Calculate Your Monthly Credit Card Interest

See How Much Credit Card Interest Is Really Costing You

Enter your balance, APR and monthly payment to estimate your monthly interest, payoff time and total interest cost if you continue making the same payment.
Free Calculator  • Educational Estimate  • No Obligation

Credit Card Interest Calculator

Enter the information from your credit card statement. Your results will appear directly below the calculator.
$ %
Enter your current outstanding balance.
$ %
Enter the APR shown on your statement.
$ %
Enter the amount you expect to pay each month.
Credit card interest calculator for estimating credit card interest and payoff costs
Understanding Credit Card Interest

Small Differences in APR Can Add Up Over Time

Credit card interest can make it difficult to reduce a balance when a large portion of each payment goes toward finance charges instead of principal. This calculator can help you estimate how your APR and monthly payment affect your total repayment cost. Increasing your monthly payment may shorten the payoff period and reduce the total amount of interest you pay.

How Does the Credit Card Interest Calculator Work?

The credit card interest calculator uses your current balance, APR and fixed monthly payment to estimate your interest cost and how long repayment could take. Your estimated monthly interest is based on your APR and current balance. The payoff calculation then estimates how the balance may decline if you continue making the same monthly payment and do not make additional purchases.

Why Does Credit Card Interest Matter?

When you carry a credit card balance, part of your monthly payment generally goes toward interest before the remaining amount reduces principal. Higher interest rates can therefore make balances more expensive and extend the repayment period. For example, increasing the amount you pay each month may reduce both your payoff time and total estimated interest. The comparison table above shows how adding $50, $100 or $200 to your payment may affect your results.

What Happens If Your Payment Is Too Low?

If your monthly payment is less than or approximately equal to the interest being added to the balance, your debt may not decline under the assumptions used by this calculator. When that happens, the calculator will alert you rather than showing an unrealistic payoff date.

What If High Credit Card Interest Is Making Repayment Difficult?

If interest rates are making it difficult to reduce your balances, nonprofit credit counseling can help you review your overall financial situation and possible repayment options. Depending on your circumstances and creditor participation, a Debt Management Program may be one option to consider. You can also use DebtWave's Debt Management Plan Calculator to explore estimated repayment terms.
Important: Calculator results are estimates for educational purposes only. Actual interest charges and payoff periods can vary based on billing-cycle length, payment timing, daily balances, purchases, fees, promotional rates, cash advances and the creditor's method of calculating interest. For additional information about credit card interest, visit the Consumer Financial Protection Bureau .