Turner Familytree Amortization Calculator: Use this calculator to determine monthly loan payments and to show an amortization schedule. Enter the initial amount of your investment, the annual interest rate, number of years and the month and year of the first payment. Amount of Loan Annual Interest Rate Number of Years Monthly Payment Amortization Schedule No Yes First Payment January February March April May June July August September October November December It takes a few seconds to build an amortization table.