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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:655d1a33-8903-4cd4-98d0-e0b96dff7d55,g:801e9a17-b5a3-4488-b883-55abf8125806-->
<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://momentus.space/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="mnts-20220930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://momentus.space/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_2df25e39-7e3a-4f99-99b3-4a5cb709401d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_9caadade-a343-43f6-a3fa-a8549d6d14f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_2df25e39-7e3a-4f99-99b3-4a5cb709401d" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_9caadade-a343-43f6-a3fa-a8549d6d14f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_11cb8259-2fbe-4d5d-9367-21e7523834cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_2df25e39-7e3a-4f99-99b3-4a5cb709401d" xlink:to="loc_us-gaap_LiabilitiesCurrent_11cb8259-2fbe-4d5d-9367-21e7523834cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_d2f2cb18-89f2-4911-845a-f3fe86e10cae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_59466292-677c-489e-a66d-73458aa6c40f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_LiabilitiesAndStockholdersEquity_d2f2cb18-89f2-4911-845a-f3fe86e10cae" xlink:to="loc_us-gaap_StockholdersEquity_59466292-677c-489e-a66d-73458aa6c40f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_869e8e20-35bc-4be2-b213-fe8410d0c1c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_d2f2cb18-89f2-4911-845a-f3fe86e10cae" xlink:to="loc_us-gaap_CommitmentsAndContingencies_869e8e20-35bc-4be2-b213-fe8410d0c1c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_e93e0246-1dad-45e9-83ad-3fe7768101e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d2f2cb18-89f2-4911-845a-f3fe86e10cae" xlink:to="loc_us-gaap_Liabilities_e93e0246-1dad-45e9-83ad-3fe7768101e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_67120c9a-073f-4e0b-8e3b-93c0d822ae6d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_399dea5a-c189-4c1c-bb09-cc6ba1a99280" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_67120c9a-073f-4e0b-8e3b-93c0d822ae6d" xlink:to="loc_us-gaap_CommonStockValue_399dea5a-c189-4c1c-bb09-cc6ba1a99280" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7912dba1-4e3e-4a3e-ac80-388844981da9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_67120c9a-073f-4e0b-8e3b-93c0d822ae6d" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7912dba1-4e3e-4a3e-ac80-388844981da9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_dd5ea19d-9c18-496f-a893-1f8215e8231f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_67120c9a-073f-4e0b-8e3b-93c0d822ae6d" xlink:to="loc_us-gaap_AdditionalPaidInCapital_dd5ea19d-9c18-496f-a893-1f8215e8231f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_a7fcab1f-6621-413f-b033-30ae5fe108f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_842f1095-c2b4-4cbe-9868-8c37452a5f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_a7fcab1f-6621-413f-b033-30ae5fe108f6" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_842f1095-c2b4-4cbe-9868-8c37452a5f0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_9966a77e-4307-453f-b919-009310c1ea6d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_a7fcab1f-6621-413f-b033-30ae5fe108f6" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_9966a77e-4307-453f-b919-009310c1ea6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_13a15cc6-7776-485b-ada7-1aa5720b606a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_a7fcab1f-6621-413f-b033-30ae5fe108f6" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_13a15cc6-7776-485b-ada7-1aa5720b606a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_90289a81-2e79-4577-8e58-5277f7721185" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WarrantsAndRightsOutstanding"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_a7fcab1f-6621-413f-b033-30ae5fe108f6" xlink:to="loc_us-gaap_WarrantsAndRightsOutstanding_90289a81-2e79-4577-8e58-5277f7721185" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermLoansPayable_1cbaa542-643a-4f63-a596-78bd6bb37946" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermLoansPayable"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_a7fcab1f-6621-413f-b033-30ae5fe108f6" xlink:to="loc_us-gaap_LongTermLoansPayable_1cbaa542-643a-4f63-a596-78bd6bb37946" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_b5bd0469-74bb-41c8-a9bb-2682ca0a794c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