The mortgage payoff calculator helps you find out. Use this free Pennsylvania mortgage calculator to estimate your monthly mortgage payments and annual amortization.With our mortgage payment calculator, you can determine how the loan amount, interest rate, and term effect the monthly payment on your next home. It lays out each fee and dollar still due before you completely pay off your mortgage. Here's how it works. Early Mortgage Payoff Calculator. The quicker you payoff your mortgage, the less you'll pay in interest. This mortgage payoff calculator helps evaluate how adding extra payments or bi-weekly payments can save on interest and shorten mortgage term. Use SmartAsset's free mortgage calculator to estimate your monthly mortgage payments, including PMI, homeowners insurance, taxes, interest and more. Use our credit card interest calculator to help figure out your credit card payoff date and the total interest you may pay over time.