How is credit card interest calculated?

This calculator uses a simplified monthly interest model: the annual percentage rate (APR) divided by 12 gives the monthly rate, which is applied to the remaining balance each month. Real credit cards typically use daily balance calculations, so actual results may differ.

Does this calculator store my financial information?

No. All calculations run entirely in your browser. Your inputs are never sent to a server, stored, or collected.

What happens if my monthly payment is too low?

If your monthly payment is not enough to cover the monthly interest, the calculator displays a warning explaining that the balance will never be paid off at that payment amount. You need to increase the payment to make progress.

Credit Card Payoff Calculator

Estimate how long it will take to pay off your credit card balance and how much interest you will pay. Compare two payment amounts to see potential savings. All calculations run in your browser — your inputs are never sent anywhere.

Enter Your Information

Current Balance

Annual Interest Rate (APR)

Monthly Payment

Compare with a Higher Payment (optional)

Enter a higher amount to see how much interest you could save and how many months sooner you could be debt-free.

Your Estimated Payoff

Time to Pay Off

3 years

Total Interest Paid

$2,135

Total Repayment

$7,135

$5,000 balance + $2,135 interest

Comparison: $200/mo vs. $300/mo

At $200/month

Time to pay off: 3 years
Total interest: $2,135

At $300/month

Time to pay off: 1 year, 9 months
Total interest: $1,206

Estimated Savings

Interest saved

$930

Time saved

1 year, 3 months

How This Calculator Works

Calculation method: Each month, interest is calculated by dividing your APR by 12 and applying that monthly rate to the remaining balance. Your monthly payment first covers the interest, and the remainder reduces your principal balance. This process repeats until the balance reaches zero.

Assumptions: These estimates assume a fixed APR, fixed monthly payments, no new purchases, and no additional fees (such as late fees or annual fees). Your actual credit card may use a daily balance method to compute interest, which can produce slightly different results. Real payoff times and interest costs may vary.

Not a guarantee: This calculator provides estimates for educational purposes only. It does not predict your credit score, guarantee specific savings, or constitute financial advice. For a precise payoff plan, check your card statement or contact your card issuer.

Important Notes

0% APR: If your card has a 0% promotional APR, the entire monthly payment goes toward principal. The calculator handles this automatically.
0% balance: If your balance is zero, the calculator shows zero months and zero interest.
Insufficient payment: If your payment does not cover the monthly interest, a warning appears — the balance would grow rather than shrink at that payment level.
Privacy: All calculations happen in your browser. Nothing you type is sent to a server, stored, or collected.

Debt Payoff Strategies

Compare the avalanche and snowball methods

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Educational tool only. CredNavid provides this calculator for general informational and educational purposes. It is not financial advice and does not guarantee any outcome. Credit card terms vary by issuer and may change. For personalized guidance about your debt, consider consulting a qualified financial counselor. See our Editorial Policy for more information.