_8cc5f45c-899e-44da-a175-4cd9a35f5199" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_b5bd0469-74bb-41c8-a9bb-2682ca0a794c" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_8cc5f45c-899e-44da-a175-4cd9a35f5199" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7d0209b3-96fb-44fc-a330-ad5c937d814d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_b5bd0469-74bb-41c8-a9bb-2682ca0a794c" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7d0209b3-96fb-44fc-a330-ad5c937d814d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_53b50c2c-db9e-4c2d-91a7-2322b8c25b13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_b5bd0469-74bb-41c8-a9bb-2682ca0a794c" xlink:to="loc_us-gaap_RestrictedCashCurrent_53b50c2c-db9e-4c2d-91a7-2322b8c25b13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4416eb2d-1717-4a9f-b434-3afaed707a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_4416eb2d-1717-4a9f-b434-3afaed707a8c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_6f9423d6-a838-4c6e-8b07-ba7ddcf2b5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_6f9423d6-a838-4c6e-8b07-ba7ddcf2b5a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_77cb3ab2-254b-4f32-9a22-332fc33c20d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_77cb3ab2-254b-4f32-9a22-332fc33c20d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d14778b6-c137-44e3-9685-0538d4dec953" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d14778b6-c137-44e3-9685-0538d4dec953" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_800c3828-e76c-4a2b-bac0-47ff29bef57e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_800c3828-e76c-4a2b-bac0-47ff29bef57e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_b9d2f45b-dec1-4ad9-889d-77fabff7e9df" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_AssetsCurrent_b9d2f45b-dec1-4ad9-889d-77fabff7e9df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCosts_1a1c5ea6-38cc-450a-9fa1-2088a56887ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCosts"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_64c0a53c-8452-45b3-8810-eee54c328368" xlink:to="loc_us-gaap_DeferredCosts_1a1c5ea6-38cc-450a-9fa1-2088a56887ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_1c5f1f4c-c010-437c-a9db-7d9c27faaa1f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_1c5f1f4c-c010-437c-a9db-7d9c27faaa1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableCurrent_6a6ae820-3597-4b78-a930-d2e32df2ed73" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_us-gaap_LoansPayableCurrent_6a6ae820-3597-4b78-a930-d2e32df2ed73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_17350ef9-eb75-47f5-a020-be39f93b3b81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_us-gaap_AccountsPayableCurrent_17350ef9-eb75-47f5-a020-be39f93b3b81" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_1e4135e6-9465-419b-bd7f-c3b4149f9f54" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_1e4135e6-9465-419b-bd7f-c3b4149f9f54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_ShareRepurchaseLiabilityCurrent_3103a28c-4443-4058-9e79-ac4b85691b16" xlink:href="mnts-20220930.xsd#mnts_ShareRepurchaseLiabilityCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_mnts_ShareRepurchaseLiabilityCurrent_3103a28c-4443-4058-9e79-ac4b85691b16" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_ea74e367-292a-4834-9363-ec922e31a67a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_ea74e367-292a-4834-9363-ec922e31a67a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_112106a0-ded0-4fe2-8578-a2d4182699ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_266d14d1-09fe-4cd2-9534-3951a6dda4db" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_112106a0-ded0-4fe2-8578-a2d4182699ed" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="mnts-20220930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://momentus.space/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc80132-63a0-4ba7-92d4-40c15c5a8560" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_8dd382ab-b3f5-494f-aba1-d9243c230c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc80132-63a0-4ba7-92d4-40c15c5a8560" xlink:to="loc_us-gaap_OperatingIncomeLoss_8dd382ab-b3f5-494f-aba1-d9243c230c0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_825159ab-cfcd-483e-b016-f43da89525fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc80132-63a0-4ba7-92d4-40c15c5a8560" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_825159ab-cfcd-483e-b016-f43da89525fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_1b45868f