Compare costs of keeping your current card vs transferring to a promotional offer
Current Card Details
New Balance Transfer Card Details
Payment Details
How to Use This Tool
Start by entering your current credit card’s outstanding balance and annual percentage rate (APR). Next, add details for the balance transfer card you are considering: promotional APR, length of the promotional period, regular APR after the promo ends, and balance transfer fee percentage. Input the monthly payment amount you plan to make consistently, then click Calculate Savings to see the full breakdown. Use the Reset Form button to clear all fields and start a new comparison.
All fields are required and will display error messages if invalid values are entered. Ensure your monthly payment is high enough to cover at least the interest accrued on your current card to get accurate results.
Formula and Logic
This calculator uses standard loan amortization math with monthly compounding, which aligns with how most credit card issuers calculate interest. Below is the core logic used for calculations:
- Monthly interest rate = Annual APR / 1200 (converts percentage to monthly decimal)
- Payoff time (months) = log(Monthly Payment / (Monthly Payment - Balance * Monthly Rate)) / log(1 + Monthly Rate)
- Total interest paid = (Monthly Payment * Payoff Time) - Initial Balance
- Balance transfer fee = Current Balance * (Transfer Fee Percentage / 100), added to the new card’s initial balance
- New card balance after promo period = (New Initial Balance * (1 + Promo Monthly Rate)^Promo Months) - (Monthly Payment * ((1 + Promo Monthly Rate)^Promo Months - 1) / Promo Monthly Rate)
- Total savings = Total cost of current card (balance + interest) - Total cost of transfer card (new balance + interest)
Results round payoff time up to the nearest full month, as partial months are not counted for billing purposes.
Practical Notes
Balance transfer offers often come with strict eligibility requirements, including good to excellent credit scores (typically 670 or higher). Promotional APRs usually only apply to transferred balances, not new purchases made on the card. Missing a single payment during the promotional period may void your promotional rate and trigger a penalty APR, often 29.99% or higher.
Balance transfer fees typically range from 3% to 5% of the transferred amount, with a minimum fee of $5 to $10. Always confirm the fee structure before applying, as high fees can erase savings for small balances. Making higher monthly payments than the minimum will increase your total savings and shorten payoff time for both options.
Credit card interest compounds daily for most issuers, but this calculator uses monthly compounding for simplicity. The actual interest paid may vary slightly based on your issuer’s specific compounding schedule.
Why This Tool Is Useful
Balance transfer offers can save hundreds or thousands of dollars in interest, but they are only beneficial if the math works in your favor. This tool eliminates guesswork by comparing your current card’s total cost to the transfer option, including often-overlooked fees. It helps you avoid transfers that cost more than keeping your current card, and identifies how much you can save by adjusting your monthly payment.
Financial planners recommend comparing at least 3 balance transfer offers before applying, as promotional terms vary widely between issuers. This calculator lets you run multiple scenarios quickly to find the best option for your budget.
Frequently Asked Questions
Does the balance transfer fee make the transfer not worth it?
Not always. For example, a 3% fee on a $5,000 balance is $150. If your current card charges 23% APR and you transfer to a 0% promo for 12 months, you would save roughly $575 in interest over that year, even after paying the $150 fee. Use this calculator to confirm the fee is lower than your projected interest savings.
What happens if I miss a payment during the promotional period?
Most credit card issuers will immediately end your promotional APR and apply a penalty APR to your remaining balance if you miss a payment. Some issuers also charge a late fee of up to $40. Always set up autopay for at least the minimum payment to avoid losing your promotional rate.
Can I transfer balances from multiple credit cards?
Yes, most balance transfer cards allow you to transfer balances from multiple existing cards, up to your new card’s credit limit. Keep in mind that the balance transfer fee applies to the total amount transferred, so factor that into your calculations if you plan to consolidate multiple balances.
Additional Guidance
Only transfer a balance if you are confident you can pay it off before the promotional period ends. If you have a remaining balance when the promo ends, you will start accruing interest at the regular APR, which may be higher than your original card’s rate. Create a budget that allocates the monthly payment amount you entered to your credit card debt until the balance is fully paid off.
Avoid using your new balance transfer card for purchases, as payments often go toward the lowest-interest balance first, meaning your purchases will accrue interest at the regular APR until the transferred balance is paid off. If you need to make new purchases, use a separate card with a rewards program or low APR.