Credit Card Interest Calculator
Focus on interest dollars — not just months to zero — with balance, APR, and the payment you plan to make. Click any i for detail.
Card balance
Balance ($)
i
Balance
Statement balance you are paying down. |
|
|---|---|
APR (%)
i
APR
Purchase APR if paying down purchases. |
|
Monthly payment ($)
i
Payment
Fixed amount you pay each month. |
How to use this calculator
- Enter balance and APR.
- Set planned payment.
- See first-month interest and payoff interest total.
Results explained
Headline is interest in the first month on the full balance; breakdown shows total interest if that payment continues.
Quick reference: card interest
Simplified fixed APR.
| Item | Detail |
|---|---|
| Month-1 interest | Balance × APR ÷ 12 |
| Payoff interest | Sum from simulation |
Daily balance method and new charges change real bills.
How the estimate is built
First-month interest = balance × monthly rate; payoff path uses fixed-payment amortization simulation.
Example scenario
$6,400 at 24.99% accrues about $133 interest in month one if the balance starts full; a $200 payment still leaves substantial total interest over the payoff path.
FAQ
Why not minimum payment?
Minimums shrink slowly — this uses your chosen payment.
Promo 0% APR?
Use the purchase APR that will apply to the balance you are modeling.
Payoff months tool?
See the credit card payoff calculator for target-month payment sizing.