This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments. The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage.Looking for a flexible free downloadable mortgage calculator built in Excel? Try this free feature-rich mortgage calculator today! Loan Amortization Schedule outlines the interest and principal payments owed on a mortgage, including the outstanding balance. This spreadsheet is an allinone home mortgage calculator. It lets you analyze a fixed or variable rate home mortgage. This calculator will help you figure out your regular loan payments and it will also create a detailed schedule of payments. During the early stages of the amortization schedule, most payments are a composite of interest loans and fees. Just convert the "daily compound interest" into "effective monthly interest".