Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether. Enter your mortgage details here.Enter extra payment amount in relevant month rows. The mortgage payoff calculator helps you find out. Use this amortization calculator to help you determine how many months it could take to pay off your loan with or without making extra payments. NerdWallet's early mortgage payoff calculator figures out how much more you need to pay. Use the extra payment calculator below to help determine how advantageous it is to pay a little extra each month toward your mortgage. There's probably an online form. This calculator helps determine both your interest-only payments and the impact of choosing to make additional principal payments. First Citizens provides a full range of banking products and services to meet your individual or business financial needs.