Credit Card Repayment Calculator
Enter the balance and the APR, then either what you can pay each month or when you want to be clear.
This is an estimate to help you plan and not advice. Assumes no new spending on the card and the same payment every month.
Worked examples
A £3,000 balance at 22.9% APR
£3,000, 22.9% APR, £100 a month
43 months, £1,271 interest
Interest of about £52 is added in the first month before the payment is taken off.
Aiming for 24 months
£3,000 at 22.9% APR, 24 months
£153.86 a month
The standard repayment formula at the monthly rate.
About Credit Card Repayment Calculator
Paying only the minimum on a credit card keeps the balance around for years, while interest builds up month after month. Knowing exactly how long a balance will take to clear, and what the interest adds up to, is the first step to deciding how much to pay. This calculator gives you both numbers from the balance, the card's APR and a monthly payment.
It also works the other way. If you want to be clear in 12 or 24 months, switch to the second option and enter the number of months, and the page shows the monthly payment that gets you there. Interest is worked out each month at the monthly equivalent of the APR, and the page warns you if a payment is too low to cover a single month of interest.
How to use Credit Card Repayment Calculator
- Enter the balance on the card and its APR.
- Choose whether to start from a monthly payment or from a number of months.
- Type in the payment or the months.
- Read the time to clear, the interest and the total repaid, then try a larger payment.
Common uses
- Seeing what the minimum payment really costs
- Planning how much to pay to clear a card by a holiday or year end
- Comparing the cost of a balance transfer fee with the interest saved
- Checking how much a small increase in payment saves
Sources
Last reviewed 18 October 2026.
Frequently asked questions
How is credit card interest worked out here?
The APR is converted to a monthly rate that compounds to the stated APR over a year. Each month interest is added to the balance, then your payment is taken off. Real cards work out interest daily and the dates of purchases and payments matter, so the lender's figure may differ a little.
What if my payment is lower than the interest?
Then the balance never falls. The page tells you the least you must pay so the balance starts to go down.
Does the calculator assume I stop spending on the card?
Yes. New purchases add to the balance and change the answer, so use this for a balance you are working to clear.
How much does paying a little extra save?
More than most people expect. Try raising the payment by £20 or £50 and see the months and interest fall together.
Is a balance transfer worth it?
It can be, if the fee is lower than the interest you would save during the introductory period with no interest and you clear the balance before it ends. Use this page to compare the interest at your current APR with the fee.