Our credit card interest calculator shows the total amount of interest you’ll pay if you carry a credit card balance from one month to the next.

You can toggle the calculator to see how much cumulative interest you’ll pay until the debt is repaid entirely, or how much interest you’ll pay within a specific repayment period.

Credit Card Interest Calculator

How the Credit Card Interest Calculator Works

Start by entering your current credit card balance and current credit card APR. We can use the calculator’s default figures, $4,500 at 15%, as an example.

You’ll then be given the choice to either calculate by average monthly payment or calculate by months to pay off. 

Let’s start with an average monthly payment of $150. Hit calculate, and the calculator will provide the total credit card interest charges you’ll pay between now and the time the card is paid off. In the example we’re using, you’d pay $1,180.59 in interest charges.

If you instead choose to calculate by months to pay off, you can determine the interest you’ll pay within a specific period of time. We’ll use the default time period of 12 months. When we hit calculate, we see that we’ll pay $373.95 in interest during that 12-month period.


You can use our credit card interest calculator to test out different repayment scenarios and to see how much you’ll save by making higher monthly payments. 

If increasing your monthly repayment amount won’t cut your interest down to a satisfactory level, don’t give up. Check out our recommended strategy for paying off credit card debt quickly.

Read more:

About the author

Total Articles: 143
Since 2009, Kevin Mercadante has been sharing his journey from a washed-up mortgage loan officer emerging from the Financial Meltdown as a contract/self-employed “slash worker” – accountant/blogger/freelance web content writer – on Out of Your Rut.com. He offers career strategies, from dealing with under-employment to transitioning into self-employment, and provides “Alt-retirement strategies” for the vast majority who won’t retire to the beach as millionaires. He also frequently discusses the big-picture trends that are putting the squeeze on the bottom 90%, offering work-arounds and expense cutting tips to help readers carve out more money to save in their budgets – a.k.a., breaking the “savings barrier” and transitioning from debtor to saver. He’s a regular contributor/staff writer for as many as a dozen financial blogs and websites, including Money Under 30, Investor Junkie and The Dough Roller.