Credit Card Interest Calculator — See Your Real Cost

Most people know their credit card balance but not how much they're really paying in interest. This page explains how credit card interest works and how you can see your real cost of borrowing.

How Credit Card Interest Is Calculated

1. Your APR is divided by 365 to get the daily rate
2. Each day, the daily rate is applied to your outstanding balance
3. Daily interest accumulates and is added to your next statement
4. If you don't pay the full statement balance, interest is charged from the date of each transaction

The Hidden Cost: Compounding Interest

Once you start revolving (carrying a balance), you lose the interest-free grace period on new purchases too. Every new charge starts accruing interest immediately. Interest compounds daily, meaning you pay interest on interest.

How Extra Payments Save You Money

Even small increases above the minimum payment make a huge difference. Doubling your minimum payment can cut your payoff time by more than half and save you thousands in interest.

Key Takeaways

• Credit card interest rates range from 15–46% APR depending on your region
• Interest compounds daily, meaning you pay interest on interest
• Paying only the minimum can result in paying 2–3x your original balance
• Even small increases above the minimum payment make a huge difference
• The first step is seeing your actual numbers — that's what Bubbleverse is for