Credit Card Interest Calculator
Enter your card balance and APR to see roughly how much interest it costs you over a year.
- Free
- No sign-up
Enter the balance and APR to see the annual interest.
Worked example
With these example inputs:
- Card balance$5,000
- APR22%
Annual interest: $1,100
- Interest this month$91.67
Frequently asked questions
How is credit card interest calculated?
Multiply the balance by the APR to estimate the yearly interest. A $5,000 balance at 22% costs about $1,100 a year if the balance stays put.
Why is my actual interest different?
Cards usually compound daily on the average balance, and paying anything down lowers the interest. This figure is a simple yearly estimate on a constant balance, not a month-by-month total.