Credit Card Interest Calculator
Result
Credit Card Interest Calculator — free online calculator.
Formula
- Estimate simple credit-card interest for a balance, APR, and number of days.
- Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Credit Card Interest
This is a simple daily-rate estimate based on a 365-day year. It does not reproduce every issuer’s average-daily-balance or compounding method.
Sample result: Calculating…
Frequently asked questions
What does the Credit Card Interest calculate?
For a $5,000 balance at 20% APR over 30 days, the simple estimate is about $82.19.
Which values should I enter?
Enter the values requested by the calculator using the labels and units shown on the page.
What formula does this calculator use?
The calculator uses the following relationship: Interest = Balance × (APR / 100) × (Days / 365).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.