-324e-4128-9f14-ce26026db790" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_d73a95cd-d126-436f-8ae5-da29f44f773a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_1b45868f-324e-4128-9f14-ce26026db790" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_d73a95cd-d126-436f-8ae5-da29f44f773a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_0b38e977-d422-4c57-b301-0bee055bd77f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_1b45868f-324e-4128-9f14-ce26026db790" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_0b38e977-d422-4c57-b301-0bee055bd77f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_27730b18-3654-4a75-9365-21b7651211ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_60262ae5-be4c-4019-960c-0cafe2290da2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_27730b18-3654-4a75-9365-21b7651211ca" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_60262ae5-be4c-4019-960c-0cafe2290da2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c17c540-a5f1-4423-8529-c5f0f78384ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_27730b18-3654-4a75-9365-21b7651211ca" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c17c540-a5f1-4423-8529-c5f0f78384ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_7d257dc9-9b43-4c2d-92c0-fb8ddb6a8550" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_19b15f80-00b7-4507-8928-4e632ddd52ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_7d257dc9-9b43-4c2d-92c0-fb8ddb6a8550" xlink:to="loc_us-gaap_OperatingExpenses_19b15f80-00b7-4507-8928-4e632ddd52ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_d1a3fe6c-711d-4735-9283-89b122ad9e93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_7d257dc9-9b43-4c2d-92c0-fb8ddb6a8550" xlink:to="loc_us-gaap_GrossProfit_d1a3fe6c-711d-4735-9283-89b122ad9e93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_172887e1-1aa8-41bd-8114-cb396142e0bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_172887e1-1aa8-41bd-8114-cb396142e0bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_34449d4d-9634-4e3b-a833-4db2ea7c36f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_us-gaap_InterestExpense_34449d4d-9634-4e3b-a833-4db2ea7c36f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_5c028435-cf90-4246-bd5f-ae9057713f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_us-gaap_InvestmentIncomeInterest_5c028435-cf90-4246-bd5f-ae9057713f5f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_ecd48899-41e6-4a3a-99aa-10f8ca480e6f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_ecd48899-41e6-4a3a-99aa-10f8ca480e6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_FairValueAdjustmentToFinancialInstrumentsSubjectToMandatoryRedemption_88ce7b77-0f75-4174-a243-20884fccb484" xlink:href="mnts-20220930.xsd#mnts_FairValueAdjustmentToFinancialInstrumentsSubjectToMandatoryRedemption"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_mnts_FairValueAdjustmentToFinancialInstrumentsSubjectToMandatoryRedemption_88ce7b77-0f75-4174-a243-20884fccb484" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_4269cc3e-61d9-4d8d-aa12-e0b80f999308" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_4269cc3e-61d9-4d8d-aa12-e0b80f999308" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_42cbc6d1-b666-471f-aad2-f5a0c7ce6553" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_2f3a8c9d-0af3-4028-85fd-93b86bdee10d" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_42cbc6d1-b666-471f-aad2-f5a0c7ce6553" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_39fb6641-c88d-4f2e-8bbb-5aa07b07aa16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_fea18712-c4e1-406b-bcd5-f135e94ce361" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_39fb6641-c88d-4f2e-8bbb-5aa07b07aa16" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_fea18712-c4e1-406b-bcd5-f135e94ce361" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_77ce0474-2ca8-4ba6-b0af-66c877b07965" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_39fb6641-c88d-4f2e-8bbb-5aa07b07aa16" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_77ce0474-2ca8-4ba6-b0af-66c877b07965" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="mnts-20220930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://momentus.space/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ccd30856-4b0c-458d-a842-1d013e02791e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_886460ed-7577-45b8-bb1f-39663f99e387" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ccd30856-4b0c-458d-a842-1d013e02791e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