Credit Card Interest Calculator

How credit card interest works

When you do not pay the full outstanding amount by the due date, the bank charges interest on the balance (and sometimes on new purchases from the transaction date). Interest is usually calculated monthly at APR ÷ 12. Each month: the balance grows by interest, then your payment is applied; the remainder carries forward. Paying only the minimum due keeps the account current but can take years to clear the debt and cost a lot in interest—credit card APRs in India are often 24–48% per year.

To avoid interest entirely, pay the full outstanding by the due date (grace period). If you already have a revolving balance, use this calculator to see how long it will take to pay off and how much interest you will pay for a given monthly payment. Increasing the payment even slightly can save a lot of interest and shorten the payoff period.

Example: ₹50,000 at 24% APR, ₹5,000/month

Outstanding balance ₹50,000, card APR 24%, and you plan to pay ₹5,000 every month. First month interest ≈ ₹1,000 (24% ÷ 12 × 50,000). After the payment, the balance drops; each month interest is on the lower balance. If you pay ₹5,000 every month, you will clear the balance in about 11 months and pay roughly ₹3,000–4,000 in total interest. If you paid only the minimum (e.g. 5% of balance), it could take years and cost much more. Increase the monthly payment to save interest and get debt-free sooner. Use the calculator above with your balance, APR, and planned payment to get exact months and total interest.

Benefits of Using This Calculator

A credit card interest calculator shows how long it takes to pay off your balance and how much interest you pay for a given monthly payment, so you can see the true cost of revolving debt and the benefit of paying more than the minimum. It helps you plan extra payments and compare different payoff amounts (e.g. ₹5,000 vs ₹7,000 per month).

Seeing the total interest often motivates people to pay down the balance faster. Use it together with our Debt Payoff Calculator if you have multiple debts—you can decide to put extra toward the card with the highest APR first (avalanche method) to minimize total interest.

How to Use This Calculator

Enter your current outstanding balance and the card’s APR (annual percentage rate). Enter the fixed monthly payment you plan to make. The calculator shows how many months to payoff and total interest. Increase the payment to see how much you save in interest and how many months you can cut. Pay in full by the due date to avoid interest; use this calculator when you already have a revolving balance and want to plan payoff.

If you have multiple cards, use the Debt Payoff Calculator to prioritize the highest-APR card and see the combined payoff timeline.

FAQs