The two costs a balance transfer really has
A 0% balance transfer can be one of the cheapest ways to kill credit-card debt — but only if you account for the two things the headline offer glosses over. First, the up-front transfer fee, typically 3–5% of the balance, added to what you owe on day one. Second, thego-to APR: whatever balance survives the promo starts accruing the standard rate, which is often just as punishing as the card you left. This calculator folds both into the comparison so the net savings figure is the real one.
The fee math
Starting balance = balance + balance × fee%
A 3% fee on $8,000 is $240, so you begin the promo owing $8,240. The transfer only pays off if the interest you avoid at 0% is larger than that fee plus any interest charged once the go-to APR takes over.
What makes this calculator different
- It counts the transfer fee. Most calculators pretend the transfer is free. We add the fee to your balance and to the total cost — because that’s where it lands in real life.
- It models the go-to APR. If your payment can’t clear the balance inside the 0% window, the leftover accrues the post-promo rate. We simulate that month by month instead of assuming you’re done.
- It tells you the payment to beat the clock. See the exact level monthly payment that zeroes the balance before the intro period ends — so you never touch the go-to APR.
- Honest net savings. Stay vs. transfer, side by side, with a clear warning when the fee makes transferring the worse deal.
Frequently asked questions
How does a balance transfer work?+
You move debt from a high-rate card to a new card offering a low or 0% promotional APR for a fixed period — often 12 to 21 months. During that window, payments attack the principal instead of disappearing into interest, so the same monthly payment clears the balance far faster. The catch is that the promo rate is temporary: whatever balance is left when it ends starts accruing the card’s standard "go-to" APR.
How is the transfer fee calculated, and why does it matter?+
Most balance-transfer offers charge an up-front fee of 3% to 5% of the amount you move, and that fee is added straight onto your new balance. On an $8,000 transfer, a 3% fee is $240 — so you actually start owing $8,240. Basic calculators ignore this entirely. This one adds the fee to your starting balance and counts it as a real cost, because a fat fee can wipe out the interest you’d save.
What happens when the 0% intro period ends?+
Any balance still outstanding when the promo expires begins accruing the go-to APR, which is frequently as high as the rate you transferred away from. That’s why the most important number isn’t the headline 0% — it’s whether your payment is large enough to clear the balance before the window closes. This calculator shows you the exact level payment needed to ride the promo all the way to zero.
Does a balance transfer hurt my credit score?+
Opening a new card triggers a hard inquiry and lowers the average age of your accounts, both small short-term dings. But a transfer also lowers utilization on the original card, which can help. As long as you keep the old account open and don’t run the balance back up, most people see their score recover and often improve as the balance falls. Missing the minimum payment, by contrast, will cost you the promo rate and damage your credit.
When is a balance transfer NOT worth it?+
When the transfer fee plus any post-intro interest costs more than you’d pay just staying put. That happens when the rate gap is small, the fee is high, or your payment is too low to clear much of the balance before the go-to APR kicks in. It’s also a poor idea if the new card tempts you into fresh spending. Enter your numbers above — if the net savings come out negative, staying put is the cheaper move.
Disclaimer: This calculator is for educational purposes only. Actual fees, promotional terms, go-to rates, and eligibility vary by issuer and credit profile, and interest is calculated differently across cards. It is not financial advice.