This mortgage payoff calculator helps evaluate how adding extra payments or bi-weekly payments can save on interest and shorten mortgage term. 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.This financial calculator helps you find out. Mortgage Payoff Calculator. NerdWallet's early mortgage payoff calculator figures out how much more to pay. Use this free California mortgage calculator to estimate your monthly mortgage payments and annual amortization. An online mortgage calculator can help you quickly and accurately predict your monthly mortgage payment with just a few pieces of information. There are three fields to fill in: home price, down payment and mortgage interest rate. In the dropdown box, choose your loan term. How long will it take to pay off your credit card balance?