Debt Payoff Calculator
Find out how long a debt really takes to clear at your current payment, and what a few extra dollars a month would change.
Last updated: August 5, 2026
How long it really takes to clear a debt
Debt is repaid the same way a loan is: each month a payment arrives, interest on the balance is taken out first, and whatever is left shrinks the amount you owe. At a high rate, the interest slice can be most of your payment, which is why balances can feel like they barely move.
This calculator shows the math honestly. If your payment does not even cover the monthly interest, the balance grows and the debt is never cleared — the calculator flags that so you know. Otherwise it works out how many payments are needed and how much interest you pay along the way.
Then it repeats the sum with an extra monthly amount, so you can see the payoff date and interest savings from paying a little more. Sometimes the result is surprising: an extra $25 a month can save hundreds of dollars and cut years off a high-rate balance.
The formula
where r is the monthly rate (annual ÷ 12, as a decimal) and payments are fixed. This is the standard formula for how long a debt takes to amortise.
Worked example
A $5,000 credit card balance at 20%, paid at $150 a month.
Payoff takes about 49 months and costs roughly $2,360 in interest.
Adding $25 a month ($175 total) clears it in about 39 months and saves around $510.
The savings grow even larger for bigger balances, which is why finding any room in the budget to pay a little extra is usually worth it.
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Frequently asked questions
Which debt should I pay off first?
Financially, the one with the highest rate costs the most and is worth attacking first. If you need motivation more than arithmetic, some people prefer clearing the smallest debt first to build momentum.
My payment changes with the balance. Is this accurate?
Most credit cards fix a minimum that falls as the balance falls. This calculator assumes a constant payment, so the estimate is best for people paying a fixed amount each month.
Should I consolidate instead?
Consolidation can lower your rate and simplify payments, but it only works if the payment stays the same or higher. Compare the total interest here with any consolidation offer before deciding.
This calculator gives an estimate only and is not financial advice. Lenders set the actual rates, fees and minimum payments.