This credit card calculator estimates how many months a fixed monthly payment needs to clear a balance at a stated APR. Enter balance, APR, and payment. The default 5000 balance, 19.99% APR, and 200 payment returns 33 months.
It is meant for interest aware payoff planning on a single balance path. For a general amortizing loan payment instead of months to clear a card, use the loan calculator. For simple interest teaching examples, see the simple interest calculator.
How the formula works
Convert APR to a monthly rate r. If the payment exceeds balance × r, solve months from the standard payoff logarithm and round up to a whole month. If the payment cannot cover interest, payoff does not finish.
Worked example
Balance 5000, APR 19.99%, payment 200. The monthly rate is about 0.016658. The solved payoff length rounds up to 33 months.
| Input | Value |
|---|---|
| Balance | 5000 |
| APR | 19.99% |
| Monthly payment | 200 |
| Months to payoff | 33 |
How to use the fields
- Balance is the amount you want to retire.
- APR is the annual percentage rate on the card.
- Monthly payment is the fixed amount you plan to send each month.
Interest pressure
High APRs make early payments lean heavily toward interest. Raising the fixed payment shortens the schedule more than people expect because less interest accrues in later months.
Common mistakes
- Entering a payment that only covers interest
- Ignoring new purchases that refresh the balance
- Using a promotional APR without noting when it expires
- Confusing months to payoff with total interest dollars
Fixed payment discipline
Keep the payment constant even as the statement minimum falls. That habit is what the 33 month default path assumes. If you reduce the payment with the minimum, the real timeline stretches.
Comparing offers
Change APR alone to mimic a lower rate card, or change payment alone to mimic a stricter budget. Compare month counts before you combine both changes.
Planning notes
Write the payoff month count next to the payment so you can calendar an end date. Recalculate after any large purchase or balance transfer fee adds to principal.
This page focuses on the card style defaults. If you already drafted a payoff page with other sample numbers, keep the stories distinct so readers are not bounced between identical examples.
Payment experiments
Raise the payment by 50 and recalculate months. The drop in payoff time is often larger than intuition suggests because interest has less time to accrue.
Lower the payment toward the interest only edge and watch the tool refuse a finite schedule. That failure mode is educational: it shows why tiny payments stall balances.
APR shopping
Balance transfer marketing quotes low intro APRs. Model the post intro APR as well, or you will understate months once the promo ends.
If a transfer fee adds to principal, include that fee inside the balance field for a more honest month count.
Statement matching
Issuer statements may use daily compounding. This monthly model is close for planning but not a byte for byte replica of every card agreement.
Use the month count to set a calendar target, then confirm progress against real statements each month.
Multiple cards
This page models one balance path. If you hold several cards, either combine balances with a blended APR estimate or run each card alone and add the month counts only as a rough planning aid.
Blended APR is imperfect when rates differ widely. Separate runs are clearer when one card is much more expensive.
After the first card hits zero, roll that payment to the next balance and recalculate. That rollover habit is how payoff snowballs accelerate.
Limitations
No fees, no penalty rates, no daily compounding schedule, and no new spend. Educational month count only.