Daily Credit Card Interest Calculator
Your card charges you interest every single day — you just never see the number. Enter your balance and APR to see what today cost you.
The formula
Daily interest = balance × (APR ÷ 365). A $6,500 balance at 22% APR: 6,500 × 0.000603 ≈ $3.92 per day — about $27 a week, $120 a month, $1,430 a year. Nothing was purchased for that money; it's purely the cost of carrying the balance. Most issuers compute this on your average daily balance and post it once per cycle as a single "interest charge," which is why the daily bleed is invisible on your statement.
The number is also the motivation trick: "$4 a day" is concrete in a way "22% APR" never is. It's a skipped coffee, every day, forever — until the balance hits zero.
Frequently asked questions
How do I calculate daily interest on a credit card?
APR ÷ 365 × balance. A $6,500 balance at 22% APR costs about $3.92 per day.
How much does the average American pay?
As of Q2 2026, the average revolving balance is $6,618 at a 22.15% average APR on accruing accounts — about $4.02 in interest daily, around $1,466 a year (full statistics & sources).
Does interest really accrue daily?
Yes. Most issuers use an average-daily-balance method: interest builds every day and posts monthly as one charge.
How do I make it stop?
Every dollar of balance you remove lowers tomorrow's cost immediately. Pay above the minimum, attack the highest-APR card first, or move the balance to a lower rate. Our payoff calculator shows how fast you can be done.
Estimates for information only — not financial advice. Your issuer's exact daily-balance math may differ slightly.