Credit Card Interest Calculator
The true cost of carrying a credit card balance.
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Time to pay off–
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Total you will pay–
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Assumes a fixed APR, no new purchases, no fees, and one payment per month. These estimates are educational, not personalized financial advice.
How this is calculated
Each month we add interest (balance × APR ÷ 12), subtract your payment, and repeat until the balance is paid — counting months and total interest along the way.
Assumptions: A fixed APR, no new purchases, no fees, one payment per month.
Limitations: Penalty APRs, fees and new spending are not modeled. Minimum payments on high-APR cards can stretch payoff over decades.
A quick note: this calculator is for education only and isn't financial advice.