12d-3f6d-42b5-8f36-89196cd0e3d6" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_bf15b3ce-36ed-4638-9427-0aad2241e141" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_009abbd2-2101-428f-bce4-4cdd0ef8344f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_a710fdb0-94cf-42e5-ba39-f7d4cf52041b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_009abbd2-2101-428f-bce4-4cdd0ef8344f" xlink:to="loc_us-gaap_OperatingLeaseLiability_a710fdb0-94cf-42e5-ba39-f7d4cf52041b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_d68cd994-fdbe-4fca-9784-0bfa1aa02638" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_009abbd2-2101-428f-bce4-4cdd0ef8344f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_d68cd994-fdbe-4fca-9784-0bfa1aa02638" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_dafc272f-b0b0-4257-977b-f82dd1f54721" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_bd48a103-75be-4bdf-b4d4-0921a6f28d28" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiability_dafc272f-b0b0-4257-977b-f82dd1f54721" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_bd48a103-75be-4bdf-b4d4-0921a6f28d28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_fcf5a692-cfb4-41bb-b0a0-f93ba7688781" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiability_dafc272f-b0b0-4257-977b-f82dd1f54721" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_fcf5a692-cfb4-41bb-b0a0-f93ba7688781" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/LEASESMaturitiesOfOperatingAndFinanceLeasesDetails_1" xlink:type="simple" xlink:href="amt-20201231.xsd#LEASESMaturitiesOfOperatingAndFinanceLeasesDetails_1"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LEASESMaturitiesOfOperatingAndFinanceLeasesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_1bb69769-239e-453d-813b-997ea54dc7cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_1bb69769-239e-453d-813b-997ea54dc7cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_309164b7-b0b9-44c1-95b2-f389f25a88d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_309164b7-b0b9-44c1-95b2-f389f25a88d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_8c67e0f6-309b-4f44-826f-d24cd9a440dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_8c67e0f6-309b-4f44-826f-d24cd9a440dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_646c5bbf-521d-4966-91c7-db9ff84bcf21" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_646c5bbf-521d-4966-91c7-db9ff84bcf21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_f14fd6c6-a8c4-4d0e-b8b1-689f983034b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_f14fd6c6-a8c4-4d0e-b8b1-689f983034b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_cfd31c69-353e-477b-8b8f-db566be6e14e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_23d4b98e-9b39-4d7c-b6eb-90de562e69a7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_cfd31c69-353e-477b-8b8f-db566be6e14e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_c23c934c-ab41-47c6-adb1-8a7e061d37f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_c23c934c-ab41-47c6-adb1-8a7e061d37f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_e11a5a29-17fb-4978-b91b-94e50b5560e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_e11a5a29-17fb-4978-b91b-94e50b5560e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_1db94e4a-cd8d-4140-9a82-a0b73b96127e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_1db94e4a-cd8d-4140-9a82-a0b73b96127e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_cd592420-42f3-4202-92a9-b85b816767c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_cd592420-42f3-4202-92a9-b85b816767c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_d20434c3-3a97-4223-8516-bff11067be69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_d20434c3-3a97-4223-8516-bff11067be69" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_3320578e-3d28-4b49-a972-448609d6caa1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f2097472-c55a-4493-b23c-00d49e26d671" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_3320578e-3d28-4b49-a972-448609d6caa1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETS" xlink:type="simple" xlink:href="amt-20201231.xsd#GOODWILLANDOTHERINTANGIBLEASSETS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#GOODWILLANDOTHERINTANGIBLEASSETSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSChangesInTheCarryingValueOfGoodwillDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#GOODWILLANDOTHERINTANGIBLEASSETSChangesInTheCarryingValueOfGoodwillDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSChangesInTheCarryingValueOfGoodwillDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangibleAssetsSubjectToAmortizationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangibleAssetsSubjectToAmortizationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangibleAssetsSubjectToAmortizationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_60c8f6b5-5417-46aa-a9a0-b3e1ba0ca783" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_15b5906e-0cab-4337-83bb-9db453e83f53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_60c8f6b5-5417-46aa-a9a0-b3e1ba0ca783" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_15b5906e-0cab-4337-83bb-9db453e83f53" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_69623836-a925-426e-8421-3ec4e42e9f4b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_60c8f6b5-5417-46aa-a9a0-b3e1ba0ca783" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_69623836-a925-426e-8421-3ec4e42e9f4b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSExpectedFutureAmortizationExpensesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#GOODWILLANDOTHERINTANGIBLEASSETSExpectedFutureAmortizationExpensesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSExpectedFutureAmortizationExpensesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/NOTESRECEIVABLEANDOTHERNONCURRENTASSETS" xlink:type="simple" xlink:href="amt-20201231.xsd#NOTESRECEIVABLEANDOTHERNONCURRENTASSETS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/NOTESRECEIVABLEANDOTHERNONCURRENTASSETS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/NOTESRECEIVABLEANDOTHERNONCURRENTASSETSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#NOTESRECEIVABLEANDOTHERNONCURRENTASSETSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/NOTESRECEIVABLEANDOTHERNONCURRENTASSETSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/NOTESRECEIVABLEANDOTHERNONCURRENTASSETSDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#NOTESRECEIVABLEANDOTHERNONCURRENTASSETSDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/NOTESRECEIVABLEANDOTHERNONCURRENTASSETSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_044dec94-34e0-4d09-ae31-7ac8723666fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent_46a9eb56-4c2e-4830-a50e-438086765a9a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_044dec94-34e0-4d09-ae31-7ac8723666fe" xlink:to="loc_us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent_46a9eb56-4c2e-4830-a50e-438086765a9a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_c3e13ed5-29e2-43fc-ab8c-adfd39f0d99b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_044dec94-34e0-4d09-ae31-7ac8723666