Monthly Interest Credit Card APR Calculator
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Reviewed by Calculator Editorial Team
Understanding how credit card interest accumulates is crucial for managing your finances. This calculator helps you determine the monthly interest charges based on your credit card's Annual Percentage Rate (APR).
How to Use This Calculator
To calculate your monthly credit card interest:
- Enter your credit card balance in the "Current Balance" field.
- Input your credit card's Annual Percentage Rate (APR) in the "APR" field.
- Select the billing cycle period (monthly or daily).
- Click "Calculate" to see your estimated monthly interest.
The calculator uses the formula for simple interest when the billing cycle is monthly, and the average daily balance method when the billing cycle is daily.
How Credit Card Interest Works
Credit card interest is calculated based on your balance and the APR. There are two common methods:
Monthly Billing Cycle
For monthly billing cycles, interest is calculated on the average daily balance for the billing period. The formula is:
Daily Billing Cycle
For daily billing cycles, interest is calculated on the daily balance. The formula is:
Most credit cards use the average daily balance method, which can result in lower interest charges if you pay your balance in full each month.
Example Calculation
Let's say you have a $1,500 credit card balance with a 19.99% APR on a monthly billing cycle. Here's how the calculation works:
This means you would pay $24.99 in interest each month on this balance.