Balance Transfer Calculator

Last updated July 2, 2026

A balance transfer moves existing credit card debt to a new card with a promotional 0 percent APR period — typically 12 to 21 months — allowing the borrower to pay down principal without accumulating additional interest during the promotional window. The transfer fee of 3 to 5 percent of the transferred amount is the upfront cost; the savings are measured against what the interest would have cost if the debt remained on the original card at its standard APR. For a $7,000 balance at 22 percent transferred with a 3 percent fee and a 15-month 0 percent period, the break-even comes quickly: three months of avoided interest at $128 per month more than offsets the $210 transfer fee.

The balance transfer strategy works only when executed with discipline. The card must be used exclusively for the transferred balance — no new purchases, which accrue interest at the card's standard rate and can complicate the payoff calculation. The balance must be paid in full before the promotional period ends; any remaining balance at month 16 or 22 begins accruing interest at the card's regular APR, which typically runs 18 to 29 percent. And the original card, once freed up, should not be rebuilt with new spending. Balance transfer calculators are most useful when they show both the best-case scenario — full payoff within the promotional period — and the worst-case cost of only partial payoff followed by a return to standard rates.

A balance transfer makes sense when: the transfer fee is recouped within two to three months of avoided interest, you have a concrete month-by-month payment plan that zeroes the balance before the promotional period ends, and you have the discipline to avoid new purchases on the card. Run the calculator with both the optimistic and the incomplete-payoff scenarios to understand both the potential savings and the cost of falling short.