Balance Transfer Cost Calculator

A balance transfer is a trade: you pay a one-time fee, usually 3 to 5%, to move debt onto a lower or 0% promotional APR. This calculator prices both sides of that trade. It shows the fee, the monthly payment that clears the balance inside the promo window, the interest you would pay by staying put, what is left when the promo ends if you pay at your own pace, and a plain verdict on whether the transfer saves you money.

Quick Answer

How to use this balance transfer cost calculator

Pick a mode, enter the offer exactly as the card states it, and read the verdict against the fee line. The results stay hidden until you click Calculate.

1. Auto payoff plan (the default): enter balance, current APR, fee, promo APR, promo months and post-promo APR. The calculator sizes the payment that clears the transfer inside the promo and prices staying put at that same payment.
2. My monthly payment: switch the mode and two extra fields appear. Enter the payment you would actually make on the old card and on the new card. The calculator amortizes both, keeps charging the post-promo APR on any balance left at expiry, and reports the break-even month and the balance left when the promo ends.
3. Read the saving line, not the fee line: a $150 fee looks expensive until it sits next to $1,213.80 of avoided interest. The verdict box states the net result in one sentence.
4. Save each offer: after a calculation, Save scenario stores it in your browser. Run a second offer, save that too, and the saved scenarios table compares payment, fee, old-card interest, transfer cost and net saving side by side.
5. Mind the two mode notes: the post-promo APR only affects My monthly payment mode, because Auto mode clears the balance inside the promo by construction. A blank promo APR is treated as 0%.

The fee vs interest formula

Transfer fee = balance × fee percentage. New balance = balance + fee. The saving is the interest the old card would have charged, minus everything the transfer charges: the fee plus any promo and post-promo interest.

The old-card interest is not a flat APR × balance estimate. The calculator simulates the old balance month by month at the same monthly payment: interest accrues on what is left, the rest of the payment cuts principal, and the interest total is the sum of those monthly charges until the balance clears. That simulation is why the numbers here match a statement, not a shortcut. The break-even month in My monthly payment mode is the first month when cumulative interest saved against the old card reaches the fee. Consumer rules behind these offers, including how promotional APRs and fees must be disclosed, sit in Regulation Z, which the Consumer Financial Protection Bureau publishes in full, and the Bureau’s credit cards key terms page defines a balance transfer and its promotional rate in plain language.

Worked example: the auto payoff plan, checked against this tool

The pre-filled offer is $5,000 at 24% APR, a 3% fee, 0% for 18 months. Run it and the tool returns the fee, the payoff payment and the staying-put cost below, to the cent.

Three more runs show where the verdict flips. Every row is a real run of this calculator in Auto mode.

The last row is the sanity check most calculators never show. If the old card charges no interest, a transfer fee buys nothing, and the tool says so in plain words: not worth it, a net loss of $150.00. A transfer only wins when real interest is being avoided, which is also why small balances clearable in a couple of months produce thin savings even at high APRs.

Beat the promo deadline: the payment that finishes in time

The required payment is the new balance divided by the promo months: $5,150 ÷ 18 = $286.11 on the worked example. Pay that from the first statement, by autopay, and the balance reaches zero in the same month the promo ends.

Miss it and the arithmetic turns. Whatever is left at expiry starts accruing the post-promo APR, often 24% or more, while the fee is already spent. My monthly payment mode exists to price that risk before you commit: it keeps amortizing the leftover at the post-promo rate and prints the balance left when the promo ends, so you see the exposure in dollars. Run the worked manual example: $5,000 at 22% APR, 3% fee ($150), 0% for 12 months then 15%, paying $200 a month on both cards. The old card takes 34 months and $1,749.88 of interest. The transfer still leaves $2,750.00 standing when the promo ends, and its total cost is $436.46 once post-promo interest is counted, for a net saving of $1,313.42 and a break-even point in month 2. The transfer wins clearly, but the $2,750 leftover is the number to plan around, not the headline saving.

Two practical points follow. First, the promo clock on most cards starts at account opening, not when your transfer posts, so a slow transfer quietly eats the first weeks of the window. Second, rounding matters at the margin: pay exactly $286.11 in manual mode on the 18-month example and a $0.02 residue survives the promo end date, because the true payment is $286.111… Paying $287, or one extra dollar a month, removes the tail entirely. If your only question is the deadline itself, how much time a 0% window really gives you and whether a given payment clears it, the 0% APR time calculator is built for that timing question alone. This page owns the cost side: fee against interest, and the price of finishing late. While you compare, the credit card minimum calculator shows what the old card does to the same balance at minimum payments, and the multiple credit card payoff calculator orders several balances when one transfer cannot cover them all.

When a balance transfer loses money

A transfer loses when the fee and the leftover cost more than the interest avoided. The patterns below are the ones that flip the verdict in this calculator, and they matter more while revolving rates stay near the levels in the Federal Reserve’s G.19 consumer credit release.

One more rule of thumb from the math: the faster you could pay the old card anyway, the less a transfer can save you, because there is less interest left to avoid. On the worked example, paying $1,500 a month on both cards leaves only $229.75 of old-card interest to avoid, so the saving shrinks to $79.75. High payments shrink the prize; low payments stretch it but raise the deadline risk. The calculator’s two modes let you test both ends of that trade with your own numbers. When no transfer offer wins, the alternative is a single loan at a lower rate: the credit card debt consolidation calculator prices that comparison on the same balances. This calculator estimates transfer costs for planning only. Actual finance charges depend on your card’s terms, payment timing and fees, and it is not financial advice.

What this calculator covers, and why each part matters

This calculator prices a balance transfer two ways, and in both the payment is held constant on the two sides, so the saving shown is what the transfer itself buys.

• Auto mode sizes the payoff payment for you. Enter the offer and the calculator works out the payment that clears the transfer inside the promo, then prices staying put at that same payment.
• Manual mode amortizes your real payments. Enter the payment you would actually make, and the calculator amortizes both cards through the promo and past it at the post-promo APR, month by month on the shrinking balance, and reports the break-even month and the balance left when the promo ends.
• A plain-language verdict, with the fee beside the interest it must beat. The fee is never shown on its own: every result pairs it with the old-card interest avoided, and the verdict states the net result in one sentence.
• A saved-scenario table for comparing offers. Save each offer after calculating, and the table compares payment, fee, old-card interest, transfer cost, and net saving side by side.

Frequently asked questions

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