Credit Card Interest Calculator
Enter the card balance, APR and number of days to get the interest charged.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
Credit card issuers charge interest based on a daily periodic rate, derived by dividing the card's APR by 365. The interest owed over a billing period is then balance × (APR ÷ 365) × number of days, which is why carrying a balance for even a few extra days meaningfully increases the finance charge.
Because most cards compute interest this way rather than a flat monthly figure, cardholders and financial counselors use this calculation to see exactly how much a balance costs day by day — and to understand why paying down principal early, even mid-cycle, reduces the total interest charged compared to waiting until the statement due date.
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