Formula
Monthly interest = balance × APR ÷ 12. Each month: balance = balance + interest + fee − regular payment − extra payment. Repeat until the balance reaches zero.
Credit Card Calculator
Credit Card Calculator estimates card payoff time, interest, utilization and whether the payment is strong enough to reduce the balance.
Worked example
A 6,000 card balance at 21.99% APR with a 250 payment first adds about 109.95 of interest, then applies the payment to reduce the balance.
Professional note
If the result says payment too low, the payment is not beating the first estimated interest and fee charge. Fix that before comparing payoff dates.
Regional and unit assumptions
Standard or basis: transparent monthly debt-amortisation arithmetic using user-entered APR, fixed monthly payment, optional extra payment and optional monthly fee. It does not claim compliance with any credit disclosure, lender allocation or hardship-assistance rule.
Card proof
Payment must beat interest
Credit card payoff depends on whether the payment survives interest and fees. The page compares the monthly payment with the first interest charge, then shows payoff time, utilization and extra-payment savings.
Visible checks
What the page now proves
- Interest/fee coverage
- Utilization visible
- Payoff impossibility warning
Assumptions and limitations
- APR is converted to a simple monthly rate.
- Payments are applied after monthly interest and fees.
- The payment and extra payment stay constant.
- New purchases, late fees, promotional rates, daily interest and issuer-specific allocation rules are not included.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Monthly interest = balance × APR ÷ 12. Each month: balance = balance + interest + fee − regular payment − extra payment. Repeat until the balance reaches zero.
Standard or basis
Standard or basis: transparent monthly debt-amortisation arithmetic using user-entered APR, fixed monthly payment, optional extra payment and optional monthly fee. It does not claim compliance with any credit disclosure, lender allocation or hardship-assistance rule.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
If the result says payment too low, the payment is not beating the first estimated interest and fee charge. Fix that before comparing payoff dates.
Related calculators
Questions
How do you calculate debt payoff time?
Estimate monthly interest from the APR, add any monthly fee, subtract the planned payment and repeat month by month until the balance reaches zero.
What happens if my payment is too low?
If the payment does not cover estimated monthly interest and fees, the balance will not fall. The calculator reports that the debt is not being paid down under those assumptions.
Does an extra payment reduce interest?
Yes. Extra payment lowers the remaining balance faster, so future monthly interest is usually lower. The exact saving depends on the rate, timing and lender rules.
Is this the same as a credit-card minimum payment calculator?
No. This page uses a fixed monthly payment. Credit-card minimums often change with balance, fees and issuer rules.
Does this include daily interest or late fees?
No. It uses a monthly estimate and only includes a simple optional monthly fee. Check statements or lender tools for official payoff figures.
Calculation note
Credit-card payoff math matters because a revolving balance can keep charging interest while the user feels they are making steady payments.
A card balance needs month-by-month modelling
Interest is added before the payment reduces the balance, so a useful calculator repeats the monthly ledger instead of dividing balance by payment.
Utilization is part of the card picture
Payoff time explains the debt plan, while utilization shows how much of the available card limit is currently tied up.