This debt payoff calculator estimates how many months it takes to clear a balance when you pay a fixed monthly amount against a stated APR. Enter balance, annual rate, and payment. The tool returns months to payoff, total interest, and total paid, assuming the payment stays constant and interest compounds monthly on the remaining balance.
How to use the debt payoff calculator
- Enter the current balance you want to pay down.
- Enter the APR as a percent (for example 19.99).
- Enter the monthly payment you can sustain.
- Read months to payoff, total interest, and total paid.
How the payoff math works
Each month the calculator applies interest on the remaining balance, then subtracts your payment. It repeats until the balance reaches zero, counting months along the way. Total interest is the sum of interest charged across those months. Total paid equals payment × months (with the final month adjusted in spirit by the remaining balance in real statements; this tool reports the modeled schedule totals from Multicalify’s payoff helpers).
If the payment is too low to cover new interest, the balance never falls and the calculator reports that payoff is not possible at that payment level.
Worked example
Balance $5,000, APR 18%, payment $200. Interest in month one is roughly 5,000 × 0.18 / 12 = $75. After the $200 payment, principal reduction is about $125. Repeating this process month by month yields a finite payoff horizon and a total interest figure you can compare against a higher payment scenario.
Snowball and avalanche context
This page models one balance at a time. Snowball (smallest balance first) and avalanche (highest APR first) are ordering strategies across multiple debts. Run each debt here separately, then decide the order outside the calculator. For card-specific wording, use the credit card payoff calculator. To compare combining debts into one loan, see the debt consolidation calculator. Cash-flow room belongs on the budget calculator, and installment sizing on the loan calculator.
Limitations
Fees, penalty APR, deferred interest, and changing minimum payments are not modeled. Results are educational estimates. Creditors may compound differently or post payments on different dates. Confirm payoff quotes with your lender statement tools before making irreversible decisions.
Frequently asked questions
Why does a small payment change matter so much?
Extra dollars go almost entirely to principal once interest is covered, which shortens the schedule and reduces the months that interest can accrue.
Should I include the minimum payment only?
You can, but minimums often keep payoff slow. Enter the payment you actually plan to send each month for a realistic timeline.
Does this include new charges?
No. The model assumes you stop adding to the balance while paying it down.