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Balance Transfer Cost Calculator

Work out what a credit card balance transfer really costs by adding the upfront transfer fee to the interest paid after the promotional period ends.

Enter your numbers

Example: 120000

Example: 3

Example: 6

Example: 24

Example: 18

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

Formula

transferFee = balance * transferFeePercent / 100; principal = balance + transferFee; balAfterPromo = principal - (principal / repayMonths) * promoMonths; postPromoInterest = EMI over (repayMonths - promoMonths) on balAfterPromo; totalCost = transferFee + postPromoInterest; effectiveCostPercent = totalCost / balance * 100

How the calculation works

The transfer fee is charged up front on the whole balance, so it is added to the debt before any repayment begins.

During the interest free window your equal instalments cut the balance, which shrinks the amount that later attracts interest.

When the promo ends the leftover balance is repaid at the standard rate, and its interest plus the upfront fee is what the switch really costs.

Common mistakes

When to use it

Worked example

Transferring 120,000 at a 3 percent fee with a 6 month interest free period and 24 percent afterwards over 18 months costs a 3,600 fee, 11,100.53 in post promo interest, 14,700.53 in total and an effective cost of 12.25 percent.

Transfer fee 3,600.00
Post promo interest 11,100.53
Total cost ৳14,700.53
Effective cost % 12.25

Common questions

Does the transfer fee earn interest too?

Yes, the fee is added to the transferred balance, so it is repaid with the debt and effectively attracts the same rate after the promo ends.

Last updated: 2026-10-04