Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether. The mortgage payoff calculator helps you find out.This calculator allows you to enter an initial lump-sum extra payment along with extra monthly payments which coincide with your regular monthly payments. Use the extra payment calculator below to help determine how advantageous it is to pay a little extra each month toward your mortgage. NerdWallet's early mortgage payoff calculator figures out how much more to pay. Use our free mortgage calculator to easily estimate your monthly payment. See which type of mortgage is right for you and how much house you can afford. This guide will help you learn mortgage math, allowing you to confidently calculate how much you need to pay off your mortgage. Use this mortgage calculator to calculate estimated monthly mortgage payments and rate options. To use our amortization calculator, type in a dollar figure under "Loan amount.