Credit Card Calculator - Balance Payment and Payoff

Estimate credit card payoff time, interest cost, and monthly payment effects from your balance, APR, and payment amount for smarter debt planning.

Enter the card balance, APR, and fixed monthly payment to estimate months to pay off and total interest if you make that payment each month.

Estimate credit card payoff time, interest cost, and monthly payment effects from your balance, APR, and payment amount for smarter debt planning.

Card Balance

Annual Percentage Rate (APR)

Monthly Payment

About Credit Card Payoff Time and Interest

The credit card calculator estimates how long a revolving balance takes to reach zero if you pay a fixed amount each month, and how much interest you pay along the way. Monthly rate r is APR divided by 1,200. Months to pay off is n = ln(payment / (payment − balance × r)) / ln(1 + r), the standard closed-form result for a level payment against a declining balance. Estimated total interest is payment × ceil(n) − balance, which treats every installment as the full payment except that the last month is still counted as a full payment in the ceiling. If the monthly payment is not larger than the first month's interest, the balance never falls and the credit card calculator returns an error instead of a payoff date. Revolving credit is expensive because interest is charged on the remaining principal each month. A $5,000 balance at 18% APR with a $200 payment takes about 31.57 months and roughly $1,400 of interest under this method. Raising the payment shortens n more than a small APR cut in many everyday cases, which is why extra principal is usually the fastest lever. The estimate assumes no new charges, no late fees, a constant APR, and payments posted on schedule. It does not model grace periods, residual interest after a statement, or daily compounding used by some issuers. Use the credit card calculator to compare a minimum-like payment with a payoff target, to see whether a balance-transfer APR would change the timeline, and to show a household member why an extra $50 a month matters. Change one input at a time so the sensitivity is clear. Recalculate after a purchase, a rate increase, or a missed cycle. Caveats: the ceiling approximation slightly overstates interest if the final payment is smaller than the regular amount. Issuer minimums often include interest plus a percent of principal, so a true minimum path is longer than a fixed extra payment. Confirm figures on your statement and consider professional advice for hardship or settlement decisions. Used as a planning worksheet, the credit card calculator makes payoff time and interest cost easier to compare.

Credit Card Calculator Examples

Each example uses monthly rate r = APR / 1200 and the closed-form payoff formula.

Inputs	Result	Notes
Balance $5,000, APR 18%, payment $200	31.57 months; $1,400.00	A typical mid-size balance at a purchase APR with a fixed extra payment.
Balance $8,000, APR 22%, payment $250	48.63 months; $4,250.00	A higher APR and larger principal stretch both time and interest.
Balance $2,500, APR 15%, payment $120	24.28 months; $500.00	A smaller balance with a payment well above monthly interest clears in about two years.

How to Estimate Credit Card Payoff

Enter the statement balance you want to pay down.
Enter the purchase APR as a percent, such as 18 for 18%.
Enter the fixed monthly payment you can actually send, then select Calculate.
Raise the payment or lower the APR and calculate again to compare payoff plans.

Credit Card Calculator FAQ

How does the credit card calculator estimate payoff time?

It converts APR to a monthly rate r = APR / 1200, then uses n = ln(payment / (payment − balance × r)) / ln(1 + r). That is the number of months a fixed payment needs to retire the balance if no new charges are added.

Why must the payment exceed monthly interest?

If the payment is less than or equal to balance × r, principal never declines and the logarithm is undefined. Increase the payment, lower the APR, or reduce the balance before estimating a payoff date.

Is total interest exact?

It is an estimate that multiplies the regular payment by the ceiling of n and subtracts the starting balance. The last statement is often smaller than a full payment, so actual interest can be slightly lower.

Does the credit card calculator include new purchases?

No. It assumes a closed balance and a constant APR. Add expected new charges to the balance, or recalculate after each cycle, if you keep using the card.

How is this different from the minimum payment?

Issuer minimums usually change each month as the balance falls. A fixed payment above the minimum is what this payoff formula models. Compare both approaches if you want to see the cost of paying only the minimum.