Milo Quell

Free Tool

Credit Card Interest Calculator

See how long your balance takes to clear — and the true cost of the interest along the way.

$
%
$

Paid off in

2y 11m

35 monthly payments

Total interest

$1,860

Total paid

$6,860

Credit card interest compounds monthly, so a small payment can trap you for years. Every extra dollar goes straight at the balance and compounds in your favour.

Compounding, working against you

Credit card interest is compounding in reverse. The same force that grows an investment quietly multiplies a balance, and at typical APRs above 20% it does so fast. The reason minimum payments feel like running in place is that they barely clear the monthly interest, leaving the principal almost untouched.

This calculator makes the trap visible. Enter your balance, rate and payment and it runs the real month-by-month cycle, showing both how long you'll be paying and how much interest you'll hand over in total. Then nudge the payment up and watch the timeline collapse — it's the clearest argument there is for paying more than the minimum.

Frequently asked

How is credit card interest calculated?

Credit card interest is charged on your balance, usually compounded monthly. Each month the card applies a rate of roughly APR ÷ 12 to what you owe, adds it to the balance, and your payment is applied on top. This calculator runs that month-by-month cycle to show your payoff time and total interest.

Why does paying only the minimum take so long?

A minimum payment is often barely above the monthly interest, so very little goes toward the actual balance. That stretches repayment over years and multiplies the total interest. Paying even a little more each month dramatically shortens the timeline, because the extra attacks the principal directly.

What happens if my payment is too low?

If your monthly payment is less than the monthly interest, the balance grows instead of shrinking and the debt never clears. This calculator flags that case and shows the minimum payment you need to exceed just to start making progress.

How can I pay off credit card debt faster?

Pay more than the minimum, target the highest-APR card first, and avoid adding new charges while you repay. Even a modest increase in the monthly payment can cut months or years off the timeline and save a large share of the total interest.

Keep going

Juggling more than one debt? Build a full payoff plan across all of them.

Debt Payoff Calculator →
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