Monthly Mortgage Payment Calculator Calculate your monthly mortgage payment. Click on the "?" next to the input box for an item to get help on that item. See the impact of extra mortgage payments on your loan and create an amortization table. Mortgage amount $   (Do not use commas.) Mortgage term     years or months Interest rate      % per year Mortgage start date    Monthly mortgage payment $         Extra Payments Calculate the impact of extra mortgage payments using any combination of the inputs below Adding $ to your monthly mortgage payment Adding $ as an extra yearly mortgage payment every Adding $ as a one-time mortgage payment in Changes paid-off date to