How to use this calculator
- Enter opening card balance, nominal annual rate (%), minimum share of balance including current interest (%), minimum-payment floor.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Monthly interest approximates APR/12. Real cards may use daily balances, fees, separate interest components and different minimum rules. No new spending is assumed.
Worked example
At 0%, a 1,000 balance with a 3% minimum and a 100 floor takes ten payments of 100.
What the result means
See how a percentage-based minimum declines and changes the payoff time.
Common questions
How is the calculation performed?
Each cycle add monthly interest, then pay the greater of the fixed floor and the chosen percentage of that interest-inclusive balance, capped at the amount owed.
What does the model leave out?
Monthly interest approximates APR/12. Real cards may use daily balances, fees, separate interest components and different minimum rules. No new spending is assumed.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.