Credit Card Interest Calculator
Calculate your total credit card interest charge and view a month-by-month balance table.
Before you calculate
A constant-balance daily-interest estimate cannot reproduce a statement with purchases, payments, grace periods or multiple APR balances.
Credit Card Interest Formula
Credit card interest is calculated daily using your APR divided by 365.
Estimated interest = Balance × (APR / 365) × days (APR entered as a decimal)Example Scenarios
Minimum Payments
Paying only the minimum on a $5,000 balance at 20% APR can take over 10 years to pay off.
Paying in Full
Paying your full balance each month avoids all interest charges.
Sources & calculation notes
Maintained by MoneyCalc. Results are estimates based on the inputs and assumptions shown, not personalized financial advice or a lender quote. Default rates are examples unless a specific tax year or official table is identified.
References explain the underlying concepts or rules. They do not endorse or independently certify this implementation.
Calculations run in your browser. Some tools retain settings on this device. Displayed rounding can produce small differences from a statement or contract.