Balance Transfer Calculator

What this calculator answers

A balance transfer sounds like free money. Move your credit card debt to a new card with a low or zero percent rate, and stop bleeding interest. But there is almost always a transfer fee, and the low rate does not last forever, so the real question is not whether it sounds good. It is whether, after the fee, you actually come out ahead.

That is exactly what this tool works out. It takes what your current card is costing you in interest and compares it against what the new card would cost, fee and all, over the time you need. Then it tells you plainly whether the move saves you money or quietly loses it.

How a balance transfer works, and how the tool compares it

The idea is simple. You have a balance sitting on a card charging a high rate. Another card offers to take that balance over at a much lower promotional rate, usually for a fee that is a percentage of the amount you move. If the interest you save beats the fee you pay, you win.

The calculator puts the two side by side. On the old card, it works out the interest cost of carrying your balance at the old rate over the period. On the new card, it adds the transfer fee to the interest at the promotional rate over the same period. Compare the two totals and you have your answer. It is a clean, direct cost comparison of old against new, which is the honest way to judge whether a transfer is worth the effort.

A worked example: is the transfer worth it?

Say you owe 5,000 on a card charging 22%, and you are looking at a new card with a 0% promotional rate and a 3% transfer fee, and you want to clear it over 12 months.

On the old card, carrying that 5,000 at 22% for a year costs about 1,100 in interest. On the new card, the cost is the 3% fee on 5,000, which is 150, plus zero interest during the promo. So the new card costs 150 against the old card's 1,100. The transfer saves you about 950 over the year. To clear the balance in that 12 months, you would pay roughly 429 a month.

That is a clear win, and it is a win precisely because the fee (150) is far smaller than the interest you were paying (1,100). The tool will just as happily tell you the opposite: if the fee and the new rate together cost more than staying put, it says so, and tells you how much you would lose.

The fee, and the clock

Two things decide whether a balance transfer pays off, and both deserve your attention.

The first is the fee. A transfer fee is usually a percentage of the balance you move, often around 3 to 5 percent. On a big balance that is real money up front, so the interest you save has to clear that hurdle before you gain anything.

The second, and the one that catches people, is the clock. That tempting 0% is a promotional rate, and it only lasts a limited time. When the promo period ends, the rate jumps, often to something high, and any balance still sitting there starts costing you again. The CFPB also warns of a sharp edge in the fine print: if you fall more than 60 days behind on a payment, the card company can raise the rate on your whole balance, including what you transferred. So a balance transfer only really works if you have a genuine plan to pay the balance down before the promotional rate expires.

Promotional period or long-term use

The calculator has two modes, because there are two honest ways to think about a transfer.

Promotional period assumes you will clear the balance within the low-rate window. You give it the old rate, the amount, the fee, the promo rate, and the months you need. This is the mode for the plan above: get in, pay it off, get out before the rate changes.

Long-term use is for when the balance will outlive the promo. Here you also enter how long the promo lasts and the final rate that kicks in afterward, so the comparison accounts for the cheap months and the expensive ones that follow. This is the more realistic mode if you know the balance will not be gone by the time the promo ends, and it keeps you honest about the true cost once the rate resets.

How to use it

First pick your mode at the top, then fill in the fields it shows:

• Old rate. The interest rate on your current card.
• Amount to transfer. The balance you would move.
• Transfer fee. The new card's fee, as a percentage of the amount.
• Promotional rate and Time required. The new card's promo rate and how many months you plan to take.
• Promotional period and Final rate. In long-term mode, how long the promo lasts and the rate that applies afterward.

Press Calculate to see the old cost, the new cost, and the verdict. Press Reset to clear it.

Questions people ask

Is a balance transfer worth it?

It is worth it when the interest you save on the lower rate beats the transfer fee, and when you can pay the balance down before the promotional rate ends. Run your own numbers here: if the new cost is lower than the old, you come out ahead.

How much is a transfer fee?

It is usually a percentage of the balance you move, commonly around 3 to 5 percent. On a 5,000 transfer, a 3% fee is 150, which the interest savings need to beat for the move to pay off.

What happens when the 0% period ends?

The rate rises, often sharply, and any remaining balance starts accruing interest at that higher rate. That is why a transfer works best when you clear the balance before the promo expires. Falling 60 days behind can also trigger a penalty rate on the whole balance.

References

The description of balance transfers, transfer fees, promotional rates, and the risk that a late payment can raise the rate on your whole balance follows the U.S. Consumer Financial Protection Bureau's consumer materials on credit cards.

1. Consumer Financial Protection Bureau. Credit card key terms (balance transfer, fees, promotional rate). consumerfinance.gov
2. Consumer Financial Protection Bureau. Credit cards: tools and resources. consumerfinance.gov