Balance Transfer Calculator
This balance transfer calculator simulates both paths — staying on your current card versus moving the balance to a 0% promo card — and reports the net savings after the transfer fee and the post-promo APR, not just the interest you skip.
Free tool · No sign-up · Using it has no impact on your credit score
The purchase APR on the card you'd transfer away from.
Assumed the same on both paths, so the comparison is fair.
Typically 3–5% of the transferred amount.
Net savings from transferring
$1,325
Transferring saves $1,325 after the fee, but the balance outlives the promo — the post-promo APR eats into savings. Raising the payment enough to finish inside the window widens the gap.
Transfer fee
$180
Charged up front and added to the transferred balance — the fixed price of admission the savings must beat.
Time to debt-free after transferring
1 year 10 months
That's past the 15-month promo, so the tail of the balance pays the post-promo rate.
Balance: stay vs transfer
- Stay on current card
- After transfer
What this calculator tells you
This calculator answers the only question that matters about a balance transfer: after the fee and after whatever balance survives the promo starts accruing at the new card's regular rate, do you actually come out ahead — and by how much? Card marketing shows you the 0% window; this shows you the whole journey, on both cards, month by month.
The net savings figure is a genuine two-path comparison: the interest you'd pay staying put, minus the transfer fee plus any post-promo interest on the new card, with the same monthly payment on both sides. It can be negative — small balances and short promos sometimes don't justify the fee — and the calculator says so plainly rather than assuming a transfer always wins.
How it works
Two simulations run in parallel. The "stay" path pays down your balance at the current APR, month by month. The "transfer" path adds the fee to the balance up front, charges zero interest during the promo months, then applies the post-promo APR to whatever remains. Net savings is the stay path's total interest minus the transfer path's total cost (fee plus post-promo interest).
The chart overlays both balance curves so you can see the mechanism: during the promo, the transfer line falls faster because every dollar hits principal; if the balance survives the window, the two lines' slopes converge again.
Formula and assumptions
Each month on the stay path: interest = balance × (current APR ÷ 12), balance falls by payment minus interest. On the transfer path the starting balance is balance × (1 + fee%), interest is zero for the promo months and balance × (post-promo APR ÷ 12) thereafter. Net savings = stay-path interest − (fee + transfer-path interest); it's reported as null when either path never reaches zero, because "savings" between two endless debts is meaningless.
Key assumptions: you pay the same fixed amount every month on either card, you make no new purchases on the transfer card (new purchases usually accrue interest immediately and get paid last), and you never miss a payment — most issuers cancel the promo rate on a missed payment. The fee is assumed to be capitalized into the balance, which is how issuers actually apply it.
Example scenario
Transferring a $6,000 balance from a 22.9% card, paying $300 a month, with a 3% fee and a 15-month 0% promo at 24.9% afterward, compares like this:
- Net savings from transferring
- $1,325
- Transfer fee
- $180
- Time to debt-free after transferring
- 1 year 10 months
Is my result good or bad?
The strongest result is net savings in the hundreds or thousands with the balance cleared inside the promo window — that's the transfer working exactly as designed, converting every payment into principal. As a rule of thumb, if your monthly payment × promo months covers the balance plus the fee, you're in that ideal zone. Savings that survive a post-promo tail are still real, but they shrink fast if the tail is long: a 24.9% post-promo rate is usually worse than the card you left.
A negative result isn't a calculator error — it's the fee outweighing the interest avoided, which genuinely happens when the balance is small, the payment is aggressive, or the promo is short. In the "small balance, short promo" preset, staying put and simply paying hard is competitive. And if the calculator warns that the balance never clears, the problem isn't which card holds the debt; it's that the payment doesn't outrun the interest. Fix the payment first, or consider a fixed-rate consolidation loan with a defined end date.
Frequently asked questions
How much can a balance transfer save me?
It scales with your balance, your current APR, and how much of the debt you clear inside the 0% window. In the example above — $6,000 at 22.9% with $300 monthly payments — the transfer saves roughly $1,300 even though a slice of the balance outlives the 15-month promo. Bigger balances at higher rates save more; small balances can save nothing after the fee.
Is the balance transfer fee worth paying?
Compare the fee to the interest you'd otherwise pay — that's the break-even. A 3% fee on $6,000 is $180, while staying at 22.9% and paying $300 a month costs around $1,600 in interest, so the fee wins easily. The fee loses when the balance is small or you'd pay it off within a few months anyway: months of avoided interest must exceed the fee, and at high APRs that takes roughly two to three months of carrying the balance.
What happens if I don't pay off the balance during the 0% period?
The remaining balance starts accruing at the card's regular APR — often 22–28%, frequently higher than the card you left. There's no retroactive interest on a standard balance transfer card (unlike "deferred interest" store-card promotions, which back-charge the whole period). The practical move: divide your balance plus fee by the promo months and try to pay at least that amount, so the window does all the work.
Do balance transfers hurt my credit score?
Briefly and mildly, then usually the opposite. The application adds a hard inquiry (a few points, fading within a year) and a new account lowers your average account age. But the new card's credit line lowers your overall utilization ratio — a heavyweight scoring factor — and paying the balance down at 0% lowers it further. Most people's scores recover and improve within a few months, provided they don't run the old card back up.
Can I transfer a balance between cards from the same bank?
Almost never — issuers universally prohibit transferring balances between their own cards, since the 0% offer exists to poach other banks' debt, not to discount their own. Check who actually issues both cards, not the network logo: two Visa cards from different banks transfer fine, while a Chase-to-Chase transfer will be declined. If your best offer is from your current issuer, ask them for an APR reduction or hardship rate instead.
Should I make new purchases on a balance transfer card?
No. Carrying a transferred balance typically forfeits the grace period on new purchases, so spending accrues interest at the regular APR from day one — and payments above the minimum are applied to the 0% balance in ways that can leave the high-rate purchases sitting there. Treat the transfer card as a payoff vehicle only, and run daily spending through a different card or debit.
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Estimates only. Results assume the inputs you provide and standard fixed-rate math. Actual lender offers, rates, and terms are determined by lending partners based on your credit profile and state. BankMinistry is not a lender. Not financial advice.