Debt payoff toolkit

Balance Transfer Calculator

This balance transfer calculator models the fee, the intro period and the post intro APR, then compares the total cost against keeping your balance put. The honest answer, fee included.

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Debt free in2 years, 3 months
Transfer fee$225.00
Interest paid$237.69
Fee + interest total$462.69

Estimates only. Not financial advice. This calculator runs entirely in your browser and nothing you type leaves your device.

How a balance transfer really works

You move a balance from a high APR card to a new card offering 0% for an introductory period, usually 12 to 21 months. The catch is the transfer fee, usually 3 to 5 percent, added to the balance on day one. The second catch is the clock: whatever remains when the intro ends starts accruing at the regular APR. This balance transfer calculator models both, then compares the total cost against simply leaving the balance where it is. No cherry picking, just the full timeline.

A worked example

The numbers above: $7,500 transferred with a 3% fee ($225), 0% for 18 months, then 24.99%, paying $300 a month, versus keeping it at 24.99%. Transfer path: debt free in 2 years and 3 months, $237.69 in interest plus the $225 fee, $462.69 total cost. Keep the card: 3 years, $3,202.75 in interest. The transfer saves $2,740.05. Notice the fee is real money, $225, and the transfer still wins by a mile. That is the honest shape of a good transfer: fee paid, intro mostly used, savings overwhelming.

How transfers go wrong: three classic ways. One, new purchases on the transfer card accrue interest immediately at the full rate. Two, a single late payment can kill the intro APR on many cards. Three, the old card with its now empty limit becomes a temptation, and a year later there are two balances instead of one. Read balance transfer cards explained for the full playbook, and run your own payoff plan through the credit card payoff calculator too.

Frequently asked questions

How does the balance transfer calculator work?

Enter the balance, the transfer fee percent, the intro APR and months, the post intro APR, your monthly payment, and your current card APR. It simulates the intro period first, then the regular APR on whatever remains, adds the fee, and compares the total cost against leaving the balance on the current card.

Is a balance transfer worth the fee?

Compare the fee against the interest you would otherwise pay. A 3% fee on $7,500 is $225. If that buys 18 months at 0% instead of 24.99%, the math usually wins by thousands. This balance transfer calculator does that exact comparison, including what happens if you do not finish before the intro ends.

What happens if I do not pay off the transfer before the intro ends?

The remaining balance starts accruing at the regular APR, often in the mid twenties. The calculator models this: whatever is left after the intro months gets the post intro rate. The transfer can still win, but every month past the intro erodes the savings.

Do new purchases on a balance transfer card accrue interest immediately?

Often yes. Many cards charge the regular APR on new purchases from day one while the transferred balance enjoys 0%, and payments may go to the transfer first. The safe move: do not use the card for purchases during the intro period.

Can a late payment cancel the intro APR?

On many cards, yes: one late payment can end the promotional rate early. Automate at least the minimum and treat the intro deadline like a hard wall. Miss it and the savings evaporate.

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