fe" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_c3e13ed5-29e2-43fc-ab8c-adfd39f0d99b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/ACQUISITIONS" xlink:type="simple" xlink:href="amt-20201231.xsd#ACQUISITIONS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACQUISITIONS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACQUISITIONSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#ACQUISITIONSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACQUISITIONSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACQUISITIONSMergerandIntegrationExpensesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ACQUISITIONSMergerandIntegrationExpensesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACQUISITIONSMergerandIntegrationExpensesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACQUISITIONSNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ACQUISITIONSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACQUISITIONSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACQUISITIONSScheduleofAllocationofPurchaseandtheAmountofAssetsAcquiredDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ACQUISITIONSScheduleofAllocationofPurchaseandtheAmountofAssetsAcquiredDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACQUISITIONSScheduleofAllocationofPurchaseandtheAmountofAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_c1983b83-9ad8-4ae1-a5de-2d350f58c5da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_c1983b83-9ad8-4ae1-a5de-2d350f58c5da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_a6d6a138-d0ee-4e96-93d9-75dcf161a9ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_a6d6a138-d0ee-4e96-93d9-75dcf161a9ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_9570da2f-867b-43a3-89e7-92e1b5e9bad4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_9570da2f-867b-43a3-89e7-92e1b5e9bad4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_1dd42064-ef9f-459e-98fb-37b7779e68ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_1dd42064-ef9f-459e-98fb-37b7779e68ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_b1388f55-a671-4cf6-8678-ade8272abe35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_b1388f55-a671-4cf6-8678-ade8272abe35" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_aba3c8a6-3fba-4fd4-b5fb-e0c1646efb54" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_aba3c8a6-3fba-4fd4-b5fb-e0c1646efb54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_c141d4ed-16ab-43e5-91d9-0814ad43c38b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_20fc8572-ab53-455b-9ee3-47d7309e69b1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_c141d4ed-16ab-43e5-91d9-0814ad43c38b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_74b4e40d-86a9-4c51-9693-53f545be2872" xlink:href="amt-20201231.xsd#amt_AssetCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_68fe0aea-5b6a-4f3d-a000-b7b49ac92094" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_74b4e40d-86a9-4c51-9693-53f545be2872" xlink:to="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_68fe0aea-5b6a-4f3d-a000-b7b49ac92094" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionFiniteLivedIntangibleAssetsNet_8d1c3ff0-a7e6-489c-abca-026a940e7e63" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionFiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionFiniteLivedIntangibleAssetsNet_8d1c3ff0-a7e6-489c-abca-026a940e7e63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionOtherAssetsNonCurrent_f3ac0a81-2744-47e1-9420-9c59737908a1" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionOtherAssetsNonCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionOtherAssetsNonCurrent_f3ac0a81-2744-47e1-9420-9c59737908a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionAssetsCurrent_c6ed90ea-4601-430a-b568-8cb40225629c" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionAssetsCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionAssetsCurrent_c6ed90ea-4601-430a-b568-8cb40225629c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionPropertyPlantAndEquipmentNet_51ebdde6-222f-46f6-ae2c-45ccaff779c6" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionPropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionPropertyPlantAndEquipmentNet_51ebdde6-222f-46f6-ae2c-45ccaff779c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionOtherLiabilitiesNoncurrent_1e0416aa-6ee6-4f06-82cf-889849967772" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionOtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionOtherLiabilitiesNoncurrent_1e0416aa-6ee6-4f06-82cf-889849967772" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionLiabilitiesCurrent_5294a134-513d-40e9-917a-7d1fe6d3b54d" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionLiabilitiesCurrent"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionLiabilitiesCurrent_5294a134-513d-40e9-917a-7d1fe6d3b54d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AssetAcquisitionDeferredIncomeTaxLiabilitiesNet_23d08f3e-1070-467a-b901-431afc66cd47" xlink:href="amt-20201231.xsd#amt_AssetAcquisitionDeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_AssetAcquisitionAssetsAcquiredAndLiabilitiesAssumedNet_fa3dd5e1-977a-462c-a5e5-bb287ec0114e" xlink:to="loc_amt_AssetAcquisitionDeferredIncomeTaxLiabilitiesNet_23d08f3e-1070-467a-b901-431afc66cd47" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_c145f718-c3b6-4436-97b6-e4c577c4d696" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_a07a5c71-7478-4bd2-ace5-d290dca09f24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_c145f718-c3b6-4436-97b6-e4c577c4d696" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_a07a5c71-7478-4bd2-ace5-d290dca09f24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_f0090941-a0f1-4af6-a6b3-a1ebd2cc1241" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_c145f718-c3b6-4436-97b6-e4c577c4d696" xlink:to="loc_us-gaap_Goodwill_f0090941-a0f1-4af6-a6b3-a1ebd2cc1241" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/ACQUISITIONSProFormaInformationUnauditedDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ACQUISITIONSProFormaInformationUnauditedDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACQUISITIONSProFormaInformationUnauditedDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACCRUEDEXPENSES" xlink:type="simple" xlink:href="amt-20201231.xsd#ACCRUEDEXPENSES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACCRUEDEXPENSES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACCRUEDEXPENSESTables" xlink:type="simple" xlink:href="amt-20201231.xsd#ACCRUEDEXPENSESTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACCRUEDEXPENSESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ACCRUEDEXPENSESDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ACCRUEDEXPENSESDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ACCRUEDEXPENSESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AccruedPropertyAndRealEstateTaxes_ac29fd49-cc22-42fb-9875-40cbe29a92f6" xlink:href="amt-20201231.xsd#amt_AccruedPropertyAndRealEstateTaxes"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_amt_AccruedPropertyAndRealEstateTaxes_ac29fd49-cc22-42fb-9875-40cbe29a92f