The tutorial shows how to build an amortization schedule in Excel to detail periodic payments on an amortizing loan or mortgage. Loan amortization schedule. 3.4, Enter values, Loan summary. Use this calculator to determine your payment or loan amount for different payment frequencies. A biweekly amortization schedule is a table that details your loan payments every two weeks instead of the traditional monthly payment schedule. This spreadsheet creates an amortization schedule for a fixed-rate loan, with optional extra payments. Want to Calculate Loan Payments Offline? Excel Mortgage Calculator. Students get a hands-on way to learn how loans work in the real world. How to Make a Loan Amortization Schedule in Excel with Extra Payments?