What APR means on a credit card
APR is the annualized cost of carrying a credit card balance. Interest is commonly calculated daily, and different transactions can have different APRs.
By Maya Okafor · Markets Writer
· 5 min read
APR, or annual percentage rate, is the annualized cost of borrowing on a credit card when you carry a balance. For ordinary purchases, the purchase APR generally results in interest if you do not pay the eligible balance in full by the payment due date and the card offers a grace period. Although APR is quoted annually, issuers commonly calculate interest daily.
APR matters most when a balance will remain beyond the due date. Paying eligible purchase balances in full each billing cycle can generally avoid purchase interest. If you carry a balance, check both the APR that applies to the transaction and the issuer's calculation method.
How credit card APR works
APR is a yearly percentage, not the percentage charged on a one-month statement. A 20% APR does not mean a 20% charge for that month. Credit card issuers commonly convert the APR into a daily periodic rate and apply it to the average daily balance, the average amount owed during the billing cycle.
APR can include certain fees, making it a broader borrowing-cost measure than an interest rate alone. But credit card APR may be the same as the stated interest rate because cards do not typically carry the loan-style fees associated with products such as mortgages. Check the card's own disclosure rather than assuming an annual fee is included in its APR calculation.
Turning APR into a billing-cycle estimate
A common calculation is: daily periodic rate × average daily balance × number of days in the billing cycle. The card agreement controls the actual charge, and changes in your balance during the month affect the average daily balance. Treat the calculation as an estimate, then confirm the actual finance charge on your statement.
Worked example: a constant $1,000 balance
- APR: 20%
- Assumed average daily balance: $1,000 each day
- Assumed billing cycle: 30 days
- Convert the annual APR to a daily rate: 20% ÷ 365 = 0.0548% per day.
- Write the daily rate as a decimal and apply it to the balance: 0.000548 × $1,000 = about $0.548 per day.
- Apply that amount over 30 days: about $0.55 × 30 = about $16.50 in interest for the cycle.
If the balance rises or falls during those 30 days, the average daily balance will change. Issuers also commonly calculate interest daily, so later calculations can include interest that has already been added to an unpaid balance.
One card can list several APRs
The APR to review depends on the transaction. The purchase APR is only one rate in a card agreement.
- Purchase APR: The standard rate for ordinary purchases when an eligible purchase balance remains past the due date.
- Introductory or promotional APR: A reduced rate, sometimes 0%, for specified transactions and a limited period. The standard rate applies after the promotion ends.
- Balance-transfer APR: The rate for debt moved from another card. It may be promotional and time-limited, or it may differ from the purchase APR.
- Cash-advance APR: The rate for taking cash against a credit line. It is typically higher than the purchase APR and generally has no grace period.
- Penalty APR: A higher rate an issuer may apply after late payments or other violations of the account terms.
Paying a statement balance by its due date can prevent purchase interest when a grace period applies. That treatment does not generally extend to cash advances.
Why a card's APR can change
Many cards have a variable APR, meaning the rate is tied to an underlying benchmark such as the prime rate. The APR can rise or fall as that benchmark changes under the card's terms. A fixed-rate APR does not move with a benchmark in the same way. Credit history and credit scores also typically affect the rate offered when an account is opened.
Issuers generally disclose APR during the application process, and the rate appears on monthly statements. Review the rates-and-fees terms to see which APR applies to purchases, transfers, cash advances and penalties. An issuer generally must provide at least 45 days' notice before changing an APR.
A quick way to read your card's APR
- Name the transaction. Identify whether it is a purchase, balance transfer, cash advance or promotion-covered transaction.
- Find the applicable APR. Do not rely only on a purchase-APR figure in an advertisement.
- Check for a grace period or promotion. Review its scope, expiration date and terms.
- Estimate the charge if a balance will remain. Use the APR, expected average daily balance and billing-cycle length.
- Confirm the details in your agreement and statement. Those documents set the issuer's actual rate and calculation terms.
Frequently asked questions
How is credit card interest calculated from APR?
Issuers commonly divide the APR by 365 to determine a daily periodic rate, multiply that rate by the average daily balance, then multiply by the number of days in the billing cycle. The card agreement determines the actual calculation, and a changing balance changes the average daily balance.
Can I avoid credit card interest by paying the statement balance in full?
For eligible purchases, paying the balance in full by the payment due date generally avoids interest when the card provides a grace period. Cash advances typically have no grace period, so paying by the due date may not prevent interest on those transactions.
Why can my credit card APR change?
Many credit cards have variable APRs tied to an underlying benchmark, such as the prime rate, so the rate can rise or fall under the card terms. An issuer generally must provide at least 45 days' notice before changing an APR.
Sources
- How APR Works and Your Credit Score Impact - Citizens Bank — www.citizensbank.com
- What is a Good APR for a Credit Card? - Equifax — www.equifax.com
- What is APR on a credit card? - U.S. Bank — www.usbank.com
- What's A Good APR For A Credit Card? - Bankrate — www.bankrate.com