The indepth Watch Me Build is a 25 minute behemoth, showing you how to build a more complex, dynamic amortization table in Excel. Loan Amortization Schedule outlines the interest and principal payments owed on a mortgage, including the outstanding balance.In this tutorial we're going to learn how to build a simple loan calculator application in Excel. This loan calculator creates printable loan schedules with dates. Calculate unknown payment, term, interest rate, or loan amounts. Note: this spreadsheet is for educational purposes only. 5, A fixed principal loan results in declining payments over the loan period. Amortization Period: A method of debt repayment, in which fixed payments are made on a prearranged schedule. Check out the web's best free mortgage calculator to save money on your home loan today. Make math easier with these free calculator templates.