Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether. Mortgage Payoff Calculator.Use the extra payment calculator below to help determine how advantageous it is to pay a little extra each month toward your mortgage. Use our extra payment calculator to see the potential impact an additional payment will have on your long-term finances. NerdWallet's early mortgage payoff calculator figures out how much more to pay. This calculator allows you to enter an initial lump-sum extra payment along with extra monthly payments which coincide with your regular monthly payments. Discover how much interest you can save if you pay off your mortgage earlier with the Mortgage Payoff Calculator from Credit Union of Southern California. Use Allstate's free mortgage payoff calculator to estimate what it might cost to payoff off your mortgage early. Find out how much you need to pay off here. Discover how much interest you can save if you pay off your mortgage earlier with the Mortgage Payoff Calculator from Credit Union of Southern California.