_886460ed-7577-45b8-bb1f-39663f99e387" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c8786f19-2b09-47d6-bc38-15ef1468e47d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_ccd30856-4b0c-458d-a842-1d013e02791e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c8786f19-2b09-47d6-bc38-15ef1468e47d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1142e25d-5292-4354-8877-0ef68936cf06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ccd30856-4b0c-458d-a842-1d013e02791e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1142e25d-5292-4354-8877-0ef68936cf06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromShortTermDebt_1559fddf-6d81-4370-9699-080063ee2a9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromShortTermDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_ProceedsFromShortTermDebt_1559fddf-6d81-4370-9699-080063ee2a9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_PaymentOfWarrantIssuanceCosts_ee1ee06d-9861-470c-add1-a0b16fc88c46" xlink:href="mnts-20220930.xsd#mnts_PaymentOfWarrantIssuanceCosts"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_mnts_PaymentOfWarrantIssuanceCosts_ee1ee06d-9861-470c-add1-a0b16fc88c46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_PaymentsOfStockIssuanceCostsRelatedToPrivatePlacement_caec0ad9-4c07-4b3b-ba5d-8c4d640d0efb" xlink:href="mnts-20220930.xsd#mnts_PaymentsOfStockIssuanceCostsRelatedToPrivatePlacement"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_mnts_PaymentsOfStockIssuanceCostsRelatedToPrivatePlacement_caec0ad9-4c07-4b3b-ba5d-8c4d640d0efb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_b0f9220e-0c73-4e58-8ccb-838823285b95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_b0f9220e-0c73-4e58-8ccb-838823285b95" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_cbc39c1c-ff65-49de-95bd-2e2adad6d1f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_cbc39c1c-ff65-49de-95bd-2e2adad6d1f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfNotesPayable_c73fb82e-ec90-4b61-bc19-6049ae1b6a5c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfNotesPayable"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_RepaymentsOfNotesPayable_c73fb82e-ec90-4b61-bc19-6049ae1b6a5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_0041e5a1-9f7c-4992-967f-d4e6d6a49598" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_0041e5a1-9f7c-4992-967f-d4e6d6a49598" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_b5493e35-82a1-41f3-beeb-ea042e5c6f78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_b5493e35-82a1-41f3-beeb-ea042e5c6f78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_ProceedsFromIssuanceOfFinancialInstrumentsSubjectToMandatoryRedemption_6faaf51c-4de1-4b52-9a2b-0f7681bdb861" xlink:href="mnts-20220930.xsd#mnts_ProceedsFromIssuanceOfFinancialInstrumentsSubjectToMandatoryRedemption"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_mnts_ProceedsFromIssuanceOfFinancialInstrumentsSubjectToMandatoryRedemption_6faaf51c-4de1-4b52-9a2b-0f7681bdb861" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_7be71841-d7e5-43f0-a89b-5d904fc07a5b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_7be71841-d7e5-43f0-a89b-5d904fc07a5b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentOfLoansByEmployeeStockOwnershipPlans_c926e5b8-4f3e-462c-acf8-00808227c54a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromRepaymentOfLoansByEmployeeStockOwnershipPlans"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_ProceedsFromRepaymentOfLoansByEmployeeStockOwnershipPlans_c926e5b8-4f3e-462c-acf8-00808227c54a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_481144d0-ec8b-41ec-8c18-3f775bd1ced1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_481144d0-ec8b-41ec-8c18-3f775bd1ced1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_a12f0eb3-e0f7-42bf-8cfa-f06afa94a16f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_fbb0dbd5-76e0-4789-a07a-4283be00de1e" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_a12f0eb3-e0f7-42bf-8cfa-f06afa94a16f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4732078e-2e64-401d-8cab-fe6787e9364b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_718c7585-c505-4e1e-b21d-22e788868e97" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_4732078e-2e64-401d-8cab-fe6787e9364b" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_718c7585-c505-4e1e-b21d-22e788868e97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_1cde35f1-d774-4b50-9d4c-b1bfd555c246" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