Daily and Monthly Credit-Card Interest Charge Calculator
Interest is a purchase with no object attached. Estimating the daily and billing-cycle charge shows how much earning time goes only to carrying yesterday’s balance.
A $6,000 balance at 24.99% APR produces about $4.11 in interest per day, or roughly $123 over a 30-day billing cycle if the balance stays unchanged.
Estimate the daily charge
Divide APR by 365, multiply by the balance, and then multiply by the number of days in the billing cycle. Your issuer may use an average daily balance, so the statement remains the final number.
Separate interest from principal
Only the part that reduces principal lowers what you owe. Track interest separately so the carrying cost does not disappear inside the payment.
Compare one extra payment
Use the result to price the tradeoff of sending extra money to the balance. Exact payoff savings depend on the APR, balance, timing, and future charges.
Run your own numbers
The free calculator works in your browser and requires no bank connection or account.
Open the calculator with this example →