The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. This Microsoft Excel template illustrates how to create a loan amortization schedule, as well as dealing with additional payments and variable interest rates.You can create an Excel amortization table with changing interest rates. Here's how you can build it. This calculator will help you figure out your regular loan payments and it will also create a detailed schedule of payments. How to calculate personal loan interest. Check out the web's best free mortgage calculator to save money on your home loan today. Loan Amortization Schedule. This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments. Even better is to set aside a separate set of columns and input your main loan variables (e.g.