Loan Payoff Calculator — See How Extra Payments Save Interest
See how extra payments can pay off your loan years early and save thousands in interest. Enter your current balance, rate and extra payment amount for a side-by-side comparison showing your debt-free date.
Last updated: June 2026
Extra payment type
Current plan
- Payoff date
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- Months remaining
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- Total interest remaining
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With extra payments
- New payoff date
- —
- Months saved
- —
- Interest saved
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Payoff timeline
| Year | Current balance | With extra |
|---|
A free loan payoff calculator to crush debt early.
A loan payoff calculator answers a question every borrower eventually asks: how much faster could I be debt-free, and how much would I save, if I paid a little more each month? Unlike a loan or EMI calculator that sizes a brand-new loan, this tool is built for a loan you already have. Enter your current outstanding balance, the interest rate, and the monthly payment you make today, then add an extra amount — and watch the two plans line up side by side.
The comparison is deliberately stark. On the left you see your current trajectory: the payoff date, the months you have left, and the total interest still to come. On the right, the accelerated plan shows a new payoff date, the number of months you'd shave off, and the interest you'd avoid — highlighted in green because that's money back in your pocket. A visual timeline makes the gap between the two bars obvious at a glance, and a motivation message tells you in plain language exactly what your extra payment buys you.
Extra monthly, lump sum, or both
You can model three strategies. Extra monthly adds a fixed amount to every payment — the easiest habit to sustain and the one that compounds most over a long loan. A one-time lump sum applies a windfall, bonus, or tax refund to the principal today, stopping interest on that amount immediately. Both combines the two for the biggest impact. Because extra payments go entirely toward principal, they reduce the balance that interest is charged on, which is why even small amounts produce outsized savings over time. Expand the comparison table to see your balance fall year by year under each plan.
Before committing a large prepayment, check whether your loan has a prepayment or foreclosure penalty, keep an emergency fund intact, and weigh paying down high-interest debt against investing. As a guide, prepaying a loan earns you a guaranteed return equal to its interest rate. Everything here runs privately in your browser and works in any of six currencies — your numbers are never uploaded, and you can test as many scenarios as you like.
Financial Disclaimer: Results are estimates for informational purposes only and not financial advice. Figures assume a fixed rate and that extra payments reduce principal; check your loan agreement for prepayment penalties. Consult a qualified professional before deciding.
How it works
Three quick steps — no account, nothing uploaded to a server.
Enter your current loan
Add your outstanding balance, interest rate and monthly payment.
Add an extra payment
Choose extra monthly, a one-time lump sum, or both.
Compare side by side
See your new payoff date, months saved and interest saved instantly.
Debt repayment guidance on this page aligns with resources from the Consumer Financial Protection Bureau (CFPB). Last checked July 2026.
FAQ
Frequently asked questions
How do extra payments help pay off a loan faster?
Every extra payment you make goes straight toward the principal — the amount you still owe — rather than interest. Because interest is charged on the remaining balance, reducing that balance faster means less interest accrues each month, which frees up even more of your regular payment to attack the principal. This snowball effect can cut years off a loan and save a large amount of interest, even from a modest extra amount each month. The calculator above shows your exact months and interest saved.
Is it better to make extra monthly payments or a lump sum?
Both help, and the best choice depends on your cash flow. A one-time lump sum applied today gives an immediate reduction in the balance, so interest stops accruing on that amount right away — powerful if you receive a bonus or windfall. Regular extra monthly payments are easier to sustain and compound their effect over time. Combining both, using the 'Both' option above, delivers the biggest reduction. Compare all three scenarios side by side to see which saves you the most.
Should I pay off debt early or invest instead?
A useful rule of thumb is to compare your loan's interest rate with the return you could realistically earn by investing. Paying off a high-interest debt (such as a personal loan or credit card at 12–20%) gives you a guaranteed, risk-free return equal to that rate, which usually beats market investing. For low-interest debt (such as some home loans), investing may come out ahead over the long term. Also keep an emergency fund before aggressively prepaying. This tool quantifies the interest you'd save by prepaying.
Are there penalties for paying off a loan early?
Some loans carry a prepayment or foreclosure penalty, especially fixed-rate loans and certain personal or business loans, while floating-rate home loans to individuals often cannot charge one. The penalty is typically a small percentage of the outstanding balance or the amount prepaid. Before making a large extra payment, check your loan agreement or ask your lender about prepayment charges, and weigh them against the interest you'd save — which this calculator estimates for you.
Does this work for any type of loan?
Yes. The loan payoff calculator works for any amortizing loan with a fixed monthly payment — home loans, car loans, personal loans, education loans, and more. Just enter your current outstanding balance, the annual interest rate, and your current monthly payment, then add an extra monthly amount or a lump sum. It assumes a fixed interest rate and that extra payments are applied to the principal, which is the standard approach for most loans.
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