4732078e-2e64-401d-8cab-fe6787e9364b" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_1cde35f1-d774-4b50-9d4c-b1bfd555c246" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_75432007-662a-4383-a240-fc3ce996734b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4732078e-2e64-401d-8cab-fe6787e9364b" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_75432007-662a-4383-a240-fc3ce996734b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_511781b0-8d72-4f46-b089-e2f77c9b8aaf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_511781b0-8d72-4f46-b089-e2f77c9b8aaf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_408e61fa-1e8a-40de-9b76-1d4ff5766152" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_408e61fa-1e8a-40de-9b76-1d4ff5766152" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_a38c6d8d-d5b5-4f78-b9cb-5f077e356e24" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_a38c6d8d-d5b5-4f78-b9cb-5f077e356e24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_7970841e-8ccf-4b48-bdcf-e3c7fa0882f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_7970841e-8ccf-4b48-bdcf-e3c7fa0882f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_1a397425-4fcd-496f-9c80-c4dec9702aba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_1a397425-4fcd-496f-9c80-c4dec9702aba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_04baccf1-4918-4c60-9642-fe6da8871ebb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_04baccf1-4918-4c60-9642-fe6da8871ebb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_54a3bd0b-1bf4-4ed7-9539-f3e4e9f35c23" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_ShareBasedCompensation_54a3bd0b-1bf4-4ed7-9539-f3e4e9f35c23" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_PrepaidLaunchCostsImpairmentCharges_0b2ed844-543c-493f-87b0-9fadd3197993" xlink:href="mnts-20220930.xsd#mnts_PrepaidLaunchCostsImpairmentCharges"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_mnts_PrepaidLaunchCostsImpairmentCharges_0b2ed844-543c-493f-87b0-9fadd3197993" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_40fc9730-b5f2-45bb-a48a-2b9b30353d07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_40fc9730-b5f2-45bb-a48a-2b9b30353d07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_b5899666-6c6f-4d61-9ee8-e6b88f5f39d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_b5899666-6c6f-4d61-9ee8-e6b88f5f39d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_4967b677-71ab-4d7b-bf71-140f9acffe80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_4967b677-71ab-4d7b-bf71-140f9acffe80" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_457069c6-52fa-4950-93ff-3e8ebde3df9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_457069c6-52fa-4950-93ff-3e8ebde3df9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_b0792f31-1b40-42f5-869d-e880c67bdc6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_b0792f31-1b40-42f5-869d-e880c67bdc6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_55c38d6f-ae64-4b83-8230-d7020e3f45ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_NetIncomeLoss_55c38d6f-ae64-4b83-8230-d7020e3f45ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_fba264a2-3bfb-40cb-bc3f-3de9bd578b64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_fba264a2-3bfb-40cb-bc3f-3de9bd578b64" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_542c268c-2487-4ed4-b256-6d8d43a6cfdf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_542c268c-2487-4ed4-b256-6d8d43a6cfdf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_FairValueAdjustmentOfFinancialInstrumentsSubjectToMandatoryRedemption_ba4468bc-226f-41ad-9449-b10acd47b55d" xlink:href="mnts-20220930.xsd#mnts_FairValueAdjustmentOfFinancialInstrumentsSubjectToMandatoryRedemption"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_mnts_FairValueAdjustmentOfFinancialInstrumentsSubjectToMandatoryRedemption_ba4468bc-226f-41ad-9449-b10acd47b55d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDepreciationAndAmortization_2aa881e2-3aa2-4b14-a1a8-a582d9a37e42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherDepreciationAndAmortization"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6bcd9e60-2926-46df-ac89-5521d43e5872" xlink:to="loc_us-gaap_OtherDepreciationAndAmortization_2aa881e2-3aa2-4b14-a1a8-a582d9a37e42" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/PrepaidsandOtherCurrentAssetsDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#PrepaidsandOtherCurrentAssetsDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/PrepaidsandOtherCurrentAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_3ae9ec7a-9c2a-478f-9754-4b27d721d97c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_PrepaidLaunchCostsCurrent_b89876cb-10e5-4b1a-a9bb-90b693c1e619" xlink:href="mnts-20220930.xsd#mnts_PrepaidLaunchCostsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_3ae9ec7a-9c2a-478f-9754-4b27d721d97c" xlink:to="loc_mnts_PrepaidLaunchCostsCurrent_b89876cb-10e5-4b1a-a9bb-90b693c1e619" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_PrepaidInsuranceAndOtherAssetsCurrent_59f4a4a0-2811-4149-9a89-bbd707907a57" xlink:href="mnts-20220930.xsd#mnts_PrepaidInsuranceAndOtherAssetsCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_3ae9ec7a-9c2a-478f-9754-4b27d721d97c" xlink:to="loc_mnts_PrepaidInsuranceAndOtherAssetsCurrent_59f4a4a0-2811-4149-9a89-bbd707907a57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_PrepaidResearchAndDevelopmentExpenseCurrent_da60239c-b09e-463f-af8a-b56aea46c032" xlink:href="mnts-20220930.xsd#mnts_PrepaidResearchAndDevelopmentExpenseCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_3ae9ec7a-9c2a-478f-9754-4b27d721d97c" xlink:to="loc_mnts_PrepaidResearchAndDevelopmentExpenseCurrent_da60239c-b09e-463f-af8a-b56aea46c032" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/PropertyMachineryandEquipmentnetDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#PropertyMachineryandEquipmentnetDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/PropertyMachineryandEquipmentnetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_e038a6c1-ab56-43f0-b1d0-2f0c9f8ba228" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_f3ead0bd-bb60-49cd-8f5a-cb4ca35890d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_e038a6c1-ab56-43f0-b1d0-2f0c9f8ba228" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_f3ead0bd-bb60-49cd-8f5a-cb4ca35890d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_50630e76-ccbb-43d4-a64b-161288cade55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_e038a6c1-ab56-43f0-b1d0-2f0c9f8ba228" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_50630e76-ccbb-43d4-a64b-161288cade55" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/IntangibleAssetsnetScheduleofIntangibleAssetsNetDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#IntangibleAssetsnetScheduleofIntangibleAssetsNetDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/IntangibleAssetsnetScheduleofIntangibleAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_10f22e87-8bd4-4155-b286-905061cd5c2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_6854fcd7-2eb8-40c2-a84b-6f0adbc7cf0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_10f22e87-8bd4-4155-b286-905061cd5c2a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_6854fcd7-2eb8-40c2-a84b-6f0adbc7cf0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_4f121457-cabc-4a7d-b6a9-4a14f8de6297" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_10f22e87-8bd4-4155-b286-905061cd5c2a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_4f121457-cabc-4a7d-b6a9-4a14f8de6297" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/IntangibleAssetsnetScheduleofFutureEstimatedAmortizationExpenseDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#IntangibleAssetsnetScheduleofFutureEstimatedAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/IntangibleAssetsnetScheduleofFutureEstimatedAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_9d075ef6-e122-4f04-bd1d-236e1f57216e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_9d075ef6-e122-4f04-bd1d-236e1f57216e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_ead0667c-7ff5-4f4c-90c1-3dfb807b5071" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_ead0667c-7ff5-4f4c-90c1-3dfb807b5071" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_abb9837d-1fe7-454c-a424-d715852f774b" xlink:href="mnts-20220930.xsd#mnts_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:to="loc_mnts_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour_abb9837d-1fe7-454c-a424-d715852f774b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_6a0f1569-4e3c-4fb6-ba09-7aa3af6767a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_6a0f1569-4e3c-4fb6-ba09-7aa3af6767a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_198b1050-cbd7-4f3d-ac5f-426a482b54a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_198b1050-cbd7-4f3d-ac5f-426a482b54a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_8b9e8577-d347-418c-af6d-957efd1dbcd7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_072b59f0-1c6a-