Mortgage Payment Calculator with Extra Payments

This calculator helps homeowners and real estate investors see the true impact of paying down principal faster. Enter your loan details — price, down payment, rate, and term — and the calculator instantly shows your monthly payment, total interest, and full amortization schedule.

Toggle on extra payments to model the effect of paying more toward principal. You can add a recurring monthly extra (for example, rounding your payment up by $200), a yearly extra on any chosen month (common for tax-refund or bonus payments), and one-time lump-sum payments on specific months. Every change recomputes your schedule live: the summary shows how many months you shaved off, how much interest you saved, and your new payoff date, while a balance-over-time chart compares your accelerated payoff to the original schedule side by side.

Whether you're deciding between an extra $100 a month versus one $1,200 payment a year, or simply curious what it would take to pay off your mortgage five years early, this tool gives you a clear, immediate answer. For more advanced scenarios — seller financing, wrap mortgages, balloon payments, and PDF export — check out the GoFlexi calculator. That calculator also lets you type extra payments directly into any row of the amortization table and see the schedule, payoff date, and interest savings update instantly.