Credit Card Calculator

Credit card debt is expensive — often 20%–30% APR compounding daily. This calculator shows you exactly how much interest you're paying and how long it'll take to pay off your balance with your current payment strategy.

How to Use This Calculator

1. Enter your current credit card balance.
2. Enter the card's annual interest rate (APR).
3. Enter your monthly payment amount.
4. Click Calculate to see payoff timeline, total interest paid, and a month-by-month schedule.

The Minimum Payment Trap

Credit card minimum payments are typically 1%–2% of the balance. Paying only minimums on a $5,000 balance at 24% APR:

• Minimum payment (starting ~$100/month): takes 300+ months (25 years) to pay off
• Total interest paid: $7,500+ — more than the original balance
• With $250/month instead: pays off in 26 months, only $1,173 in interest

Credit Card Interest Formula

Daily Periodic Rate = APR ÷ 365

Monthly interest = Average Daily Balance × Daily Rate × Days in period

Most cards compound daily — this is why high APR debt is so dangerous.

Common Mistakes to Avoid

• Only paying the minimum — It keeps you in debt for decades. Pay as much as possible above the minimum.
• Missing a payment — A 30-day late payment triggers a penalty APR (often 29.99%) and damages your credit score.
• Ignoring the grace period — If you pay your full balance each month before the due date, most cards charge zero interest. Carrying any balance forward eliminates the grace period.
• Only looking at rewards rate, not APR — A 2% rewards card at 26% APR is a terrible deal if you carry a balance. Rewards only make sense if you pay in full monthly.

Frequently Asked Questions

How is credit card APR applied?

Most cards compound interest daily. The daily rate = APR ÷ 365. Interest is calculated on your average daily balance and added to your account at the end of each billing cycle.

What is a balance transfer?

Moving a balance from a high-APR card to one with a 0% promotional rate (usually 12–21 months). You pay a transfer fee (typically 3%–5%) but pay no interest during the promotional period — saving significant money if you pay off the balance before the promo ends.

How does my balance affect my credit score?

Credit utilization (balance ÷ credit limit) is 30% of your FICO score. Keeping utilization below 30% (ideally under 10%) significantly improves your credit score.

Should I pay off credit cards or invest?

If your card APR is above 8%, paying off the card provides a guaranteed return equal to the APR — almost always better than investing. See our Debt Payoff Calculator for a full comparison.

Conclusion

Credit card debt is one of the most expensive forms of borrowing. Run this calculator to see your real payoff timeline — the number is often shocking enough to motivate aggressive repayment. The faster you pay it off, the more money stays in your pocket.

Related: Credit Card Payoff Calculator | Debt Payoff Calculator | Debt Consolidation Calculator | Interest Rate Calculator