It depends on how much debt you have and what interest rates you’re currently paying, but figuring out how much you can save requires two calculations: How much it would cost to transfer your balance and pay it off before the end of the introductory APR, and how much it would cost to pay down the balance on your existing card in the same time frame. Here’s an example of a savings opportunity: Say you want to transfer a $10,000 credit card balance with a 0% APR balance transfer offer for 12 months. The balance transfer carries a 3% fee, and on your current card, that balance has an 18% APR. If you didn’t transfer the balance but paid off your debt within 12 months, you’d pay a total of $10,926—$10,000 of principal and $926 of compound interest you accrue while you’re paying down the balance. If you transferred the balance, you’d incur a $300 fee (3% of $10,000). But, if you pay the whole debt off by the end of that 12-month 0% APR period, your total cost would remain $10,300. Transferring the balance and paying off the entire debt allows you to save $626.