Balance Transfer Calculator
Compare the cost of paying off your current credit card vs transferring the balance to a new card with an introductory 0% APR. Factor in the transfer fee and post-intro APR to determine total savings.
A balance transfer is a credit card industry promotion — move debt from one card (usually high-rate) to another card that charges 0% interest for a fixed introductory period, typically 12 to 21 months. In exchange, the new issuer charges a one-time transfer fee, usually 3% to 5% of the amount transferred.
The math is simple in principle: you're trading interest charges for a fee. The trade is worth it only if the interest you would have paid is larger than the fee, and only if you can pay the balance down meaningfully before the introductory rate expires and the post-intro APR — often 20%+ — kicks in on whatever remains.
This calculator runs both scenarios in parallel. It amortizes your existing balance at your current APR with your stated monthly payment, then simulates a transfer (balance plus fee) at the intro rate for the intro period and the post-intro rate after, with the same monthly payment. The difference is your true savings. It only works in your favor if you treat the intro period as a deadline, not a vacation.
Inputs
Results
Total Savings
$2,356
Transfer Fee
$240
Current Interest Cost
$3,083
Transfer Interest Cost
$487
Total Cost Comparison
Transfer Cost Breakdown
Formula
How to use this calculator
- Enter your current credit card balance. Use the actual statement balance, not the available credit limit.
- Enter your current card's APR. This is the annual percentage rate the card charges on revolving balances, listed on every statement.
- Enter the monthly payment you will commit to. Make it a real number you can sustain — the comparison breaks if you only make minimum payments.
- Enter the balance transfer fee. 3% is the most common starting point; cards with longer intro periods often charge 5%. A few cards occasionally run no-fee promotions.
- Enter the intro APR (almost always 0% for true balance-transfer cards) and the intro period length — 12, 15, 18, or 21 months are common.
- Enter the post-intro APR. This is the regular APR that applies once the promo period ends. Read the card disclosure carefully — it is usually 18–26% and applies to whatever balance remains.
- Compare total cost under both paths. The savings number includes the transfer fee.
- If the math is close, ask whether you can actually pay off the full balance within the intro period. If yes, the transfer is a clean win. If not, the post-intro APR can wipe out the savings on the remaining balance quickly.
Worked examples
Aggressive payoff within the intro period
Balance: $8,000 at 22% APR, paying $600/mo Current path: pays off in ~15 months, total paid ≈ $8,950 ($950 interest). Transfer (15 months, 0%, 3% fee, 20% post-intro): pays off completely in 14 months at 0%. Total paid: $240 fee + $8,000 = $8,240. Savings: $710. The transfer wins because the entire balance clears before the post-intro rate kicks in.
Same balance, slower payment — risk of leftover
Balance: $8,000 at 22% APR, paying $300/mo Current path: pays off in 33 months, total interest ≈ $1,830. Transfer (15 months, 0%, 3% fee, 20% post-intro): $4,500 paid during intro at 0%. Remaining balance: $3,740. At 20% APR with $300/mo: 14 more months, ~$510 interest. Total cost: $240 fee + $8,000 + $510 = $8,750. Savings: $1,080. Still positive, but more than $500 in interest still gets paid post-intro.
When the transfer loses money
Balance: $3,000 at 22% APR, paying $150/mo, transfer fee 5%, intro 12 months at 0%, post-intro 24% Current path: pays off in ~25 months, total interest ≈ $670. Transfer: $150 fee + $1,800 paid during intro. Remaining: $1,200 at 24% APR with $150/mo → ~9 months, $115 interest. Total: $150 + $3,000 + $115 = $3,265. Savings: $135. The 5% fee on a small balance ate most of the benefit, and the high post-intro rate finished the rest. Below ~$4,000 of debt and at high fees, the math often fails.
When to use this calculator
Use this calculator before applying for a balance transfer card, not after. Application is a hard credit pull and the card can be denied — knowing the math says it's worth it changes whether the inquiry is worth taking.
A balance transfer is most powerful when you have a clear payoff plan: a known amount of cash you can dedicate each month, an intro period long enough to retire most of the balance, and a fee that is much less than the interest you'd pay on the original card. It is most dangerous when used as a way to lower the monthly payment with no payoff intent — at the end of the intro period, you're back to a high APR with a similar balance and you've also paid the fee.
Adjacent tools: the credit-card-payoff calculator shows what an aggressive plan looks like on your existing card alone. The debt-consolidation calculator compares a personal loan instead of a balance transfer — for larger balances or longer time horizons, a fixed-rate personal loan is often the better instrument.
Common mistakes to avoid
- Continuing to use the old card after transferring the balance. The point is to stop the interest accrual, but new charges on either card during the intro period sabotage the plan.
- Making only minimum payments during the intro period. Most cards require interest-bearing minimum payments, and the intro 0% is not actually 0% if the balance is still there when the promo ends.
- Missing a payment. A single late payment can void the intro APR on most cards and trigger a penalty APR (often 29.99%) on the entire transferred balance immediately.
- Ignoring the transfer fee in the savings calculation. A 5% fee on $10,000 is $500 — that has to be subtracted from interest saved before claiming a win.
- Transferring within the same issuer. Most banks will not let you transfer a balance between two of their own cards. Targeting a different bank is required.
- Treating the new card's credit limit as new spending power. The transferred balance counts against the limit, and the issuer may set the limit below your transferred amount — leaving you with a leftover at the original card.
Frequently Asked Questions
Sources & further reading
- Balance transfer cards — what to know before you apply — U.S. Consumer Financial Protection Bureau
- Credit Card Accountability Responsibility and Disclosure (CARD) Act overview — U.S. Consumer Financial Protection Bureau
- Credit card surveys and Schumer-box disclosure rules — Board of Governors of the U.S. Federal Reserve