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AccruedPassThroughCosts_cdbe9a49-19fb-48ad-a444-3d970cae250e" xlink:href="amt-20201231.xsd#amt_AccruedPassThroughCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_amt_AccruedPassThroughCosts_cdbe9a49-19fb-48ad-a444-3d970cae250e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PayablesToCustomers_64f0cd3a-13cd-43ea-9495-91e182bb1087" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_PayablesToCustomers"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_srt_PayablesToCustomers_64f0cd3a-13cd-43ea-9495-91e182bb1087" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedRentCurrent_db9b007c-7488-4ded-a60d-17620f8776ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedRentCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_us-gaap_AccruedRentCurrent_db9b007c-7488-4ded-a60d-17620f8776ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_be951cb5-acab-4ecc-a2cc-bc89122ccf8d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_be951cb5-acab-4ecc-a2cc-bc89122ccf8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionPayableCurrent_f35ff955-91a1-4e2a-90eb-c596e4798299" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionPayableCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_us-gaap_ConstructionPayableCurrent_f35ff955-91a1-4e2a-90eb-c596e4798299" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_8542474c-ebc4-4eb9-ae11-abdd7fee2ade" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_8542474c-ebc4-4eb9-ae11-abdd7fee2ade" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_94f4c5f6-61b5-4382-ac2a-aa5ebad7a480" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_94f4c5f6-61b5-4382-ac2a-aa5ebad7a480" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_AcquisitionsPayable_903ab0f3-708b-4a24-9252-369d5ddf5139" xlink:href="amt-20201231.xsd#amt_AcquisitionsPayable"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_eb626b63-8275-46f7-99b8-1a1eac6cfc10" xlink:to="loc_amt_AcquisitionsPayable_903ab0f3-708b-4a24-9252-369d5ddf5139" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONS" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofOutstandingAmountsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSScheduleofOutstandingAmountsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofOutstandingAmountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_3ae71ca9-ccdc-4c95-ab4e-986dddf65582" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_aa03495a-647d-40d1-9fc8-341fc6a59e7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_3ae71ca9-ccdc-4c95-ab4e-986dddf65582" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_aa03495a-647d-40d1-9fc8-341fc6a59e7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_2c132f43-a9b4-424f-89e8-969dffff88b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_3ae71ca9-ccdc-4c95-ab4e-986dddf65582" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_2c132f43-a9b4-424f-89e8-969dffff88b3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofOutstandingAmountsDetails_1" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSScheduleofOutstandingAmountsDetails_1"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofOutstandingAmountsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_00441083-883d-4bcc-a200-fa29c488a975" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_464d6c0b-71e6-40a0-9cde-691a70ca73fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_00441083-883d-4bcc-a200-fa29c488a975" xlink:to="loc_us-gaap_FinanceLeaseLiability_464d6c0b-71e6-40a0-9cde-691a70ca73fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_f2be1bba-a7e3-48f7-9fb3-056f22277b76" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_00441083-883d-4bcc-a200-fa29c488a975" xlink:to="loc_us-gaap_LongTermDebt_f2be1bba-a7e3-48f7-9fb3-056f22277b76" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSCurrentPortionofDebtandBankFacilitiesNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSCurrentPortionofDebtandBankFacilitiesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSCurrentPortionofDebtandBankFacilitiesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofCreditFacilitiesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSScheduleofCreditFacilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofCreditFacilitiesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMDebtOBLIGATIONSSeniorNotesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMDebtOBLIGATIONSSeniorNotesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMDebtOBLIGATIONSSeniorNotesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSOutlineofKeyTermsRelatedtoOutstandingSeniorNotesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSOutlineofKeyTermsRelatedtoOutstandingSeniorNotesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSOutlineofKeyTermsRelatedtoOutstandingSeniorNotesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMDEBTOBLIGATIONSSubsidiaryDebtNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMDEBTOBLIGATIONSSubsidiaryDebtNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMDEBTOBLIGATIONSSubsidiaryDebtNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofIndiaIndebtednessDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSScheduleofIndiaIndebtednessDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofIndiaIndebtednessDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofOtherSubsidiaryDebtDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSScheduleofOtherSubsidiaryDebtDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofOtherSubsidiaryDebtDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSInSiteDebtNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSInSiteDebtNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSInSiteDebtNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofInSiteDebtKeyTermsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSScheduleofInSiteDebtKeyTermsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSScheduleofInSiteDebtKeyTermsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSFinanceLeaseObligationsNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSFinanceLeaseObligationsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSFinanceLeaseObligationsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSMaturitiesofLongTermDebtDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#LONGTERMOBLIGATIONSMaturitiesofLongTermDebtDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/LONGTERMOBLIGATIONSMaturitiesofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_1a4a47d2-d33a-4872-aed7-fd305775d17f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_LongTermDebtTotalCashObligations_40efa0a7-f9db-4a65-9b6d-06631b5c4cc3" xlink:href="amt-20201231.xsd#amt_LongTermDebtTotalCashObligations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_1a4a47d2-d33a-4872-aed7-fd305775d17f" xlink:to="loc_amt_LongTermDebtTotalCashObligations_40efa0a7-f9db-4a65-9b6d-06631b5c4cc3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_8f135315-39ac-452a-aa0f-84cc2ede2779" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_1a4a47d2-d33a-4872-aed7-fd305775d17f" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