Balance Transfer Savings Calculator
Compare your current credit card payoff path with a balance transfer offer. See whether the promo APR saves enough interest to outweigh the transfer fee, and what happens after the promo period ends.
Your numbers
1) Current card
2) Balance transfer offer
How this calculator works
This calculator compares two payoff paths: keeping the current credit card and moving the balance to a balance transfer offer. The current-card path applies monthly interest using your current APR, then subtracts your current monthly payment until the balance reaches zero.
The transfer path accounts for the transfer fee, applies the promo APR during the promotional period, then switches to the post-promo APR if a balance remains. The result compares total cost, payoff time, balance after promo, and the month when the interest saved first offsets the transfer fee.
Results
What the transfer changes
Compare the paths
Keep the current card
This keeps the existing balance, APR, and monthly payment.
Use the transfer offer
This applies the transfer fee, promo APR, post-promo APR, and transfer payment.
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- Interest accrues monthly using APR ÷ 12.
- The current-card path uses the current APR and current monthly payment until payoff.
- The balance-transfer path uses the promo APR for the promo period, then the post-promo APR after that.
- The transfer fee is either added to the new balance or treated as paid upfront, depending on the checkbox.
- Break-even month is the first month when interest saved compared with the current card offsets the transfer fee.
- No new purchases, late fees, annual fees, penalty APR changes, rewards, issuer-specific daily balance methods, or missed payments are included.
What this result means
A balance transfer isn't automatically better just because the promo APR is lower. The real comparison is whether the interest saved during the promo period is enough to overcome the transfer fee and any balance left after the promo ends.
The strongest transfer results usually have three things working together: a fee that's small enough to recover, a promo period long enough to reduce the balance, and a payment large enough to avoid carrying too much debt into the post-promo APR.
When a balance transfer is doing real work
A transfer helps most when it changes more than the interest rate on paper. It should reduce the amount of interest paid, keep the payoff path moving, and avoid leaving too much balance exposed to the regular APR later.
- The break-even month happens early: the interest saved offsets the transfer fee while there's still time left in the promo period.
- The balance after promo is low: less debt remains exposed to the post-promo APR.
- The total cost comes down after the fee: the offer is improving the result, not just moving the balance to a different card.
- The payment is realistic: the transfer works better when the monthly payment is something you can actually keep making.
When those things line up, the transfer is doing more than buying time. It's giving more of each payment a chance to reduce the balance.
When the transfer fee can weaken the result
The transfer fee matters because it creates a cost before the promo rate has saved anything. A 0% APR period can still be useful, but the fee has to be earned back through lower interest.
When the fee is recovered quickly
If the break-even month comes early, the promo period has enough time to create savings after the fee is covered.
When the fee takes too long
If break-even happens near the end of the promo period or not at all, the offer may not be changing the result much.
When the fee is rolled in
If the fee is added to the new balance, it becomes part of what you have to repay and can collect interest after the promo period.
Why the balance after promo matters
The promo period is temporary. If a meaningful balance remains when the regular APR starts, the transfer can lose part of its advantage. That doesn't always make the transfer a bad move, but it changes what the offer is really doing.
- A low remaining balance is easier to manage: the regular APR has less time and less principal to work against.
- A high remaining balance raises the risk: the transfer may become expensive once the promo period ends.
- The payment size matters more than the offer headline: a long 0% period helps less if the monthly payment leaves too much balance behind.
The best transfer offer isn't just the one with the lowest promo APR. It's the one that gives your payment enough time to reduce the balance before the regular APR starts.
When staying with the current card may be better
Sometimes the current card path still comes out ahead. That can happen when the transfer fee is too high, the payment is too low, or the balance after the promo period is large enough that the regular APR takes away much of the benefit.
- The break-even month isn't reached: the interest saved doesn't recover the fee within the modeled payoff path.
- The transfer costs more overall: the promo period helps, but not enough to beat the fee and post-promo interest.
- The payoff timeline gets longer: a lower-interest window may still produce a weaker result if the payment is too small.
- The result is close either way: if the difference is small, payment behavior may matter more than the offer itself.
What to test next
Test a higher payment
If too much balance remains after the promo period, try a larger monthly payment and see whether the transfer becomes stronger.
Test a target payoff date
If you want the balance gone before the promo period ends, work backward from that date to find the payment required.
Compare against consolidation
If the transfer leaves too much risk after the promo period, a fixed-rate consolidation option may be worth comparing.
When this calculator is most useful
- When you are comparing a 0% APR offer: it shows whether the promo period is long enough to overcome the transfer fee.
- When the fee looks small: it turns the percentage fee into a dollar amount and compares it with interest saved.
- When you may still have a balance after the promo: it shows how much debt could remain when the regular APR starts.
- When you want a cleaner comparison: it puts the current card path and transfer path next to each other.
Mistakes this calculator can help you catch
- Assuming 0% APR means the transfer is automatically cheaper
- Ignoring the transfer fee because it looks small as a percentage
- Using the same monthly payment without checking the balance left after the promo period
- Forgetting that the regular APR can matter if the balance isn't paid off in time
- Comparing APRs without comparing total cost, payoff time, and break-even month
Explore more calculators
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These guides explain how interest, payment size, and payoff timing shape whether a repayment move actually improves the outcome.