💳 Balance Transfer Calculator

A 0% balance transfer can wipe out years of credit card interest — or just add a 3-5% fee to debt you still won't pay off. The difference is arithmetic: fee versus interest saved, and whether your monthly payment actually clears the balance before the promo rate expires. This calculator runs both futures side by side.

Credit card balance to transfer ($) Current card APR (%) Balance transfer fee (%) (typically 3-5% of the amount moved) 0% promo period (months) (commonly 12, 15, 18 or 21) APR after the promo ends (%) (the 'go-to' rate in the offer) What you'll pay per month ($)

The trade: one fee now instead of interest every month

A balance transfer moves debt from a card charging 20-30% APR to a new card charging 0% for a promotional window — usually 12 to 21 months — in exchange for a one-time fee of 3-5% of the amount moved. On a $6,000 balance at 25% APR, interest runs about $125 a month; a 3% fee is $180 once. If the transfer buys you even two months of avoided interest, you're ahead — provided the balance actually shrinks during the window.

The one number that decides everything

Divide the transferred balance (including the fee) by the promo length. That's the monthly payment that reaches zero the month the 0% rate dies. $6,180 over 15 months is $412/month. Pay that and the fee is your only cost. Pay half of it and you'll face the leftover at the card's go-to rate — typically 25-30%, often higher than the card you left. The calculator shows this target payment for your numbers; treat it as the real price of admission before you apply.

Traps that turn a good deal bad

New purchases usually aren't 0%. Many transfer cards charge full APR on new spending — and until the promo balance is paid, payments often go to the 0% portion first (minimums, at least). Use the transfer card for the old debt only; put daily spending elsewhere.
One late payment can void the promo. Card agreements commonly allow the issuer to cancel the 0% rate after a missed payment. Set up autopay for at least the minimum on day one.
The clock starts at account opening, not when the transfer posts. Transfers can take 1-2 weeks; keep paying the old card until you see the balance move, or a late fee lands on top of everything.
Deferred interest is a different product. Store-card "no interest if paid in full" offers charge back all the interest from day one if any balance survives the window. True bank balance-transfer cards don't do this — but read which one you're holding.
The debt spiral risk is behavioral. The classic failure: transfer the balance, feel relief, and run the old card back up. Now there are two balances. Close or freeze the old card if that pattern sounds familiar.

Balance transfer vs the alternatives

A transfer is one of three standard moves against card debt. A consolidation loan (fixed rate, fixed term — modeled in the debt consolidation calculator) suits balances too large to clear in 18 months, trading 0% for certainty. Aggressive paydown in place — ordered by the snowball vs avalanche calculator — avoids new credit entirely. If you're juggling several cards, transfers help most when the weighted rate across them is high and the total is clearable within a promo window. And after the dust settles, the credit card payoff calculator keeps the remaining plan honest.

What it does to your credit score

Short term: a hard inquiry (a few points, fades in months) and a new account lowering your average age. Working in your favor: the new card's credit line drops your overall utilization ratio — often the bigger effect. The score dip is usually modest and temporary; carrying 25% APR debt for years is the costlier problem. One practical note: issuers rarely approve transfers between their own cards (Chase to Chase won't fly), and transfer limits may be below your full balance — moving part of the debt still helps, just run the numbers on the remainder.

Frequently asked questions

Is a balance transfer fee ever waived?

A few cards offer no-fee transfers (often credit-union cards, or intro no-fee windows in the first 60 days), but they usually pair with shorter 0% periods. A 3% fee with 18 months at 0% frequently beats a no-fee card with 6 months — total cost over the whole payoff is what matters, which is exactly what this calculator compares.

Does transferring a balance hurt my credit score?

Slightly and briefly: a hard inquiry and a new account each shave a few points. But the added credit line typically lowers your utilization ratio, which helps. Most people who pay the debt down see their score higher within a few months than where it started.

Can I transfer a balance between two cards from the same bank?

Almost never — issuers block transfers between their own products, since they'd be paying themselves. Pick a card from a different bank than the one holding your debt.

What happens if I don't pay it off before the 0% period ends?

The leftover balance starts accruing at the card's go-to APR (often 25-30%) from that point forward. With a true balance-transfer card there's no retroactive interest — that 'charge it all back' behavior belongs to deferred-interest store financing, a different product. Still, the go-to rate is usually worse than what you left, so plan the payment to finish inside the window.

How much can I actually transfer?

Up to the new card's transfer limit, which is often 75-100% of the credit line — and the line itself depends on your income and score. If approval comes in below your balance, transfer what you can: cutting the 25% APR portion of your debt in half still saves real money.

This calculator is for educational purposes only and does not constitute financial advice. Results are estimates based on the inputs and assumptions shown.