_8f135315-39ac-452a-aa0f-84cc2ede2779" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:href="amt-20201231.xsd#amt_LongTermDebtTotalCashObligations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_61f4c301-345b-4ba9-8c3c-c8208aa57e50" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_61f4c301-345b-4ba9-8c3c-c8208aa57e50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_25ba219f-8920-4896-967e-ef6b9b6a0c77" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_25ba219f-8920-4896-967e-ef6b9b6a0c77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_e15ddaca-65b9-405e-8746-ea7613bb9f7b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_e15ddaca-65b9-405e-8746-ea7613bb9f7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_e589720f-0bab-4e54-9f61-0e9d5a9cf5c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_e589720f-0bab-4e54-9f61-0e9d5a9cf5c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_10f97321-415e-4628-8c53-c36f07598a3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_10f97321-415e-4628-8c53-c36f07598a3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_2e63effd-cbdd-4ca9-b2c9-4563e3243c83" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_LongTermDebtTotalCashObligations_55980223-6c32-4ad5-a2ad-7bd0ad389548" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_2e63effd-cbdd-4ca9-b2c9-4563e3243c83" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHERNONCURRENTLIABILITIES" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHERNONCURRENTLIABILITIES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHERNONCURRENTLIABILITIES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHERNONCURRENTLIABILITIESTables" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHERNONCURRENTLIABILITIESTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHERNONCURRENTLIABILITIESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHERNONCURRENTLIABILITIESDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHERNONCURRENTLIABILITIESDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHERNONCURRENTLIABILITIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_d363fa40-c18d-4e9b-a17f-0c29b270f5e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_46a19510-49c8-4711-afbb-ed05f1eedcd7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_d363fa40-c18d-4e9b-a17f-0c29b270f5e1" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_46a19510-49c8-4711-afbb-ed05f1eedcd7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_7c37e34d-31df-4dda-bf60-0f8605848886" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_d363fa40-c18d-4e9b-a17f-0c29b270f5e1" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_7c37e34d-31df-4dda-bf60-0f8605848886" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONS" xlink:type="simple" xlink:href="amt-20201231.xsd#ASSETRETIREMENTOBLIGATIONS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#ASSETRETIREMENTOBLIGATIONSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONSChangesInCarryingValueOfAssetRetirementObligationsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ASSETRETIREMENTOBLIGATIONSChangesInCarryingValueOfAssetRetirementObligationsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONSChangesInCarryingValueOfAssetRetirementObligationsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONSNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ASSETRETIREMENTOBLIGATIONSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ASSETRETIREMENTOBLIGATIONSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTS" xlink:type="simple" xlink:href="amt-20201231.xsd#FAIRVALUEMEASUREMENTS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/FAIRVALUEMEASUREMENTS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#FAIRVALUEMEASUREMENTSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSAssetsAndLiabilitiesMeasuredAtFairValueOnaRecurringBasisDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#FAIRVALUEMEASUREMENTSAssetsAndLiabilitiesMeasuredAtFairValueOnaRecurringBasisDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSAssetsAndLiabilitiesMeasuredAtFairValueOnaRecurringBasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#FAIRVALUEMEASUREMENTSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXES" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESTables" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESIncomeTaxProvisionFromContinuingOperationsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESIncomeTaxProvisionFromContinuingOperationsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESIncomeTaxProvisionFromContinuingOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_9c9f2d27-d978-42ae-b33d-00336fa1b4ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_9c9f2d27-d978-42ae-b33d-00336fa1b4ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_b7b725a6-ac10-4bdc-9680-fe8c2f08f2f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_b7b725a6-ac10-4bdc-9680-fe8c2f08f2f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_ff15be85-2ba9-4b25-aa90-3bf81ea1f47c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_ff15be85-2ba9-4b25-aa90-3bf81ea1f47c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_770601df-1b2b-4c52-976a-c7ac33ea1472" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_770601df-1b2b-4c52-976a-c7ac33ea1472" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_740cfad4-dc27-47b1-bf1e-c4136d8e32f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_740cfad4-dc27-47b1-bf1e-c4136d8e32f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_80310d66-000a-4e6e-831f-42be406477e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_acd3005a-d7a1-4066-8458-e8bdf3ab0fdd" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_80310d66-000a-4e6e-831f-42be406477e3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESReconciliationBetweenTheUSStatutoryRateAndTheEffectiveRateFromContinuingOperationsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESReconciliationBetweenTheUSStatutoryRateAndTheEffectiveRateFromContinuingOperationsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESReconciliationBetweenTheUSStatutoryRateAndTheEffectiveRateFromContinuingOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_3eb84724-a719-461f-9de9-ecd40c11eddd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_3eb84724-a719-461f-9de9-ecd40c11eddd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_TaxAdjustmentRelatedToReit_0eb60367-d17f-4d32-a461-ab3647be8f97" xlink:href="amt-20201231.xsd#amt_TaxAdjustmentRelatedToReit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_amt_TaxAdjustmentRelatedToReit_0eb60367-d17f-4d32-a461-ab3647be8f97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_2093a540-40c2-4f13-bf24-3add759fd2bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_2093a540-40c2-4f13-bf24-3add759fd2bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_ForeignWithholdingTaxes_26eab5e8-32d7-4f0c-ad5a-bd634a72e541" xlink:href="amt-20201231.xsd#amt_ForeignWithholdingTaxes"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_amt_ForeignWithholdingTaxes_26eab5e8-32d7-4f0c-ad5a-bd634a72e541" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_d313c4a8-d392-46d7