Is your money being sucked into a compound interest sinkhole? If you’re not paying off your credit cards every month, that’s just what can happen. It depends on the interest rate charged by the credit card company and whether you pay as much as you can, or just the minimum amount due.

The minimum payment on credit card debt is calculated as a percentage of your current balance. The minimum payment drops as your balance is paid, but thanks to the magic of compounding, you’ll end up paying for a long, long time.

Check out how much interest you’ll shell out over the life of the debt by using our calculator. Enter the information below to see the difference in time and money your payment can make!