Mortgage Payoff Calculator. Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether.NerdWallet's early mortgage payoff calculator figures out how much more to pay. Making extra mortgage payments can help pay off your mortgage early and save money on interest. Does prepaying make sense? 1) Call the mortgage department and request an official principal payoff letter. Your proposed extra payment amount per month. This amount will be used to further reduce your principal balance. Find out how much you could save on your mortgage with extra monthly payments. Yes, you will need to cancel any automatic payments you've set up within your Freedom Mortgage account.