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Loan Payoff Calculator
Find out when you will be debt-free. Enter your balance, rate and monthly payment, add any extra you can put toward it, then press Calculate to see your payoff date and interest saved.
Written by TopicDrill Editorial Team·Updated June 2026
How we calculate this
We run a standard amortization: each month interest is charged on the remaining balance at your rate divided by 12, your payment is subtracted, and the smaller balance carries to the next month. We run it twice, once with your scheduled payment and once with the scheduled payment plus any extra, then compare the two payoff dates and total interest. A 100-year cap guards against payments too small to ever clear the loan.
Assumptions: a fixed interest rate, payments applied entirely to this loan, and no fees or prepayment penalties. Figures are estimates for planning, not a loan offer. Method based on standard amortization as described by the CFPB.
Balance over time
With extra Minimum only
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How the loan payoff calculator works
The tool walks your loan forward one month at a time. Each month it charges interest on the current balance, subtracts your payment, and rolls the smaller balance into the next month. It runs the same process twice, once with your minimum payment and once with the minimum plus any extra you add, so you can see both timelines side by side.
The chart plots both balances. The solid orange line is your accelerated payoff and the dashed grey line is the minimum-only path. The gap between where the two lines hit zero is the time you save, and the shrinking area beneath the orange line is the interest you never have to pay.
A worked example
Say you owe 25,000 dollars at 6.5 percent and pay 450 dollars a month. On the minimum alone the loan takes about six and a half years. Add 150 dollars a month and you clear it in roughly four and a half years while saving well over 1,500 dollars in interest. The extra is the same 150 dollars each month, but the earlier it lands the more principal it attacks.
Things to keep in mind
Confirm your lender applies extra amounts to principal and does not just advance your due date, and check there is no prepayment penalty. For a plain-language overview of how loan interest is charged, see the CFPB. If you want to model a single lump-sum prepayment instead of a steady extra amount, try our loan prepayment calculator.
Frequently asked questions
How does paying extra each month speed up a loan payoff?
Every dollar above the scheduled payment goes straight to the principal instead of interest. A smaller principal means less interest accrues the next month, so the balance falls faster and faster. The effect compounds, which is why even a modest extra payment can cut years off the term.
Why does the calculator need my monthly payment instead of the loan term?
This tool starts from where you are today, which is a balance and a payment you are already making. From those two numbers plus the rate it works out how many months remain, so you do not need to remember the original term or how long you have been paying.
What happens if my payment is too small?
If the monthly payment is smaller than the interest that builds up each month, the balance grows instead of shrinking and the loan is never repaid. When that happens the calculator returns an error and asks you to raise the payment above the monthly interest charge.
Is interest saved the same as money in my pocket?
It is money you no longer hand to the lender, so yes, it is a real saving. Just remember the extra payments are cash you commit now. If that money could earn more elsewhere or you carry higher-rate debt, weigh those options before locking it into this loan.
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