Mortgage Payoff Calculator. The mortgage payoff calculator helps you find out.Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether. Use SmartAsset's free California mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more. Use our free mortgage calculator to easily estimate your monthly payment. See which type of mortgage is right for you and how much house you can afford. Use our mortgage payment calculator to estimate future payments. Make payments weekly, bi-weekly or annually. You can submit a request in writing (using our Payoff Request Form) to CalHFA, Loan Administration, 500 Capitol Mall, Ste.