Where to find the rate
The interest rate is in your card statement or the card terms. It is usually quoted per month, and it differs between cards. Use the figure that applies to your card, not a number from an article.
What the estimate leaves out
This is a simple estimate. Some cards compound interest, charge fees or apply rates to cash withdrawals differently. The statement shows the exact amount, so check it before you decide how much to pay.
Questions people ask
Why does the calculator ask for a monthly rate?
Card statements usually show the interest as a monthly rate, so entering that figure matches what you see on the bill.
Can I avoid interest entirely?
On many cards, paying the full bill by its due date avoids interest on purchases. Check your card terms to confirm.
Is my card data stored?
No. The calculator runs in your browser and nothing you type is saved.