Loan Payoff Calculator – See Your Payoff Date & Total Interest

Calculate your loan payoff date, monthly payment, and total interest paid. Free simulator for mortgages, auto loans, personal loans, and more.

About this tool

A loan payoff calculator helps you understand exactly how long it will take to pay off a debt, how much interest you will pay over the life of the loan, and how extra payments can dramatically reduce both the repayment period and the total cost. Whether you are managing a car loan, a personal loan, a student loan, or a mortgage, understanding these numbers puts you firmly in control of your financial future. The core of any loan payoff calculation is the **amortization formula**. Each period, your lender charges interest on the remaining balance. Your payment first covers that interest charge, and whatever is left over reduces the principal. In the early months of a loan, the majority of your payment goes toward interest. As time passes and the balance shrinks, an increasing share of each payment chips away at the principal — this is why making even small extra payments early in a loan's life can save a surprisingly large amount of money. The standard formula for a fixed monthly payment is: **M = P × [r(1+r)^n] / [(1+r)^n − 1]**, where P is the principal, r is the periodic interest rate (annual rate divided by the number of periods per year), and n is the total number of payment periods. This calculator applies that formula and then simulates the amortization period-by-period, applying any extra payment you specify so you can see the real-world impact. Payment frequency matters more than many borrowers realize. Switching from monthly to bi-weekly payments effectively means you make one full extra payment per year (26 half-payments versus 12 full payments), which can shave months or even years off a long-term loan. Weekly payments compound this effect further. This simulator lets you compare all three frequencies so you can choose the strategy that fits your cash flow. Extra monthly payments are one of the most powerful tools available to borrowers. Even an additional $50 or $100 per month can reduce a 5-year auto loan by several months and save hundreds of dollars in interest. On larger loans like mortgages, the savings can be in the tens of thousands of dollars. Use the **Extra Monthly Payment** field to experiment with different amounts and instantly see how your payoff date shifts. Keep in mind that this tool provides estimates based on a fixed interest rate and does not account for factors such as variable-rate adjustments, fees, prepayment penalties, or changes in your payment schedule. Always review your loan agreement and consult your lender for precise payoff figures before making financial decisions.

FAQ

Q. How does making extra payments affect my loan payoff date?
A. Extra payments reduce your principal balance faster, which means less interest accrues each period. This creates a compounding benefit: each subsequent payment covers more principal and less interest, shortening your repayment timeline. Even a modest extra payment each month can cut months or years off your loan depending on the balance and rate.
Q. Why does bi-weekly payment save more money than monthly?
A. With bi-weekly payments you make 26 half-payments per year, which equals 13 full monthly payments instead of 12. That one extra payment per year goes entirely to principal reduction, cutting your balance faster and reducing the total interest you owe over the life of the loan.
Q. What is the difference between the loan term and the actual payoff time shown?
A. The loan term is the original schedule agreed upon with your lender. The actual payoff time shown by this calculator reflects how long it will take when your extra monthly payment is factored in. If you enter $0 for extra payment, the two figures should match. Adding extra payments shortens the actual payoff time below the original term.
Q. Does this calculator account for fees or prepayment penalties?
A. No. This simulator calculates payoff based on principal, interest rate, and payment amounts only. Some loans carry origination fees, late fees, or prepayment penalties that could affect your true cost of borrowing. Check your loan agreement for these terms, as prepayment penalties in particular can reduce the savings from extra payments.
Q. Can I use this calculator for a mortgage?
A. Yes. Enter your remaining mortgage balance as the loan amount, your current interest rate, and the number of months remaining on your loan. You can then experiment with extra payments to see how quickly you could build equity and pay off your home. Note that property taxes and homeowner's insurance (often included in a mortgage escrow payment) are not part of this calculation.

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