This mortgage payoff calculator is designed to help you understand the impact of making additional payments on your mortgage. This mortgage payoff calculator helps evaluate how adding extra payments or bi-weekly payments can save on interest and shorten mortgage term.This mortgage calculator will help you estimate your monthly mortgage payments based on the home price, down payment, loan term, and interest rate. The mortgage payoff calculator helps you find out. It lays out each fee and dollar still due before you completely pay off your mortgage. Here's how it works. Use this calculator to see what it will take to pay off your credit card balance, and what you can change to meet your repayment goals. NerdWallet's early mortgage payoff calculator figures out how much more you need to pay. To use the calculator below, enter your current balance, interest rate or APR and your annual fee, if you pay one. Estimate how much money and how many months you have until you pay off your credit card balance.