HisabCalc › Banking & money

Credit Card Interest Calculator

Estimates the interest charged on an unpaid credit card balance using the daily rate method and shows the new balance if nothing is repaid.

Enter your numbers

Outstanding balance

Example: 45250

Annual interest rate

Example: 36

Billing cycle days

Example: 30

Result

Currency

Figures are computed on your device; nothing is sent anywhere.

Formula

dailyRate = annualRatePercent/100/365; interest = outstandingBalance * dailyRate * billingDays; newBalance = outstandingBalance + interest

How the calculation works

Card issuers convert the annual rate into a daily rate and multiply it by the number of days the balance stays unpaid, so a longer cycle always costs more.

The estimate assumes no new purchases and no repayment during the cycle, which is why real statements often differ once transactions are added.

Common mistakes

Paying only the minimum due and thinking it stops interest, when the remaining balance keeps accruing daily interest every single day.

When to use it

Use it to see the true cost of carrying a balance for one cycle before you decide to pay in full or take a loan instead.

Worked example

On a balance of 45250 at a 36 percent annual rate over a 30 day billing cycle, the interest is 1338.90 and the new balance is 46588.90.

Interest charged ৳1,338.90

New balance 46,588.90

Common questions

Is this the same as the APR on my statement?

The APR usually adds fees on top of the nominal rate, so the interest here can be slightly lower than what the statement shows.

Last updated: 2026-10-04