How to Calculate Daily Interest on A Credit Card Purchase
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Reviewed by Calculator Editorial Team
Understanding daily interest on a credit card purchase helps you make informed financial decisions. This guide explains how to calculate it, compares it to the annual percentage rate (APR), and provides practical examples to help you manage your credit card debt more effectively.
What is Daily Interest on a Credit Card?
Daily interest on a credit card is the amount of interest charged on your outstanding balance each day. Unlike the annual percentage rate (APR), which is an annualized figure, daily interest shows the actual cost of carrying a balance from one day to the next.
Credit card issuers calculate daily interest based on the APR and the number of days in the billing cycle. This daily rate helps you understand how quickly your debt grows if you don't pay it off in full each month.
How to Calculate Daily Interest
The formula to calculate daily interest on a credit card purchase is:
Daily Interest = (APR ÷ 365) × Outstanding Balance
Where:
- APR is the annual percentage rate (expressed as a decimal)
- 365 is the number of days in a year (or the number of days in the billing cycle if different)
- Outstanding Balance is the amount you owe on the credit card
This formula gives you the daily interest charge based on your current balance and the card's APR.
APR vs. Daily Interest Rate
The APR is the annualized interest rate, while the daily interest rate is the actual cost of carrying a balance for one day. The relationship between them is:
Daily Interest Rate = APR ÷ 365
For example, if your credit card has an APR of 18.24%, the daily interest rate would be approximately 0.05% (18.24% ÷ 365). This means that for every dollar you owe, you'll accrue about 5 cents in interest each day.
Example Calculation
Let's say you have a credit card with an APR of 18.24% and an outstanding balance of $1,000. Here's how to calculate the daily interest:
Daily Interest = (18.24% ÷ 365) × $1,000
Daily Interest = (0.05 ÷ 365) × $1,000
Daily Interest ≈ $0.14
This means you would accrue approximately $0.14 in interest each day on a $1,000 balance with an 18.24% APR.
Common Mistakes to Avoid
When calculating daily interest, it's easy to make a few common mistakes:
- Using the wrong APR: Always use the current APR on your credit card statement, not an old rate or a rate from a different card.
- Ignoring the billing cycle: Some credit cards have billing cycles that aren't 30 or 31 days. Check your statement for the exact number of days in your billing cycle.
- Rounding errors: Be careful with rounding, especially when dealing with small daily interest amounts.
Pro Tip: Use our daily interest calculator to quickly and accurately calculate your daily interest charges.
FAQ
How often is daily interest calculated on a credit card?
Daily interest is typically calculated and added to your balance each day that you carry a balance. The exact timing can vary by credit card issuer, but most cards calculate interest daily.
Does daily interest compound?
Yes, daily interest compounds on the outstanding balance each day. This means the interest you earn one day is added to your balance and earns interest the next day.
Can I avoid daily interest charges?
Yes, you can avoid daily interest charges by paying your credit card balance in full each month before the statement closing date.