What Prepayment Does to Your Loan This calculator takes a principal amount, interest rate, normal length of the loan, and then will compute results utilizing your choice of a either how much total a month to pay, or how long you want to pay. It also calculates for credit cards and other non-amortized lines of credit that use simple compounding of interest. Enter your loan amount: Your interest rate: % (1 to 100) Amortized Length of mortgage: Enter "0" for credit card and other non amortized lines of credit Desired Length of Loan (years):Desired Monthly Payment: This is value you want to set Show Summary OnlyShow Full Table