How to Calculate Annual Percentage Rate on Credit Card
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Reviewed by Calculator Editorial Team
The annual percentage rate (APR) is a key financial metric that shows the annual cost of borrowing for credit cards. Understanding how to calculate APR helps consumers compare credit card offers and make informed financial decisions.
What is APR?
The annual percentage rate (APR) represents the annual cost of borrowing for credit cards, expressed as a percentage. It's calculated based on the interest charged on a balance over a 12-month period, regardless of how many days in the billing cycle the interest is charged.
APR is different from the annual percentage yield (APY), which accounts for compounding interest. While APR is straightforward, it doesn't reflect the true cost of borrowing when interest is compounded.
How to Calculate APR
Calculating APR involves several steps to ensure accuracy. Here's the standard method:
- Determine the daily balance of your credit card account.
- Calculate the daily interest charge using the card's interest rate.
- Sum the daily interest charges for the billing period.
- Divide the total interest by the average daily balance to get the daily interest rate.
- Multiply the daily interest rate by 365 (or 366 for leap years) to get the APR.
APR Formula
APR = (Total Interest / Average Daily Balance) × 365 × 100
For example, if you owe $1,000 at a 20% annual interest rate, your APR would be calculated as follows:
- Daily interest charge = $1,000 × 0.20 / 365 ≈ $0.5479
- Total interest for 30 days = $0.5479 × 30 ≈ $16.44
- APR = ($16.44 / $1,000) × 365 × 100 ≈ 60.3%
APR vs. APY
While APR and APY both measure interest rates, they differ in how they account for compounding:
- APR is the simple interest rate charged on a loan or credit card balance.
- APY is the effective annual rate that accounts for compounding interest, providing a more accurate picture of the true cost of borrowing.
For example, a credit card with a 20% APR and monthly compounding would have an APY of approximately 21.08%.
Example Calculation
Let's walk through a complete example:
- Assume you have a $1,500 balance on your credit card.
- The card charges 18% annual interest.
- You make a $200 payment at the end of the month.
- Calculate the daily interest charge: $1,500 × 0.18 / 365 ≈ $0.7937
- Total interest for 30 days: $0.7937 × 30 ≈ $23.81
- New balance after payment: $1,500 - $200 + $23.81 = $1,323.81
- APR = ($23.81 / $1,500) × 365 × 100 ≈ 61.5%
Note
The actual APR may vary based on your specific credit card terms and billing cycle.
Frequently Asked Questions
What is the difference between APR and interest rate?
The interest rate is the percentage charged on your balance, while APR is the annualized cost of borrowing that accounts for the timing of interest charges.
How does APR affect my credit card bill?
APR determines how much interest you'll pay on your credit card balance. A higher APR means more interest charges, increasing your total bill.
Can I lower my credit card APR?
Yes, you can often lower your APR by paying your balance in full each month, improving your credit score, or negotiating with your credit card issuer.
Is APR the same for all credit cards?
No, APR varies by credit card issuer, your creditworthiness, and the type of card you have. It's important to compare offers before choosing a credit card.