Credit Card Interest Calculator
Estimate daily and monthly credit card interest from your balance and APR, see how much of your next payment may go to principal, and calculate the total interest charged before payoff.
Your numbers
Example loaded: $7,500 balance, 22% APR, and a $225 monthly payment. Replace the example numbers to calculate your own estimate.
How this calculator works
This calculator estimates daily interest with APR ÷ 365 and first-month interest with APR ÷ 12. It then models how the balance changes with the monthly payment and optional extra monthly payment.
It shows a daily planning estimate, estimated interest before the next payment, a simple one-year snapshot, total interest until payoff, total paid, payoff date, and the share of the next payment going to interest.
For more explanation of APR, daily and monthly interest, and payment pressure, use the credit card interest guides.
Results
Interest impact
Next payment breakdown
Payoff outcome
Total paid breakdown
- The daily interest snapshot uses the starting balance and APR ÷ 365. Some issuers use 360 days and calculate statement interest from a daily or average daily balance. See the CFPB explanation of common credit card interest calculations.
- The payoff model accrues interest monthly using APR ÷ 12.
- Loaded example: $7,500 × 22% ÷ 12 = $137.50 in estimated first-month interest.
- Payments are modeled once at the end of each month.
- Interest charged before your next payment is an estimate based on the starting balance and APR.
- The note below the monthly payment field may flag payments that are close to a typical minimum-payment level. Actual issuer minimum-payment rules vary.
- The simple one-year interest estimate assumes the same balance is carried for the full year.
- Total interest until payoff is based on your entered monthly payment and optional extra monthly payment.
- The total paid breakdown separates the original balance from estimated interest so you can see how much of the projected repayment is borrowing cost.
- The payment breakdown shows an estimate of how much of your next payment goes to interest versus principal.
- No late fees, annual fees, promotional rates, penalty APR changes, or issuer-specific daily balance methods are included.
How to read your interest result
Read the result in three steps. Start with the current interest charge, check how the next payment splits between interest and principal, and then review the total payoff cost. That sequence shows both what the balance is costing now and what could happen if the payment stays unchanged.
Current interest charge
The daily and monthly estimates show the immediate cost of carrying the current balance. They are snapshots, not predictions that the balance will remain unchanged.
Next payment split
The interest share shows how much of the next payment covers borrowing cost. The principal portion is the amount that lowers the balance.
Total payoff cost
Total interest and payoff time show the longer-term effect of the entered payment. A long payoff gives interest more billing cycles in which to accumulate.
If interest takes a large share of the next payment and the payoff still lasts for years, the payment may be reducing the balance too slowly. If most of the payment reaches principal and the payoff time is manageable, the current plan may already be doing useful work.
Should you raise the payment or lower the APR?
The better first test depends on what's creating the cost. Compare the change in total interest and payoff time, not just the new monthly payment.
Raise the regular payment
Start here when the balance is falling but the payoff still takes longer or costs more than you want. A larger fixed payment reduces principal sooner without changing accounts.
Test an extra monthly amount
Use the Extra Payment Calculator when a smaller recurring increase may be sustainable. Compare both the time saved and the interest saved.
Compare a lower rate
Use the Balance Transfer Savings Calculator when a promotional offer is available. Keep the same total monthly payment, then compare the transfer fee, promotional period, post-promotional APR, and total cost. The When a Balance Transfer Saves Money guide explains how to interpret the result.
Explore more calculators
- Credit Card Payoff Calculator Estimate payoff time, total interest, and payoff date.
- Credit Utilization Calculator See utilization now and after a planned payment.
- Extra Payment Calculator See how additional payments change time and interest.
- Cost of Delay Calculator Compare starting repayment now with waiting longer.
- Balance Transfer Savings Calculator Compare transfer fees, promotional APR, and savings.
- Debt Payoff Goal Calculator Find the payment needed to reach a target payoff date.
- Debt Snowball vs Avalanche Calculator Compare payoff order, interest, and completion time.
- Debt Consolidation Comparison Calculator Compare current debts with a consolidation loan.
Learn more about credit card interest
These guides explain how credit card interest builds over time, how repayment speed affects total borrowing cost, and why minimum payments can dramatically extend repayment.