How this credit card payoff calculator works
The calculator estimates monthly interest from the APR, adds any new monthly charges entered, and subtracts the payment assumptions until the balance reaches zero or the payment is too low to make progress.
Why APR affects payoff time
A higher APR adds more estimated interest each month. If the monthly payment stays the same, more of the payment can go toward interest and less toward reducing the balance.
What happens when payment does not cover interest
If the payment is less than estimated monthly interest plus new charges, the balance does not pay down in this model. The calculator shows a warning instead of a payoff date.
Extra payments and interest
Extra monthly or one-off payments are treated as reducing the balance after monthly interest is calculated. The comparison shows the estimated time saved and interest saved compared with the regular payment only.
What this calculator does not include
This calculator provides general estimates only. It is not financial, tax, legal, accounting or credit advice. It does not account for issuer-specific minimum-payment rules, fees, penalty rates, balance transfers or payment allocation policies.
Key terms and assumptionsMonthly interest, payment assumptions, extra payments, new charges, issuer-rule limits and region settings.
- Monthly interest
- APR is divided by 12 to estimate monthly interest on the remaining balance.
- Monthly payment
- The calculator uses the monthly payment entered, not a card issuer minimum-payment formula.
- Extra payments
- Extra monthly and one-off payments are assumed to reduce the balance after monthly interest and new charges are applied.
- New charges
- New monthly charges are added to the balance each month and can lengthen or prevent payoff.
- Issuer rules
- Actual payoff amounts can vary because of fees, payment allocation rules, minimum-payment formulas, penalty rates and statement timing.
- Region settings
- Region settings change defaults and currency formatting only. They do not convert exchange rates.
Guides and methodology
Plain-English notes that explain the assumptions behind related calculators and tools.
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FAQs
How is credit card interest estimated?
The calculator divides APR into a monthly rate and applies it to the remaining balance each month.
What if my payment does not cover interest?
The calculator warns that the balance would not pay down under the assumptions entered.
Does this use minimum-payment rules?
No. It uses the monthly payment you enter and does not model issuer-specific minimum-payment formulas.
Can I include new purchases?
Yes. New monthly charges can be entered in More inputs, but new spending can slow or prevent payoff.
How do extra payments help?
Extra payments can reduce the balance faster, which may reduce future interest under these assumptions.
Does this include fees?
No. It does not include late fees, annual fees, balance transfer fees, penalty rates or issuer-specific payment allocation rules.
Is this financial advice?
No. This is a payoff estimate based on the numbers entered, not financial, credit, tax, legal, accounting or debt counselling advice.
Does changing region convert currencies?
No. Region settings change defaults and currency formatting only. They do not perform exchange-rate conversion.