How to read the result
A result of 50+ years means the selected payment does not reliably amortize the balance within the model's cap. When the payment is viable, the chart shows the slow early decline caused by monthly interest.
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Paying off credit card debt
Card APRs above 20% compound against your balance every month. A modest increase in the monthly payment cuts both the payoff time and the total interest — this shows exactly how much.
How to use this calculator
- Use the statement balance, purchase APR and a fixed payment greater than the first month's interest.
- Test an affordable payment increase and compare both months saved and total interest avoided.
- For multiple cards, model each balance and choose either highest APR first or smallest balance first.
What this estimate does not capture
New purchases, variable APR changes, fees and declining percentage-based minimum payments are excluded. Stop adding charges to the modeled balance if the goal is to use the displayed payoff date.
UNDERSTAND THE NUMBERS
The first payment may mostly cover interest
Fixed educational example · independent of your inputs above. $ means US dollars; these are not current rate quotes or return forecasts.
Start with a $5,000 balance at 24% APR and make no new purchases. Compare fixed monthly payments of $150 and $250. The model charges APR ÷ 12 on the opening monthly balance, then applies the payment.
| Monthly payment | Months to payoff | Total interest |
|---|---|---|
| $150 | 56 | $3,322.09 |
| $250 | 26 | $1,449.36 |
What the difference tells you
The first month's interest is $100. A $150 payment reduces principal by only $50, whereas $250 reduces it by $150. That smaller balance then generates less interest in the next month. A $100 payment would not reduce the initial balance under these assumptions.
Before drawing a conclusion
Real statements may use daily balances, multiple APRs, fees and minimum payments that shrink with the balance. This comparison uses a fixed payment and excludes all new spending. It is not a forecast of your next statement.
A comparison to try
Try a payment just above the first month's interest and compare it with $50 more. Check whether the shorter schedule is still affordable without adding new purchases to the card.
Compare an installment-loan scenario →References for this explanation
Prepared by EconoPi · examples and explanations reviewed September 19, 2026. Tables are our calculations under stated assumptions, not forecasts or recommendations by the referenced organizations.
Frequently asked questions
What happens if I only pay the minimum?
The tool uses a fixed dollar payment, not an issuer minimum that changes with the balance. If the payment is no greater than the first month's interest, the modeled balance does not decline.
How much faster if I add $50 a month?
The effect depends on your balance, APR and original payment. Compare the displayed months and interest with and without the extra $50 while assuming no new charges.
Which card should I pay off first?
Highest APR first (avalanche) minimizes interest; smallest balance first (snowball) keeps momentum.
Do balance transfers help?
A transfer can change the interest cost, but the fee, promotional duration and later rate all matter. This calculator assumes one constant APR, so it does not model a promotional-rate transition.
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All math runs in your browser and your inputs are never sent to a server. Settings are saved locally and share links encode the state in the URL. For information only — not investment or tax advice.