The mortgage payoff calculator helps you find out. Use this mortgage calculator to determine your monthly payment and generate an estimated amortization schedule.Free mortgage payoff calculator to evaluate options to pay off a mortgage earlier, such as extra payments, bi-weekly payments, or paying back altogether. In this episode, we'll walk you through how to use our mortgage comparison calculator. Use SmartAsset's free Arizona mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more. Use the extra payment calculator below to help determine how advantageous it is to pay a little extra each month toward your mortgage. 1) Call the mortgage department and request an official principal payoff letter. NerdWallet's early mortgage payoff calculator figures out how much more you need to pay.