4a5c-904e-528271288daf" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_8b9e8577-d347-418c-af6d-957efd1dbcd7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/LeasesComponentsofOperatingLeaseExpenseDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#LeasesComponentsofOperatingLeaseExpenseDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/LeasesComponentsofOperatingLeaseExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_0838beca-e5bc-4cbb-996b-a1ef29dfb245" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_7671f4af-d617-4c11-b12b-b72b90757dc9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_0838beca-e5bc-4cbb-996b-a1ef29dfb245" xlink:to="loc_us-gaap_ShortTermLeaseCost_7671f4af-d617-4c11-b12b-b72b90757dc9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_34f219cb-f0f7-4e84-9c0c-0e47966b0aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_0838beca-e5bc-4cbb-996b-a1ef29dfb245" xlink:to="loc_us-gaap_OperatingLeaseCost_34f219cb-f0f7-4e84-9c0c-0e47966b0aa6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_3c7ce602-407d-43bc-b4bf-ad82672a70ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_0838beca-e5bc-4cbb-996b-a1ef29dfb245" xlink:to="loc_us-gaap_VariableLeaseCost_3c7ce602-407d-43bc-b4bf-ad82672a70ba" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#LeasesMaturitiesofOperatingLeaseLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_c73f4afa-2ca1-4040-84da-274ff8d2ccbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_c73f4afa-2ca1-4040-84da-274ff8d2ccbe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_14d4c2d6-849c-4535-9e18-55293b58a466" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_14d4c2d6-849c-4535-9e18-55293b58a466" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_15d5b2d3-ba65-48f4-a8ab-f6e17a37e96a" xlink:href="mnts-20220930.xsd#mnts_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:to="loc_mnts_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_15d5b2d3-ba65-48f4-a8ab-f6e17a37e96a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_a6cc8701-696f-4986-a100-425cc19e6c71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_a6cc8701-696f-4986-a100-425cc19e6c71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_090001fd-15e5-4eff-8181-2de57aaf77c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_090001fd-15e5-4eff-8181-2de57aaf77c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8f199f2e-aa81-42ea-8ffd-319a5dc65e28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_96a80b4c-56c8-4ff8-8c98-1902306e6484" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8f199f2e-aa81-42ea-8ffd-319a5dc65e28" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1" xlink:type="simple" xlink:href="mnts-20220930.xsd#LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1"/>
  <link:calculationLink xlink:role="http://momentus.space/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_31b4e96b-eb83-44b8-a83e-e1e3fa576522" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_7d0e5118-bb91-4d26-884c-18e73daf5382" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_31b4e96b-eb83-44b8-a83e-e1e3fa576522" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_7d0e5118-bb91-4d26-884c-18e73daf5382" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_2ab3bdf9-9dc1-4061-b085-afb706173e7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_31b4e96b-eb83-44b8-a83e-e1e3fa576522" xlink:to="loc_us-gaap_OperatingLeaseLiability_2ab3bdf9-9dc1-4061-b085-afb706173e7d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/AccruedExpensesDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#AccruedExpensesDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/AccruedExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedProfessionalFeesCurrent_ce24f720-5fa4-4983-b14f-654f5450eb70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedProfessionalFeesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:to="loc_us-gaap_AccruedProfessionalFeesCurrent_ce24f720-5fa4-4983-b14f-654f5450eb70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedSalariesCurrent_51fdc92f-dd14-4cdc-a3de-66c09964b380" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedSalariesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:to="loc_us-gaap_AccruedSalariesCurrent_51fdc92f-dd14-4cdc-a3de-66c09964b380" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_AccruedResearchAndDevelopmentExpensesCurrent_30864191-af79-4c61-9e73-8f7d66ea9bd3" xlink:href="mnts-20220930.xsd#mnts_AccruedResearchAndDevelopmentExpensesