Credit Card Interest Calculator

In order to help you better understand the impact of interest, we built this credit card debt calculator. Enter your the details of your outstanding balances, interest rates, and the payments you’re making into the fields below. We’ll calculate for you the total interest you can expect to pay on your current obligations. If you would like to consolidate your credit card debt, or defer paying interest, consider applying for a balance transfer credit card.



interest (APR)

payoff time

You will pay a total of $0 in interest over this time.

Visualizing Your Debt Burden

To help you track how quickly your balance will be affected under your current payment plan, we graphed your progress over time below.


Credit Card Debt Calculator Methodology

Credit card interest kicks in on the remainder of your unpaid balance each month. For the above calculator, we assumed you begin with a set balance, and begin to pay it off over time. The interest for each month is equal to the periodic rate multiplied by your balance after a payment is applied.

The periodic rate varies month to month, depending on the number of days in a billing period. In order to approximate this, we divide the card APR by 12, to get a monthly periodic rate.

The interest rate is then added to the balance after payment, and carries over into the next month where the process is repeated.

Editorial Note: The content of this article is based on the author’s opinions and recommendations alone. It may not have been reviewed, approved or otherwise endorsed by the credit card issuer. This site may be compensated through a credit card issuer partnership.

These responses are not provided or commissioned by the bank advertiser. Responses have not been reviewed, approved or otherwise endorsed by the bank advertiser. It is not the bank advertiser's responsibility to ensure all posts and/or questions are answered.

Advertiser Disclosure: The products that appear on this site may be from companies from which ValuePenguin receives compensation. This compensation may impact how and where products appear on this site (including, for example, the order in which they appear). ValuePenguin does not include all financial institutions or all products offered available in the marketplace.

How We Calculate Rewards: ValuePenguin calculates the value of rewards by estimating the dollar value of any points, miles or bonuses earned using the card less any associated annual fees. These estimates here are ValuePenguin's alone, not those of the card issuer, and have not been reviewed, approved or otherwise endorsed by the credit card issuer.

Example of how we calculate the rewards rates: When redeemed for travel through Ultimate Rewards, Chase Sapphire Preferred points are worth $0.0125 each. The card awards 2 points on travel and dining and 1 point on everything else. Therefore, we say the card has a 2.5% rewards rate on dining and travel (2 x $0.0125) and a 1.25% rewards rate on everything else (1 x $0.0125).