-bba4-3a855ffb3365" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_d313c4a8-d392-46d7-bba4-3a855ffb3365" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_EffectiveIncomeTaxRateReconciliationMIPT_336c2a59-eebd-4b56-96c9-1b0a8afb0750" xlink:href="amt-20201231.xsd#amt_EffectiveIncomeTaxRateReconciliationMIPT"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_amt_EffectiveIncomeTaxRateReconciliationMIPT_336c2a59-eebd-4b56-96c9-1b0a8afb0750" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_EffectiveIncomeTaxRateReconciliationTaxReserves_69fb25d8-b58d-4772-a07f-338e5df9d0fc" xlink:href="amt-20201231.xsd#amt_EffectiveIncomeTaxRateReconciliationTaxReserves"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_amt_EffectiveIncomeTaxRateReconciliationTaxReserves_69fb25d8-b58d-4772-a07f-338e5df9d0fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_86762e9d-5469-4879-b826-961400cfe995" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_80a1d708-3578-41ad-ac5c-da2b3132cb8d" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_86762e9d-5469-4879-b826-961400cfe995" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESComponentsOfIncomeFromContinuingOperationsBeforeIncomeTaxesAndIncomeOnEquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESComponentsOfIncomeFromContinuingOperationsBeforeIncomeTaxesAndIncomeOnEquityMethodInvestmentsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESComponentsOfIncomeFromContinuingOperationsBeforeIncomeTaxesAndIncomeOnEquityMethodInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_998e8eb0-0078-40cd-b355-2bf277ce2748" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_2c3fc275-30e3-47c2-b800-6e6c83936af5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_998e8eb0-0078-40cd-b355-2bf277ce2748" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_2c3fc275-30e3-47c2-b800-6e6c83936af5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8f873d2d-ef73-464c-9f03-cfe92fe7ccea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_998e8eb0-0078-40cd-b355-2bf277ce2748" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_8f873d2d-ef73-464c-9f03-cfe92fe7ccea" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESComponentsOfTheNetDeferredTaxAssetAndRelatedValuationAllowanceDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESComponentsOfTheNetDeferredTaxAssetAndRelatedValuationAllowanceDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESComponentsOfTheNetDeferredTaxAssetAndRelatedValuationAllowanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_7a2870d4-9e46-4d3a-a52c-709f310cd533" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_005e2f33-e2a8-4d8a-a725-02057b1727ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_7a2870d4-9e46-4d3a-a52c-709f310cd533" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_005e2f33-e2a8-4d8a-a725-02057b1727ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxLiabilitiesAssetsGross_70789c9b-4065-464e-8b42-5cc97ada4db4" xlink:href="amt-20201231.xsd#amt_DeferredTaxLiabilitiesAssetsGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_7a2870d4-9e46-4d3a-a52c-709f310cd533" xlink:to="loc_amt_DeferredTaxLiabilitiesAssetsGross_70789c9b-4065-464e-8b42-5cc97ada4db4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:href="amt-20201231.xsd#amt_DeferredTaxLiabilitiesAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxDeferredRentNoncurrent_823fdabf-a5a0-43e3-b589-495eafe0edf0" xlink:href="amt-20201231.xsd#amt_DeferredTaxDeferredRentNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_amt_DeferredTaxDeferredRentNoncurrent_823fdabf-a5a0-43e3-b589-495eafe0edf0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_d7fc6a4f-96ae-4873-8f64-c463d2eef4da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_d7fc6a4f-96ae-4873-8f64-c463d2eef4da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxLiabilitiesRightofUseAsset_9a1161b0-b464-4ba0-82a7-0e4cd240bb4b" xlink:href="amt-20201231.xsd#amt_DeferredTaxLiabilitiesRightofUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_amt_DeferredTaxLiabilitiesRightofUseAsset_9a1161b0-b464-4ba0-82a7-0e4cd240bb4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_d4301a07-bae6-4c9e-a734-a471cee7d790" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_d4301a07-bae6-4c9e-a734-a471cee7d790" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_fb0c4876-b48b-4f78-951f-b7b17b20b36d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_fb0c4876-b48b-4f78-951f-b7b17b20b36d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances_d1783e91-20b1-4a1d-978f-dca8247dc904" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances_d1783e91-20b1-4a1d-978f-dca8247dc904" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_NetLongTermOperatingLossCarryForwards_cc5a89fe-fc01-497a-9978-d1c1a5ff03b3" xlink:href="amt-20201231.xsd#amt_NetLongTermOperatingLossCarryForwards"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_amt_NetLongTermOperatingLossCarryForwards_cc5a89fe-fc01-497a-9978-d1c1a5ff03b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses_343ad48e-d40a-4a96-8d73-aea2a07ab3d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses_343ad48e-d40a-4a96-8d73-aea2a07ab3d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_74995459-1656-4375-a5a1-6ef9174bac3e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_74995459-1656-4375-a5a1-6ef9174bac3e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxAssetNondeductibleExpenseInterestAmount_8ceda061-d47f-427b-aa99-27564a7e7515" xlink:href="amt-20201231.xsd#amt_DeferredTaxAssetNondeductibleExpenseInterestAmount"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_amt_DeferredTaxAssetNondeductibleExpenseInterestAmount_8ceda061-d47f-427b-aa99-27564a7e7515" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxLiabilityDepreciationAndAmortization_b9ef1186-3cdd-4ce0-9e00-abee03ca7d78" xlink:href="amt-20201231.xsd#amt_DeferredTaxLiabilityDepreciationAndAmortization"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_amt_DeferredTaxLiabilityDepreciationAndAmortization_b9ef1186-3cdd-4ce0-9e00-abee03ca7d78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DeferredTaxAssetsOperatingLeaseLiability_5dab4bab-2580-4cda-ac19-b1569d60f483" xlink:href="amt-20201231.xsd#amt_DeferredTaxAssetsOperatingLeaseLiability"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_amt_DeferredTaxAssetsOperatingLeaseLiability_5dab4bab-2580-4cda-ac19-b1569d60f483" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates_f3d4ce75-d06c-4c75-a97f-520627235ff8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates_f3d4ce75-d06c-4c75-a97f-520627235ff8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations_9b14ecb0-e47b-4ee9-9ef5-41c3388f425a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_DeferredTaxLiabilitiesAssetsGross_853e005f-7f81-4b29-9b2e-46b8a51fb679" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations_9b14ecb0-e47b-4ee9-9ef5-41c3388f425a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESValuationAllowanceActivityDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESValuationAllowanceActivityDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESValuationAllowanceActivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESNetOperatingLossCarryforwardsExpireDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESNetOperatingLossCarryforwardsExpireDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESNetOperatingLossCarryforwardsExpireDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_38af34d4-ef3f-43b4-8194-da988f4dc514" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_NetOperatingLossCarryforwardsExpiringYearsOneThroughFive_a9a9b9e0-5331-46c1-9e3e-bcf150d51822" xlink:href="amt-20201231.xsd#amt_NetOperatingLossCarryforwardsExpiringYearsOneThroughFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLossCarryforwards_38af34d4-ef3f-43b4-8194-da988f4dc514" xlink:to="loc_amt_NetOperatingLossCarryforwardsExpiringYearsOneThroughFive_a9a9b9e0-5331-46c1-9e3e-bcf150d51822" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_NetOperatingLossCarryforwardsExpiringYearsSixThroughTen_e87c43fc-eb13-474b-bc41-062de3c46298" xlink:href="amt-20201231.xsd#amt_NetOperatingLossCarryforwardsExpiringYearsSixThroughTen"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLossCarryforwards_38af34d4-ef3f-43b4-8194-da988f4dc514" xlink:to="loc_amt_NetOperatingLossCarryforwardsExpiringYearsSixThroughTen_e87c43fc-eb13-474b-bc41-062de3c46298" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_NetOperatingLossCarryforwardsExpiringYearsElevenThroughFifteen_54cff0bf-d02c-4d5b-8f0c-5a754b341dd1" xlink:href="amt-20201231.xsd#amt_NetOperatingLossCarryforwardsExpiringYearsElevenThroughFifteen"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLossCarryforwards_38af34d4-ef3f-43b4-8194-da988f4dc514" xlink:to="loc_amt_NetOperatingLossCarryforwardsExpiringYearsElevenThroughFifteen_54cff0bf-d02c-4d5b-8f0c-5a754b341dd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_NetOperatingLossCarryforwardsExpiringYearsSixteenThroughTwenty_59b9e2ae-af36-4797-b5fe-42371670048e" xlink:href="amt-20201231.xsd#amt_NetOperatingLossCarryforwardsExpiringYearsSixteenThroughTwenty"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLossCarryforwards_38af34d4-ef3f-43b4-8194-da988f4dc514" xlink:to="loc_amt_NetOperatingLossCarryforwardsExpiringYearsSixteenThroughTwenty_59b9e2ae-af36-4797-b5fe-42371670048e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_IndefiniteCarryforward_062543b7-3b0a-424b-bf25-59a637e2ee11" xlink:href="amt-20201231.xsd#amt_IndefiniteCarryforward"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLossCarryforwards_38af34d4-ef3f-43b4-8194-da988f4dc514" xlink:to="loc_amt_IndefiniteCarryforward_062543b7-3b0a-424b-bf25-59a637e2ee11" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/INCOMETAXESReconciliationOfTheBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#INCOMETAXESReconciliationOfTheBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/INCOMETAXESReconciliationOfTheBeginningAndEndingAmountOfUnrecognizedTaxBenefitsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATION" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATION"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATION" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONTables" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATIONTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATIONNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryOfStockbasedCompensationExpensesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATIONSummaryOfStockbasedCompensationExpensesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryOfStockbasedCompensationExpensesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryOfTheCompanysOptionActivityDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATIONSummaryOfTheCompanysOptionActivityDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryOfTheCompanysOptionActivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONScheduleOfOptionsOutstandingDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATIONScheduleOfOptionsOutstandingDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONScheduleOfOptionsOutstandingDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryOfRestrictedStockActivityDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#STOCKBASEDCOMPENSATIONSummaryOfRestrictedStockActivityDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryOfRestrictedStockActivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTS" xlink:type="simple" xlink:href="amt-20201231.xsd#REDEEMABLENONCONTROLLINGINTERESTS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#REDEEMABLENONCONTROLLINGINTERESTSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTSNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#REDEEMABLENONCONTROLLINGINTERESTSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTSChangesInRedeemableNoncontrollingInterestDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#REDEEMABLENONCONTROLLINGINTERESTSChangesInRedeemableNoncontrollingInterestDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/REDEEMABLENONCONTROLLINGINTERESTSChangesInRedeemableNoncontrollingInterestDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EQUITY" xlink:type="simple" xlink:href="amt-20201231.xsd#EQUITY"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EQUITY" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EQUITYTables" xlink:type="simple" xlink:href="amt-20201231.xsd#EQUITYTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EQUITYTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EQUITYNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#EQUITYNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EQUITYNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EQUITYDistributionsDeclaredDetail" xlink:type="simple" xlink:href="amt-20201231.xsd#EQUITYDistributionsDeclaredDetail"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EQUITYDistributionsDeclaredDetail" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHEROPERATINGEXPENSES" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHEROPERATINGEXPENSES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHEROPERATINGEXPENSES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHEROPERATINGEXPENSESTables" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHEROPERATINGEXPENSESTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHEROPERATINGEXPENSESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHEROPERATINGEXPENSESDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHEROPERATINGEXPENSESDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHEROPERATINGEXPENSESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_69c19e0c-1333-4ce2-8e09-dc254320ccf8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_7731b93b-9ac4-40c4-a502-1d809d8f7505" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCostAndExpenseOperating_69c19e0c-1333-4ce2-8e09-dc254320ccf8" xlink:to="loc_us-gaap_AssetImpairmentCharges_7731b93b-9ac4-40c4-a502-1d809d8f7505" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_43bbd08c-248a-4cdf-982d-42aa244c8d0b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfOtherAssets"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCostAndExpenseOperating_69c19e0c-1333-4ce2-8e09-dc254320ccf8" