A 0% balance transfer offer isn’t automatically a good deal — the transfer fee is real money paid upfront, and the whole trade only pays off if the balance actually clears before the promotional period ends.
How it works
Transfer fee and required payment
fee = balance × fee% · payment needed = balance ÷ promo months
At 0% APR during the promo period, the fixed payment required to clear the balance in time is simply the balance divided evenly across the remaining promotional months.
The whole trade only pays off inside the promo window
A 0% offer that expires before the balance is paid off reverts to the card’s standard ongoing APR — often higher than the original card’s rate — applied to whatever balance remains. That can turn a money-saving move into a costly one. This calculator checks directly whether your planned payment actually clears the balance in time, rather than assuming it will.
How to use this calculator
- Enter your current balance and its current APR.
- Enter the new card’s transfer fee and promotional period length.
- Enter what you actually plan to pay each month, and check whether it’s enough.
Frequently asked questions
Why does the fee matter if the interest rate drops to 0%?
Because the fee is a real cost, typically 3–5% of the balance, charged upfront regardless of how much interest you end up saving — the net benefit is the interest avoided minus that fee, not the interest avoided alone.
What happens if I can’t pay enough to clear it in time?
Whatever balance remains when the promo ends starts accruing interest at the new card’s standard ongoing rate — often significantly higher than a typical card’s rate, which can undo much or all of the benefit of transferring in the first place.
Should I close my old card after transferring the balance?
That’s a separate decision with its own trade-offs (affecting your available credit and credit history length) that this calculator doesn’t address — it focuses purely on the interest and fee math of the transfer itself.
Does this account for new purchases on the new card?
No — this models paying off the transferred balance only. New purchases on the same card often don’t get the same 0% treatment and can complicate how payments are applied; check your specific card’s terms.
Is a longer promotional period always better?
Generally it gives more room to pay off the balance comfortably, but check whether a longer promo period comes with a higher transfer fee — that trade-off varies by offer, and this calculator lets you compare different offers by changing the fee and promo-length inputs.
