How to use the Credit Card Interest Calculator
Enter the card balance and APR and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
How it works
Calculated from the inputs shown in this tool.
Examples
- 5,000 balance at 22% APR
Monthly interest estimate: 91.67
- 1,200 balance at 19.9% APR
Monthly interest estimate: 19.9
- 12,000 balance at 27% APR
Monthly interest estimate: 270
Limitations and assumptions
Confirm assumptions, units and applicable local rules before relying on results. Detailed content, accessibility and edge-case review remains ongoing.
Frequently asked questions
How is credit card interest calculated?
Issuers apply a daily rate, APR ÷ 365, to the daily balance. A monthly estimate of balance × APR ÷ 12 is close.
Can I avoid interest?
Usually yes, by paying the full statement balance before the due date.
Does the estimate include new purchases?
No, only the balance you enter.
How fast can I pay it off?
Use the debt snowball or avalanche calculator for a payoff plan.