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherAssets_43bbd08c-248a-4cdf-982d-42aa244c8d0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_OtherOperatingExpenses_625fe5fe-7c69-4c37-911b-1cf8db285880" xlink:href="amt-20201231.xsd#amt_OtherOperatingExpenses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCostAndExpenseOperating_69c19e0c-1333-4ce2-8e09-dc254320ccf8" xlink:to="loc_amt_OtherOperatingExpenses_625fe5fe-7c69-4c37-911b-1cf8db285880" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/OTHEROPERATINGEXPENSESImpairmentChargesDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#OTHEROPERATINGEXPENSESImpairmentChargesDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/OTHEROPERATINGEXPENSESImpairmentChargesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHARE" xlink:type="simple" xlink:href="amt-20201231.xsd#EARNINGSPERCOMMONSHARE"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EARNINGSPERCOMMONSHARE" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHARETables" xlink:type="simple" xlink:href="amt-20201231.xsd#EARNINGSPERCOMMONSHARETables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EARNINGSPERCOMMONSHARETables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHAREScheduleOfEarningsPerBasicAndDilutedByCommonClassDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#EARNINGSPERCOMMONSHAREScheduleOfEarningsPerBasicAndDilutedByCommonClassDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EARNINGSPERCOMMONSHAREScheduleOfEarningsPerBasicAndDilutedByCommonClassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_0492dbdd-4ea5-420b-82e1-04d215f30add" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4e34789d-892f-4e5a-9531-4f61d533cca5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_0492dbdd-4ea5-420b-82e1-04d215f30add" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4e34789d-892f-4e5a-9531-4f61d533cca5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_c238812a-0c28-4df9-a1e1-efdca936fa7e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_0492dbdd-4ea5-420b-82e1-04d215f30add" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_c238812a-0c28-4df9-a1e1-efdca936fa7e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHAREScheduleOfSharesExcludedFromComputationOfEarningsPerShareDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#EARNINGSPERCOMMONSHAREScheduleOfSharesExcludedFromComputationOfEarningsPerShareDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/EARNINGSPERCOMMONSHAREScheduleOfSharesExcludedFromComputationOfEarningsPerShareDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/COMMITMENTSANDCONTINGENCIES" xlink:type="simple" xlink:href="amt-20201231.xsd#COMMITMENTSANDCONTINGENCIES"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/COMMITMENTSANDCONTINGENCIES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#COMMITMENTSANDCONTINGENCIESNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/SUPPLEMENTALCASHFLOWINFORMATION" xlink:type="simple" xlink:href="amt-20201231.xsd#SUPPLEMENTALCASHFLOWINFORMATION"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/SUPPLEMENTALCASHFLOWINFORMATION" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/SUPPLEMENTALCASHFLOWINFORMATIONTables" xlink:type="simple" xlink:href="amt-20201231.xsd#SUPPLEMENTALCASHFLOWINFORMATIONTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/SUPPLEMENTALCASHFLOWINFORMATIONTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/SUPPLEMENTALCASHFLOWINFORMATIONDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#SUPPLEMENTALCASHFLOWINFORMATIONDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/SUPPLEMENTALCASHFLOWINFORMATIONDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTS" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSTables" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTSTables"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSNarrativeDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSSummarizedSegmentFinancialInformationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTSSummarizedSegmentFinancialInformationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTSSummarizedSegmentFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_amt_SegmentOperatingProfit_06e3d060-0d2a-4d7f-8e8e-43935f85c859" xlink:href="amt-20201231.xsd#amt_SegmentOperatingProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_SegmentReportingSegmentGrossProfit_992e982a-ac15-4586-8f0b-b2b5dfe32c7d" xlink:href="amt-20201231.xsd#amt_SegmentReportingSegmentGrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_SegmentOperatingProfit_06e3d060-0d2a-4d7f-8e8e-43935f85c859" xlink:to="loc_amt_SegmentReportingSegmentGrossProfit_992e982a-ac15-4586-8f0b-b2b5dfe32c7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_SegmentSellingGeneralAdministrationAndDevelopmentExpenses_fd3469cb-bf9f-4503-b122-f69bda3567e4" xlink:href="amt-20201231.xsd#amt_SegmentSellingGeneralAdministrationAndDevelopmentExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_SegmentOperatingProfit_06e3d060-0d2a-4d7f-8e8e-43935f85c859" xlink:to="loc_amt_SegmentSellingGeneralAdministrationAndDevelopmentExpenses_fd3469cb-bf9f-4503-b122-f69bda3567e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_SegmentReportingSegmentGrossProfit_35a84a47-f92a-4049-b2f3-33dd694ddeb2" xlink:href="amt-20201231.xsd#amt_SegmentReportingSegmentGrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_7253bcfd-2719-42f9-bf3f-5fcea5212177" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_SegmentReportingSegmentGrossProfit_35a84a47-f92a-4049-b2f3-33dd694ddeb2" xlink:to="loc_us-gaap_Revenues_7253bcfd-2719-42f9-bf3f-5fcea5212177" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_SegmentOperatingExpenses_85f93b18-adf6-46dd-a4c1-5bb29a3abe39" xlink:href="amt-20201231.xsd#amt_SegmentOperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_SegmentReportingSegmentGrossProfit_35a84a47-f92a-4049-b2f3-33dd694ddeb2" xlink:to="loc_amt_SegmentOperatingExpenses_85f93b18-adf6-46dd-a4c1-5bb29a3abe39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_ce919fb4-e139-45ff-8526-645e0c888b63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_SegmentReportingSegmentGrossProfit_35a84a47-f92a-4049-b2f3-33dd694ddeb2" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_ce919fb4-e139-45ff-8526-645e0c888b63" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSAdditionalInformationRelatingtotheCompanysOperatingSegmentsDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTSAdditionalInformationRelatingtotheCompanysOperatingSegmentsDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTSAdditionalInformationRelatingtotheCompanysOperatingSegmentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSSummaryofGeographicInformationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTSSummaryofGeographicInformationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTSSummaryofGeographicInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSMajorCustomersDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#BUSINESSSEGMENTSMajorCustomersDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/BUSINESSSEGMENTSMajorCustomersDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