Why won't a low payment ever clear the card?

If your payment is less than the monthly interest, the balance grows. Your payment must exceed the first month's interest.

What formula does the Credit Card Payoff use?

It calculates using Months = −log(1 − r·B/P) / log(1+r), r = APR/12. The guide above walks through what each part means with a worked example.

How accurate is the Credit Card Payoff?

It uses standard, widely-accepted financial formulas, so the math is exact for the figures you enter. Real-world numbers can differ once lenders, taxes, fees and rounding are applied, so treat the result as a close estimate rather than a formal quote.

Does the Credit Card Payoff include taxes and fees?

It includes only the fields shown on the form. Where inputs for extra costs (fees, taxes, insurance) are available, add them for a fuller picture — a real quote may still vary by provider.

Is this calculator free to use?

Yes — every GKCalculators calculator is 100% free with no sign-up required. Create a free account only if you want to save your calculation history across devices.

All calculations run instantly in your browser. Nothing is sent anywhere unless you tap ‘Explain my results’ (AI) or ‘Save’ while signed in.

Can I share my result?

Yes. Tap Share and we copy a link with your exact inputs baked in, so anyone who opens it sees the same result.

Credit Card Payoff

How long to clear a card balance and the total interest you'll pay.

Compare

Currency

Card balance

APR %

Monthly payment

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Time to pay off

2 yr 10 mo

$1,749.88 paid in interest

Total interest

$1,749.88

Total paid

$6,749.88

Months

AI Breakdown & Smart Takeaway

Plain-English insight on your numbers

Get a personalized explanation of what these results mean — and how to improve them.

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How the Credit Card Payoff works

The Credit Card Payoff Calculator shows you exactly how many months it will take to eliminate your card balance at any fixed monthly payment, and reveals the true total interest cost along the way. It's built for anyone carrying revolving credit card debt who wants a clear, honest picture of what that balance is really costing them.

At its core, this calculator applies your card's Annual Percentage Rate (APR) on a monthly basis to your current balance, then subtracts your fixed monthly payment to find the new balance. This cycle repeats month after month until the balance hits zero. Because interest is charged before your payment is credited, even a modest APR like 20% can dramatically extend your payoff timeline when your payment barely exceeds the monthly interest charge. The calculator surfaces this dynamic instantly, making the invisible cost of carrying a balance completely visible.

The most important variable in the calculation is the gap between your monthly payment and the monthly interest charge. Your monthly interest charge equals your APR divided by 12, multiplied by your current balance. If your APR is 24% and your balance is $5,000, you're accruing roughly $100 in interest every single month. A $150 payment leaves only $50 actually reducing the principal — meaning you'd need years, not months, to clear the debt. Increasing your payment even modestly has an outsized impact because it both reduces the principal faster and lowers the base on which future interest is calculated.

Minimum payments are where most people fall into a long-term debt trap. Credit card issuers typically set minimum payments as a percentage of the balance (often 1–2%) or a small flat dollar amount, whichever is greater. Because minimum payments shrink as the balance shrinks, they are deliberately designed to keep you in debt for an extended period while maximizing total interest paid. Comparing a minimum-payment scenario against a fixed, higher payment in this calculator often reveals a difference of thousands of dollars in interest and many additional years of debt — a powerful motivator to pay more than the minimum.

Beyond the math, the calculator supports two popular debt-reduction strategies: the avalanche method (paying off the highest-APR card first to minimize total interest) and the snowball method (paying off the smallest balance first for psychological momentum). While this calculator focuses on a single card, understanding your total payoff timeline per card lets you prioritize intelligently. A common mistake is ignoring new charges added to the card during the payoff period — those reset your math entirely. For the calculator's projections to hold, you should stop adding new purchases to the card you're trying to pay off.

Formula

Months = −log(1 − r·B/P) / log(1+r),  r = APR/12

Pro tips

Even $25 extra per month can cut months of payments and hundreds in interest.

Key terms

APR (Annual Percentage Rate): — The yearly interest rate charged on your unpaid credit card balance, which is divided by 12 to calculate the monthly interest charge applied each billing cycle.
Minimum Payment: — The smallest amount your card issuer requires you to pay each month, typically calculated as a percentage of your balance or a flat minimum — whichever is higher.
Principal: — The original or remaining amount of debt you owe, excluding any interest charges that have accrued.
Amortization: — The process of gradually reducing a debt balance through regular scheduled payments, each of which covers both the interest charge and a portion of the principal.
Total Interest Paid: — The cumulative dollar amount of interest charges you will pay over the entire repayment period, over and above the original balance borrowed.
Revolving Credit: — A type of credit, such as a credit card, where you can borrow up to a limit, repay it, and borrow again — with interest charged on any unpaid balance carried month to month.