Balance Transfer Calculator

The calculation hinges on comparing the total cost of keeping your balance on your current card versus moving it to a new card. For a standard new card, the total cost (NewCreditCardCost) is calculated by adding the upfront transfer fee—typically a percentage of the transferred amount—to the interest accrued over your target payoff timeframe: NewCreditCardCost = (AmountToTransfer × TransferFee / 100) + (AmountToTransfer × NewRate / 100 × (NumberOfMonths / 12)). This is compared against the OldCreditCardCost, which is simply the interest that would accrue on your current card over the same period: OldCreditCardCost = (AmountToTransfer × OldRate / 100) × (NumberOfMonths / 12)). For promotional introductory rates, a tiered formula splits the payoff timeline into the initial teaser rate period and the final standard rate period.

Imagine you have a credit card balance of $5,000 charging an old interest rate of 22% per year. You plan to pay this off over 12 months. Your current card cost would be: $5,000 × 0.22 × (12 / 12) = $1,100 in total interest. Now, suppose you transfer this $5,000 to a new card offering a 0% introductory rate for 12 months, but with a 3% balance transfer fee. Your new card cost is calculated as: Transfer fee of ($5,000 × 0.03 = $150) plus interest of ($5,000 × 0% × 1 = $0), totaling $150. By subtracting the new card cost from the old card cost ($1,100 - $150), you discover a net savings of $950 by executing the balance transfer.

Always factor the balance transfer fee into your savings equation, as a 3% to 5% upfront fee can occasionally outweigh small interest rate reductions. Aim to choose a promotional payoff period that comfortably matches your realistic monthly budgeting capabilities. Finally, avoid making new purchases on a balance transfer card, as many cards do not offer a grace period on new purchases when carrying a transferred balance.