/RELATEDPARTYTRANSACTIONS" xlink:type="simple" xlink:href="amt-20201231.xsd#RELATEDPARTYTRANSACTIONS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/RELATEDPARTYTRANSACTIONS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/SUBSEQUENTEVENTS" xlink:type="simple" xlink:href="amt-20201231.xsd#SUBSEQUENTEVENTS"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/SUBSEQUENTEVENTS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/SUBSEQUENTEVENTSDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#SUBSEQUENTEVENTSDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/SUBSEQUENTEVENTSDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATION" xlink:type="simple" xlink:href="amt-20201231.xsd#ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATION"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATION" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.americantower.com/role/ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATIONScheduleofRealEstateandAccumulatedDepreciationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATIONScheduleofRealEstateandAccumulatedDepreciationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATIONScheduleofRealEstateandAccumulatedDepreciationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_amt_RealEstatePeriodAdditionsToAccumulatedDepreciation_8e97d55e-d905-457b-9ae2-7a74f14e9663" xlink:href="amt-20201231.xsd#amt_RealEstatePeriodAdditionsToAccumulatedDepreciation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciationOtherAdditions_a3ce121f-0151-41fc-bb15-8e6bb58abeab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateAccumulatedDepreciationOtherAdditions"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToAccumulatedDepreciation_8e97d55e-d905-457b-9ae2-7a74f14e9663" xlink:to="loc_us-gaap_RealEstateAccumulatedDepreciationOtherAdditions_a3ce121f-0151-41fc-bb15-8e6bb58abeab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense_5bee42cd-0944-4fa9-807f-bee97988980d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToAccumulatedDepreciation_8e97d55e-d905-457b-9ae2-7a74f14e9663" xlink:to="loc_us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense_5bee42cd-0944-4fa9-807f-bee97988980d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.americantower.com/role/ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATIONActivityofrealEstateandAccumulatedDepreciationDetails" xlink:type="simple" xlink:href="amt-20201231.xsd#ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATIONActivityofrealEstateandAccumulatedDepreciationDetails"/>
  <link:calculationLink xlink:role="http://www.americantower.com/role/ScheduleIIISCHEDULEOFREALESTATEANDACCUMULATEDDEPRECIATIONActivityofrealEstateandAccumulatedDepreciationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:href="amt-20201231.xsd#amt_RealEstatePeriodAdditionsToCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherAcquisitions_f5a8eae1-7aff-4813-948c-7b3761c959e0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateOtherAcquisitions"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_us-gaap_RealEstateOtherAcquisitions_f5a8eae1-7aff-4813-948c-7b3761c959e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DiscretionaryCapitalProjects_4369238a-5f72-40a6-a8d5-a07a6c069b59" xlink:href="amt-20201231.xsd#amt_DiscretionaryCapitalProjects"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_amt_DiscretionaryCapitalProjects_4369238a-5f72-40a6-a8d5-a07a6c069b59" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_StartUpCapitalExpenditures_d74ac9f6-6def-44ad-97ee-4451d51de63d" xlink:href="amt-20201231.xsd#amt_StartUpCapitalExpenditures"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_amt_StartUpCapitalExpenditures_d74ac9f6-6def-44ad-97ee-4451d51de63d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateImprovements_0c9f2eff-5eb9-461d-88ec-7dc5cc66a7f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateImprovements"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_us-gaap_RealEstateImprovements_0c9f2eff-5eb9-461d-88ec-7dc5cc66a7f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_DiscretionaryGroundLeasePurchases_6a3bb123-644d-4782-bdda-b775197eb48e" xlink:href="amt-20201231.xsd#amt_DiscretionaryGroundLeasePurchases"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_amt_DiscretionaryGroundLeasePurchases_6a3bb123-644d-4782-bdda-b775197eb48e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherAdditions_b673d956-7ac7-40a4-8160-d39226f358b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateOtherAdditions"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_us-gaap_RealEstateOtherAdditions_b673d956-7ac7-40a4-8160-d39226f358b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_RedevelopmentCapitalExpenditures_fa7752d3-a058-4373-a6a3-2dd427926b0b" xlink:href="amt-20201231.xsd#amt_RedevelopmentCapitalExpenditures"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodAdditionsToCost_e9ab4d6b-c93f-466f-8ca7-afdfa59943dd" xlink:to="loc_amt_RedevelopmentCapitalExpenditures_fa7752d3-a058-4373-a6a3-2dd427926b0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_RealEstatePeriodDeductionsToAccumulatedDepreciation_cc2d49d8-d0b4-4315-be56-3235121c1731" xlink:href="amt-20201231.xsd#amt_RealEstatePeriodDeductionsToAccumulatedDepreciation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold_d1e2ed7f-a5ba-44fc-94c5-1b7a1e6d38c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateAccumulatedDepreciationRealEstateSold"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodDeductionsToAccumulatedDepreciation_cc2d49d8-d0b4-4315-be56-3235121c1731" xlink:to="loc_us-gaap_RealEstateAccumulatedDepreciationRealEstateSold_d1e2ed7f-a5ba-44fc-94c5-1b7a1e6d38c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions_6368c8d2-fe7d-483e-b4bd-18d62a3af55d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateAccumulatedDepreciationOtherDeductions"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodDeductionsToAccumulatedDepreciation_cc2d49d8-d0b4-4315-be56-3235121c1731" xlink:to="loc_us-gaap_RealEstateAccumulatedDepreciationOtherDeductions_6368c8d2-fe7d-483e-b4bd-18d62a3af55d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_amt_RealEstatePeriodDeductionsToCost_1c63fc89-022f-46d5-805c-662e6869a21e" xlink:href="amt-20201231.xsd#amt_RealEstatePeriodDeductionsToCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateCostOfRealEstateSold_fff55a10-e2e6-4164-b18d-a41427ec60f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateCostOfRealEstateSold"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodDeductionsToCost_1c63fc89-022f-46d5-805c-662e6869a21e" xlink:to="loc_us-gaap_RealEstateCostOfRealEstateSold_fff55a10-e2e6-4164-b18d-a41427ec60f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherDeductions_a1cd04b3-27bd-4309-bddf-73bcbf077a90" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateOtherDeductions"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_amt_RealEstatePeriodDeductionsToCost_1c63fc89-022f-46d5-805c-662e6869a21e" xlink:to="loc_us-gaap_RealEstateOtherDeductions_a1cd04b3-27bd-4309-bddf-73bcbf077a90" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
