What Is a Credit Card APR?
In plain English
APR, or Annual Percentage Rate, is the annualized interest rate charged on outstanding credit card balances. Credit card issuers apply a daily periodic rate (APR divided by 365) to your average daily balance. If you carry a balance month to month, APR determines how fast your debt grows. Paying in full each month means you pay no interest regardless of the APR.
How Is Credit Card Interest Actually Calculated?
Credit card interest is calculated daily using your Average Daily Balance multiplied by the Daily Periodic Rate (APR ÷ 365). The daily interest charges are summed over the billing cycle to arrive at your monthly interest charge. For example, a $1,000 balance with a 20% APR accrues about $0.55 per day, or roughly $16.50 in a 30-day billing period.
What Is the Difference Between Purchase APR, Cash Advance APR, and Penalty APR?
Purchase APR applies to everyday transactions. Cash advance APR — often 25% to 30% — kicks in immediately when you withdraw cash from your card, with no grace period. Penalty APR is a punitive rate, sometimes exceeding 29.99%, triggered by missed payments and applied to your existing balance. Penalty APRs can be permanent unless you make a set number of consecutive on-time payments.
How Can You Avoid Paying Credit Card Interest?
Pay your statement balance in full by the due date every billing cycle. When you do this, the grace period — typically 21 to 25 days after the statement closes — shields you from interest on new purchases entirely. Once you start carrying a balance, the grace period disappears and interest accrues from the day of each purchase. Paying in full restores the grace period.
Frequently asked questions
What is a good credit card APR?
APRs vary widely based on your credit score and card type. Excellent-credit borrowers may see rates around 15–18%, while average-credit borrowers often face 20–27% or more. However, APR becomes less relevant for those who pay their balance in full each month and do not carry a balance.
Can you negotiate a lower APR?
Yes. If you have a good payment history with a card issuer, calling to request a lower APR can work. Issuers have discretion to reduce rates for valued customers. Having a competing offer from another issuer strengthens your negotiating position significantly.
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Related terms
Introductory APR
An introductory APR is a temporary promotional interest rate — often 0% — offered to new credit card customers for a set period. After the period ends, the standard APR applies.
Grace Period (Credit)
A credit card grace period is the window between your statement closing date and payment due date during which you can pay your balance in full and avoid interest charges.
Credit Card
A credit card is a revolving line of credit that lets you borrow money up to a set limit for purchases, then repay it over time. Used responsibly, it builds credit and may earn rewards.
Balance Transfer
A balance transfer moves existing credit card debt to a new card, often with a lower or 0% introductory APR. It can save significant money on interest if paid off before the promotional period ends.
Late Payment
A late payment occurs when you miss a bill due date. Payments more than 30 days past due are reported to credit bureaus and can significantly damage your credit score.
Credit Card Statement
A credit card statement is a monthly summary of your account activity, including all transactions, your balance, minimum payment due, and payment due date.