The indepth Watch Me Build is a 25 minute behemoth, showing you how to build a more complex, dynamic amortization table in Excel. Microsoft Excel Mortgage Caculator XLS Worksheet.This amortization calculator returns monthly payment amounts as well as displays a schedule, graph, and pie chart breakdown of an amortized loan. Use our amortization calculator, type in a dollar figure under "Loan amount. How do you calculate amortization? Type the month and year of the first loan payment in cell A8. Note: The purchased version of this document includes a Loan Amortization Schedule Calculator (in Microsoft Excel format). This Microsoft Excel template illustrates how to create a loan amortization schedule, as well as dealing with additional payments and variable interest rates. Visualize your loan payments and amortization schedule with our SBA 7(a) business loan calculator.