Mortgage and Refinance Excel Project Use Excel work sheet to build two Mortgage Amortization Tables. Microsoft Excel Mortgage Caculator XLS Worksheet.Mortgage Amortization Calculator. Loan details, loan amount, interest rate, loan term (years), start date, calculate amortization schedule. These amortization schedule templates will table how much you need to pay every month based on your total loan amount and interest. Mortgage interest rate. There are three fields to fill in: home price, down payment and mortgage interest rate. In the dropdown box, choose your loan term. Our calculator shows you how this plays out in the amortization schedule. Your loan program can affect your interest rate and total monthly payments.