Credit Card Calculator
See how long it takes to pay off a credit card balance and how much interest you pay, with extra payments.
Credit Card Calculator — input your values
What does this financial calculator do?
The credit card calculator models how long it takes to clear a card balance given the APR and the payment you make each month. You can base the payment on a percentage of the balance — the typical card method — or a fixed dollar amount, and add extra payments on top.
Because card interest compounds monthly on the remaining balance, paying only the minimum is expensive. The results show the payoff time, the total interest and a month-by-month schedule, making the true cost of carrying a balance visible.
Formula and variables
The balance compounds monthly; the minimum payment shrinks as the balance falls in percentage mode.
| Symbol | Meaning |
|---|---|
| APR | Annual percentage rate |
| paymentₜ | Payment in month t (minimum, fixed or plus extra) |
| balanceₜ | Outstanding balance in month t |
Worked example
A $5,000 balance at 22% APR, paying the typical 2% minimum (with a $25 floor) plus $50 extra per month.
- Monthly rate: 22% ÷ 12 ≈ 1.8333%.
- First month interest ≈ $91.67, payment ≈ $150 ($100 minimum + $50 extra).
- The balance falls month by month and reaches zero in ≈ 45 months.
- Total interest ≈ $2,820, so total paid ≈ $7,820.
Answer: Paid off in about 3.7 years, with roughly $2,820 in interest.
Tips and common mistakes
Tips
- Pay more than the minimum: at 2% minimums on a 22% APR card, the debt can outlast a decade of payments.
- A 0% balance transfer can save hundreds of dollars in interest — but read the transfer fee and the standard rate after the offer ends.
- Every dollar of extra payment attacks the principal directly, saving the exact interest it would otherwise accrue.
- Snowball (smallest balance first) and avalanche (highest APR first) methods both work; pick whichever keeps you motivated.
Common mistakes to avoid
- Treating the minimum payment as if it were a fixed payment — percentage minimums shrink as the balance falls.
- Making the minimum payment but keeping spending on the same card, which can erase any progress.
- Missing that daily compounding on some cards makes the interest slightly higher than this monthly model.
Credit Card Calculator — frequently asked questions
How long will it take to pay off my card with minimum payments?
With a 2% minimum on a $5,000 balance at 22% APR it takes roughly 26 years and about $9,000 in interest — far longer than most people expect. Extra payments make a dramatic difference.
What is the difference between APR and interest rate?
For credit cards they are effectively the same: the APR is the annualized rate applied monthly to the balance. Some cards compound daily, which this calculator approximates with monthly compounding.
How do extra payments help?
Anything beyond the interest charge reduces the principal, which lowers future interest. The earlier the extra payment, the more interest it prevents.
Should I use savings to pay off my card?
Usually yes: credit card interest (20%+) is far higher than savings rates (3% to 5%), so paying the card down is the better financial move — unless it drains your emergency fund completely.
What is a balance transfer?
Moving a balance to a card with a lower rate, often 0% for a promotional period. Used well it saves interest; used poorly, the balance is back at a high rate when the offer ends.
Why does my minimum payment change every month?
Cards charge a percentage of the outstanding balance (often with a fixed dollar floor). As you pay the balance down, the minimum falls along with it — extending the payoff time.