Credit Card Interest Calculator

How to use the credit card interest calculator

The billing-cycle estimate uses an unchanged balance and your selected daily-interest method. The average-balance method multiplies balance by APR divided by 365 and the number of days. The daily-compounding option applies that daily rate repeatedly. Separately, the payoff schedule uses APR divided by twelve and a fixed monthly payment. These two estimates use different timing assumptions and should not be mistaken for a reconstruction of an actual statement.

Why can my statement show a different charge?

Purchases, payments, promotional balances, cash advances, fees and grace periods can all change interest. Your agreement determines whether and how daily balances compound. Use the appropriate balance and rate for each balance category.

What if my payment is too low?

The tool rejects a payment that does not cover modeled monthly interest, or would take more than one hundred years to clear the balance. New spending is not included.

How should I compare scenarios?

Start with the example, then replace every relevant value with your own figures. Keep the currency and time periods consistent. Change one assumption at a time and calculate again to see its effect. The initial values are examples, not recommended rates, prices or budgets. When comparing alternatives, include the same categories in each scenario so that a missing expense does not make one choice appear cheaper.

Can I save or share the result?

Use Copy summary for a concise text result, or Export CSV for the available figures. Calculations run in your browser; entered amounts are not uploaded by this tool. An exported file contains your information, so choose where to store or share it. Displayed amounts are rounded to two decimal places, while most intermediate calculations retain additional precision. Small differences from a bill or statement can therefore occur.

What should I check before using the numbers?

Read the calculation assumptions beside the result and confirm the inputs against the relevant quote, agreement or records. This tool provides an estimate based on those inputs, not an approval, market forecast or personalized financial recommendation. Refresh the calculation when your circumstances or the underlying terms change.

Reference: CFPB: credit card interest