Credit Card Balance Transfer Calculator
Compare what you'd pay by staying put versus transferring your balance — fees included — to see your real net savings.
Updated · Published · Built by Ali Ahmad, Founder
Calculation method: This calculator uses a simplified monthly-interest model (APR ÷ 12). Credit-card issuers may calculate interest using daily periodic rates and average daily balances, so your actual statement may differ. See our methodology.
Credit Card Balance Transfer Calculator
A balance transfer may be worth it when the interest you'd save is greater than the transfer fee (often 3-5% of the amount moved). The calculator above compares the total cost of staying on your current card with the cost of transferring, fee included, at the same monthly payment.
"0% APR for 15 months" looks like an obvious win, but the fee changes the math — and if you can't pay off the balance before the promo ends, the savings can shrink quickly. This calculator nets everything out before you apply.
How the Calculator Works
Enter your balance, your current APR, what you can pay each month, and the offer's terms: fee percentage, promotional APR, promo length, and the APR after the promo ends. The calculator then runs two simulations at the same monthly payment:
- Stay put: your balance paid down at your current APR.
- Transfer: the fee is added to the balance, the promotional rate applies for the promo months, and the go-to APR applies afterward.
Your estimated net savings = interest if you stay − (interest after transferring + transfer fee).
Formula
Transferred Balance = Balance + Transfer Fee
Monthly Interest = Balance × (Promo APR ÷ 12) during the promo, then × (Go-to APR ÷ 12)
Net Savings = Interest (stay) − [Interest (transfer) + Transfer Fee]
This is a simplified estimate, not an issuer-specific statement calculation.
Example: $6,000 at 24.99% APR, paying $300 a month
The offer: 3% fee, 0% for 15 months, then 24.99%. The fee is $180, so the new balance starts at $6,180.
| Scenario | Months to payoff | Interest | Fee | Total cost |
|---|---|---|---|---|
| Stay on current card | 27 | $1,841.44 | $0.00 | $1,841.44 |
| Transfer (0% for 15 months) | 22 | $124.90 | $180.00 | $304.90 |
After 15 payments of $300, about $1,680.00 remains and starts accruing interest at 24.99%. Even so, the transfer costs about $305 versus $1,841 for staying put — an estimated saving of about $1,537. Paying $412 a month ($6,180 ÷ 15) would clear it before the promo ends.
When the Result May Differ
Treat the results as a planning estimate. Your real numbers can differ because of:
- Daily periodic rate: many issuers apply APR ÷ 365 (or 360) each day instead of APR ÷ 12 once a month, which can produce different interest.
- Average daily balance: your balance moves during the cycle as purchases post and payments arrive; this calculator uses a single month-start balance.
- New purchases: the estimate assumes you stop adding charges. Any new spending lengthens payoff and raises interest.
- Different APR categories: purchases, balance transfers, cash advances, and penalty APRs can carry different rates on the same card, and how payments are allocated between them affects the total.
- Promo terms: under federal rules an issuer can generally end a promotional rate on your existing balance early only if your minimum payment is more than 60 days late (Regulation Z § 1026.55), and some offers (especially retail financing) use deferred interest, which can charge interest back to the start if the balance isn't paid in full by the deadline.
- Fee structure: some cards charge a percentage with a minimum dollar amount; others charge a different fee after an introductory window.
- Credit limit: the new card's limit may be lower than the amount you want to move, which would leave part of the balance on the old card.
- New purchases on the new card: these may accrue interest at the purchase APR and may not get a grace period while a transferred balance remains, depending on the card's terms.
Your statement and cardholder agreement are the final word. See our methodology for how every calculator on this site works.
Comparing It to a Personal Loan
If you can't realistically clear the balance during the promo, a fixed-rate loan may cost less. Compare both with the Debt Consolidation vs. Balance Transfer Calculator, or plan a promo payoff with the 0% Intro APR Calculator. If the offer is a store card's "no interest if paid in full" deal rather than a true 0% APR, use the Deferred Interest Calculator instead, because missing the deadline brings back all the interest from day one.
Frequently Asked Questions
Is a balance transfer worth the transfer fee?
It can be when the interest you'd save is larger than the fee. Transfer fees are often 3-5% of the amount moved. This calculator compares your estimated total cost of staying put with the cost of transferring, fee included, at the same monthly payment.
What happens if I don't pay off the balance before the promo APR ends?
Any remaining balance starts accruing interest at the card's standard APR. On deferred-interest offers, interest may be charged back to the start of the promotion. To avoid a leftover balance, divide the transferred amount (including the fee) by the number of promo months and pay at least that much.
Can I transfer a balance between cards from the same bank?
Generally no — many issuers won't let you transfer a balance to another card issued by the same bank. You'll usually need an offer from a different issuer.
Is the transfer fee added to my balance?
Usually, yes. The fee is typically added to the new card's balance at the time of the transfer, which is how this calculator treats it.
Can a late payment cancel my promotional rate?
On some cards, yes. Under federal rules (Regulation Z § 1026.55), an issuer can generally raise the rate on an existing promotional balance before the promo ends only if your minimum payment is more than 60 days late. A shorter late payment can still bring a late fee and a higher rate on new purchases after notice, so check your card's terms. Check the offer details before you transfer.
Do new purchases on the transfer card get 0% too?
Not necessarily. Purchases may carry the regular purchase APR and, on some cards, may not get a grace period while a transferred balance remains. Many people avoid using the transfer card for new purchases during the promo.
Does a balance transfer hurt my credit score?
Applying for a new card usually triggers a hard inquiry, and a new account lowers your average account age. On the other hand, a new credit limit can lower your overall utilization. The net effect depends on your credit profile.
This calculator provides estimates for educational purposes only and is not financial, tax, or legal advice. Most results use a simplified monthly-interest model (APR ÷ 12); your card issuer may use a daily periodic rate and average daily balance, plus its own fees and grace period rules, so your actual figures may differ — always confirm against your official statement.
Sources
- What is a balance transfer fee? — Consumer Financial Protection Bureau. Checked September 25, 2026.
- I got a credit card promising no interest for a purchase if I pay in full within 12 months. How does this work? — Consumer Financial Protection Bureau. Checked September 25, 2026.
- Regulation Z § 1026.55 – limits on raising APRs, including the 60-days-late rule — Consumer Financial Protection Bureau. Checked September 25, 2026.