Credit Card Payoff Calculator
See how long it takes to pay off a card balance and the total interest.
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How it works
The tool simulates your card month by month. Each month it adds interest at the monthly rate (APR ÷ 12), subtracts your fixed payment, and repeats until the balance reaches zero — counting the months and summing the interest along the way. If your payment is smaller than the first month's interest, the balance never falls, and the tool warns you instead of looping forever. Currency formatting is configurable. Everything runs locally in your browser, so your debt figures stay private.
monthlyInterest = balance × (APR / 12 / 100)
balance = balance + interest − payment
Common use cases
- Seeing how many months a fixed payment needs to clear your balance.
- Finding out how much interest a card will cost in total.
- Testing how a bigger monthly payment shortens your payoff.
Frequently asked questions
Why does it warn that the card will never be paid off?
If your monthly payment is less than or equal to the interest added that month, the balance stays flat or grows, so it can never reach zero. The tool detects this and tells you to increase the payment.
Does it assume I add new charges?
No. It assumes you stop spending on the card and only make payments. New purchases would extend the payoff time and increase total interest.
Is my financial data uploaded?
No. The simulation runs entirely in your browser. Nothing you enter is sent to a server or stored.