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:to="loc_mnts_AccruedResearchAndDevelopmentExpensesCurrent_30864191-af79-4c61-9e73-8f7d66ea9bd3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_b14ae6f4-7386-4d43-b6b4-5010ca44f2cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_b14ae6f4-7386-4d43-b6b4-5010ca44f2cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedPayrollTaxesCurrent_37db6185-b861-418d-8c41-5ac169fbbe7e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedPayrollTaxesCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:to="loc_us-gaap_AccruedPayrollTaxesCurrent_37db6185-b861-418d-8c41-5ac169fbbe7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_AccruedOfferingCostsCurrent_fb24bcd1-eabc-47f5-a537-9850bd5c32a2" xlink:href="mnts-20220930.xsd#mnts_AccruedOfferingCostsCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_1d2df348-6444-4290-b2e4-37df01091ebe" xlink:to="loc_mnts_AccruedOfferingCostsCurrent_fb24bcd1-eabc-47f5-a537-9850bd5c32a2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/StockholdersEquityDeficitandStockbasedCompensationScheduleofNetLossIncomePerShareDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#StockholdersEquityDeficitandStockbasedCompensationScheduleofNetLossIncomePerShareDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/StockholdersEquityDeficitandStockbasedCompensationScheduleofNetLossIncomePerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_e619a28f-077d-41ba-b263-c13683621b9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e74244f2-c514-41bb-aa45-0ca5de3d672b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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_NetIncomeLossAvailableToCommonStockholdersDiluted_e619a28f-077d-41ba-b263-c13683621b9b" xlink:to="loc_us-gaap_NetIncomeLoss_e74244f2-c514-41bb-aa45-0ca5de3d672b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3dbef61c-32a7-4676-b9cf-1610a61bf230" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_3bf0da9a-ba6f-412b-bc61-44ffbe1d71a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3dbef61c-32a7-4676-b9cf-1610a61bf230" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_3bf0da9a-ba6f-412b-bc61-44ffbe1d71a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_def1bf8f-2665-4568-8338-608a04fb6619" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3dbef61c-32a7-4676-b9cf-1610a61bf230" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_def1bf8f-2665-4568-8338-608a04fb6619" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants_22625d06-708e-4ee4-8c45-b2c1067ea6e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3dbef61c-32a7-4676-b9cf-1610a61bf230" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants_22625d06-708e-4ee4-8c45-b2c1067ea6e1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://momentus.space/role/CommitmentandContingenciesUnconditionalPurchaseObligationsDetails" xlink:type="simple" xlink:href="mnts-20220930.xsd#CommitmentandContingenciesUnconditionalPurchaseObligationsDetails"/>
  <link:calculationLink xlink:role="http://momentus.space/role/CommitmentandContingenciesUnconditionalPurchaseObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_906e178f-b915-44f2-b47f-f07add15d2ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary_d18eeb67-2c6e-4bc0-9fb8-18e902596bd0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_906e178f-b915-44f2-b47f-f07add15d2ec" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary_d18eeb67-2c6e-4bc0-9fb8-18e902596bd0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary_47a8fe8e-5c62-4db4-8cf3-daa88e5dd4e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_906e178f-b915-44f2-b47f-f07add15d2ec" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary_47a8fe8e-5c62-4db4-8cf3-daa88e5dd4e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear_f368ca66-0fa5-48a9-a81b-81bbab252aae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_906e178f-b915-44f2-b47f-f07add15d2ec" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear_f368ca66-0fa5-48a9-a81b-81bbab252aae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mnts_UnrecordedUnconditionalPurchaseObligationToBePaidAfterYearThree_58daa083-a4c3-4e57-a7bf-616b97990d90" xlink:href="mnts-20220930.xsd#mnts_UnrecordedUnconditionalPurchaseObligationToBePaidAfterYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_906e178f-b915-44f2-b47f-f07add15d2ec" xlink:to="loc_mnts_UnrecordedUnconditionalPurchaseObligationToBePaidAfterYearThree_58daa083-a4c3-4e57-a7bf-616b97990d90" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
