Why credit card debt is so expensive
Credit cards commonly carry APRs above 20%. At that level, a large part of each payment goes to interest, and paying only the minimum can stretch a modest balance across many years. This calculator shows you the real timeline and the total interest so you can decide how aggressively to pay.
How to use the calculator
Enter your current balance, your card's APR (shown on your statement), and the fixed amount you plan to pay each month. The calculator simulates the balance month by month and reports how long payoff takes and the total interest paid. Fill in the "pay off in" field to see the monthly payment required to clear the debt by a specific deadline, for example before a promotional period ends or before a big life event.
The "first month interest" figure tells you the minimum your payment must exceed to make any progress at all. If your payment is lower than that, the balance will grow, and the calculator will say it can never be paid off.
The minimum payment trap
Card issuers usually set the minimum payment as a small percentage of the balance plus interest, so the minimum shrinks as the balance shrinks. That keeps you in debt for a very long time. Federal rules require your statement to show how long payoff will take at the minimum. Choosing a fixed payment, as this calculator assumes, and sticking with it even as the balance falls is one of the simplest ways to get out faster.
Strategies to pay off faster
- Stop adding new charges to the card you are paying down; otherwise the target keeps moving.
- Pay more than once a month if it helps your cash flow; interest is often calculated on the average daily balance.
- Ask for a lower APR. Issuers sometimes agree, especially for long-standing customers with on-time payment history.
- Consider a 0% balance transfer if you qualify. Watch for the transfer fee (often 3%–5%) and make sure you can pay off the balance before the promotional rate ends. Use the "pay off in" field to calculate the payment needed.
- Consolidation loans may offer a lower fixed rate, but only help if you avoid building new card balances.
Multiple cards?
If you have several balances, use our debt snowball vs. avalanche calculator to decide which card to attack first. The avalanche method (highest APR first) minimizes interest; the snowball method (smallest balance first) gives quicker wins that help many people stay motivated.
Effect on your credit score
Paying down revolving balances lowers your credit utilization ratio, one of the factors scoring models weigh heavily. Many people see their scores improve as balances fall. Keeping old cards open with a zero balance generally helps utilization, unless the card charges an annual fee you do not want to pay.
Limitations
This calculator assumes a constant APR, no new purchases, no fees, and monthly compounding. Actual issuers calculate interest using a daily periodic rate on the average daily balance, so your statement figures may differ slightly.
Formula used
Monthly rate r = APR ÷ 12. Months to pay off with a fixed payment P on balance B: n = −ln(1 − r·B / P) / ln(1 + r) (rounded up). If P ≤ r·B the balance never falls.
Payment needed to finish in n months: P = B × r / (1 − (1 + r)−n).
Frequently asked questions
What if my card has a 0% intro APR?
Enter 0 for the promotional period to see the payment needed, but note the standard APR will apply to any balance left after the promotion ends.
Why does it say “never”?
Your monthly payment is less than or equal to the interest charged each month, so the balance cannot shrink.
Should I pay off cards or save first?
Many experts suggest a small emergency fund first so new expenses do not land on the card, then aggressive payoff of high-APR debt.
Is the result exact?
It is a close estimate. Issuers use daily balances, which can produce small differences.
Keep planning
- Debt Snowball vs. Avalanche Calculator — compare snowball vs. avalanche for multiple cards.
- APR to APY Calculator — see the effective annual cost of your APR.
- Savings Goal Calculator — build an emergency fund.