Balance Transfer Calculator
A balance transfer moves your credit card debt to a new card with a 0% promotional APR, letting you pay down principal without interest — but you pay a transfer fee (typically 3%–5%) upfront. This calculator shows whether the interest savings outweigh that fee.
Enter your current card details and the balance transfer offer to see your exact interest savings, transfer fee cost, net benefit, and the monthly payment needed to clear the balance before the promo period ends.
How Balance Transfers Work — and When They Save Money
A balance transfer is one of the most powerful debt payoff tools available — when used correctly. The idea is simple: you move existing high-interest credit card debt to a new card offering 0% APR for a promotional period, typically 12–21 months. During that window, every dollar you pay reduces principal, not interest. For someone carrying $6,000 at 22% APR, that can mean $1,000+ in interest savings over 15 months.
The catch is the transfer fee — typically 3%–5% of the transferred balance, charged upfront. On a $6,000 transfer at 3%, that's $180 out of pocket on day one. Whether the transfer makes sense depends entirely on whether the interest you avoid exceeds that fee. This calculator does that comparison precisely, using your actual balance, rate, and payment amount.
The Break-Even Math
Interest saved is calculated by running your current payment against your current balance at your current APR for the length of the promo period. That's how much interest you'd pay keeping the card. The transfer fee is simply balance × fee percentage. If interest saved > fee, you come out ahead. If not, the transfer costs money. It's that clean — and surprisingly, many people do transfers that don't save them a single dollar because the fee exceeds their interest cost over the promo window (often because their balance is small or their rate is low).
| Scenario | APR | Fee | Interest Saved | Net Benefit |
|---|---|---|---|---|
| Keep card, $200/mo | 22% | — | — | Baseline |
| Transfer, 15-mo promo, 3% fee | 0% | $180 | $1,094 | +$914 ✓ |
| Transfer, 12-mo promo, 5% fee | 0% | $300 | $826 | +$526 ✓ |
| Transfer, 6-mo promo, 5% fee | 0% | $300 | $396 | +$96 ✓ |
The Required Monthly Payment — Why It Matters Most
The biggest mistake with balance transfers is not paying off the balance before the promo period ends. When the 0% period expires, the remaining balance starts accruing interest at the card's standard APR — often 20%–29%. Some cards also retroactively charge interest on the original balance if you missed even one payment. This calculator shows the exact monthly payment needed to eliminate the entire balance within the promo window, so you can plan accordingly before committing to the transfer.
What to Watch Out For
Not all balance transfer offers are equal. The transfer fee varies from 0% (rare promotional offers) to 5% on most major cards. The promo period ranges from 12 to 21 months. Some cards charge a high post-promo APR — if your budget doesn't support full payoff, a card with a lower post-promo APR is safer. Also confirm the new card's credit limit is high enough for your full transfer amount; partial transfers are allowed but complicate planning.
If you have multiple cards and are thinking about consolidating all of them (not just transferring to a 0% card), the Debt Consolidation Calculator compares a personal loan against all your current debts. For a broader strategy on eliminating credit card debt, read our guide on how to get out of credit card debt.
Frequently Asked Questions
What is a balance transfer?
A balance transfer moves existing credit card debt to a new card, usually one offering 0% promotional APR for 12–21 months. The goal is to pause interest accumulation and pay down principal faster. Most cards charge a transfer fee of 3%–5% of the balance, which is added to the new card's balance or charged separately. The transfer makes sense when interest savings exceed the fee.
How do I know if a balance transfer saves money?
Subtract the transfer fee from the interest you would have paid on your current card during the promo period. If the savings exceed the fee, the transfer is worthwhile. This calculator does that math automatically. As a rough rule of thumb: if your APR is above 15% and the promo period is at least 12 months, most balance transfers with a 3% fee save money on balances over $1,000.
What happens if I don't pay off the full balance before the promo period ends?
The remaining balance starts accruing interest at the card's standard APR — typically 20%–29% — from the day the promo ends. Some cards retroactively charge interest on the original transferred amount if you missed a payment during the promo. Always plan your monthly payment to eliminate the balance before the deadline. This calculator shows the exact monthly amount needed.
Does a balance transfer hurt your credit score?
Applying for a new card causes a hard inquiry, temporarily reducing your score by 5–10 points. However, if the transfer significantly lowers the utilization on your old card, your score often improves within 3–6 months. The net effect is usually neutral to positive for borrowers who manage the new card responsibly and don't run up new debt on the old card.
Can I transfer balances from multiple cards?
Yes — most balance transfer cards allow you to consolidate multiple balances, up to your credit limit. Each transfer typically incurs the same transfer fee percentage. If consolidating several cards, calculate the total fee (sum of all balances × fee %) against your total interest savings across all transferred cards to confirm the combined transfer still makes sense.
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