The indepth Watch Me Build is a 25 minute behemoth, showing you how to build a more complex, dynamic amortization table in Excel. If you add an extra payment the calculator will show how many payments you saved off the original loan term and how many years that saved.Calculate the monthly payments, total interest, and the amount of the balloon payment for a simple loan using this Excel spreadsheet template. In this video I'm going to show you how you can use Microsoft Excel to conduct a fairly straightforward exercise in loan amortization. This amortization calculator returns monthly payment amounts as well as displays a schedule, graph, and pie chart breakdown of an amortized loan. Enter the variables for your loan. Fill in your variables in the adjacent cells to your labels. This amortization calculator returns monthly payment amounts as well as displays a schedule, graph, and pie chart breakdown of an amortized loan. Amortization is paying off a debt over time in equal installments. Part of each payment goes toward the loan principal, and part goes toward interest.