TallyKnot

Credit Card Interest Calculator

Find out how long your credit card will take to pay off and how much interest you will pay on the way. Enter the balance, the APR and what you pay each month. Then see how paying a little more clears it far sooner. This uses a simple monthly-interest estimate, not your exact statement.

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Your card
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Time to pay off-
Total interest-
Total paid-

Falling balance

Month by month

A planning estimate using a simple monthly rate, not your exact statement.

Why credit cards are so expensive

Credit cards usually charge a high APR, and the interest is added to your balance every month. If you only pay a small amount, most of it goes on interest and the balance hardly moves — so the card lingers for years and costs far more than the original purchases.

Example. A balance of 1,200 at 0% APR with a 200 payment and no new spending clears in exactly 6 months with no interest. Raise the APR and the same payment takes longer and costs interest.

The quickest way out

  • Pay more than the minimum. Even a small extra each month goes straight to the balance.
  • Stop adding new spending to the card while you clear it.
  • Look for a lower rate, such as a balance transfer, if one is available to you.

Use the "Pay more / month" box to see how much time and interest a higher payment saves. To plan several debts together, try the Debt Payoff Calculator.

Frequently asked questions

How is credit card interest estimated here?

Each month the balance is charged one twelfth of the APR, any new spending is added, then your payment is taken off. This repeats until the card is cleared. Real cards often use daily balances and grace periods, so treat this as a planning estimate.

Why does my card take so long to pay off?

When your payment is only a little more than the monthly interest, most of it goes on interest and the balance barely moves. Paying more each month breaks that cycle — the extra goes straight to the balance.

What if my payment does not cover the interest?

If the payment is smaller than the monthly interest (plus any new spending), the balance grows instead of shrinking and the card is never paid off. The calculator shows a clear warning rather than an impossible date.

Should I add new spending?

Only if you will keep using the card. Any new monthly spending is added to the balance before the payment, which makes the payoff take longer. Leaving it at zero shows the fastest route out.

How is this different from the debt payoff tool?

This focuses on one card with a fixed payment and optional new spending. The Debt Payoff Calculator handles several debts at once and chooses an order to clear them.

TallyKnot Cashbook

Track your expenses every day, for free

A calculator gives you one answer. A cashbook shows you the whole picture: write down cash in and cash out, see where the money goes in charts and on a calendar, and share a ledger with your family, team or friends.

  • Use it right in your browser, no sign-up
  • With a free account: shared ledgers in sync on Android and the web
  • Charts, calendar view and categories