Balance Transfer Calculator

The balance transfer calculator compares two paths for existing credit card debt. Path one keeps the balance on the old card at the old APR. Path two moves the balance to a new card, adds a transfer fee, applies a promotional APR for a set number of months, and then applies the regular APR after the promotion. The calculator uses the same monthly payment in both paths so the result focuses on financing cost rather than on changing your repayment effort.

This page is intentionally different from the credit card payoff calculator, which asks how long one fixed-payment plan takes to clear a card, and from the credit card interest calculator, which estimates one billing cycle’s interest. A transfer offer is a comparison problem: the headline 0% APR matters, but the fee, length of the promotional period, regular APR, and your payment size decide whether the transfer actually saves money.

Inputs that matter most

Enter the amount to transfer, which is the old balance you are considering moving. Enter the monthly payment you plan to make after the transfer. Use a payment you can sustain; a plan that only works with an unrealistic payment is risky. Enter the old card APR for the card you would otherwise keep paying. Then enter the transfer offer: transfer fee, promotional APR, promotional period, and regular APR after promo. Finally, choose how many months to compare.

The calculation rounds the comparison period to a whole number of months. It does not round the promotional period before comparing each month, so a non-integer promotional period can behave oddly around the cutoff. In ordinary use, enter whole months such as 12, 15, 18, or 21.

Formula

The transfer fee is:

$\text{transfer fee amount} = \text{amount transferred} \times \frac{\text{transfer fee percentage}}{100}$

The old card starts with the original balance. The new card starts with the transferred amount plus the fee:

$\text{new card starting balance} = \text{amount transferred} + \text{transfer fee amount}$

Each month, the calculator applies the relevant monthly rate:

$\text{monthly rate} = \frac{\text{APR}}{100 \times 12}$

Then it updates the balance:

$\text{ending balance} = \text{starting balance} + \text{starting balance} \times \text{monthly rate} - \text{payment}$

The old-card cost is old-card interest. The new-card cost is the transfer fee plus new-card interest:

$\text{savings} = \text{old card interest} - (\text{transfer fee amount} + \text{new card interest})$

Example

Use the defaults: $7,000 transfer amount, $500 monthly payment, 21.99% old card APR, 3% transfer fee, 0% promotional APR for 18 months, 19.99% regular APR, and an 18-month comparison.

The transfer fee is:

$\$7{,}000 \times \frac{3}{100} = \$210$

The new-card starting balance is $7,210. Because the promotional APR is 0% and the debt is paid within the 18-month promotion, new-card interest is $0. The transfer path therefore costs exactly $210 in the calculator. The old-card path accrues monthly interest at 21.99% APR while the same $500 payment is applied. The displayed result is:

The transfer saves money here because the $210 fee is much smaller than the old card interest avoided. The payoff on the new card is 15 months because $500 monthly payments clear $7,210 before the promotional period ends.

Why 0% APR is not the whole decision

A 0% promotional APR can be valuable, but it is not free if the card charges a fee. A 3% fee on $7,000 is $210 immediately. A 5% fee would be $350. The larger the fee and the shorter the comparison period, the more interest the old card must avoid before the transfer breaks even. The regular APR also matters if the balance survives the promotional period. A high post-promo APR can erase savings if the monthly payment is too small.

Balance transfers can also affect credit utilization. Moving debt to a new card may lower utilization on the old card but raise utilization on the new card, especially if the new limit is close to the transferred amount. Use the credit utilization calculator to estimate the reported balance-to-limit ratio after the transfer.

Practical balance-transfer tips

• Compare the fee against the interest you expect to avoid.
• Divide the new-card starting balance by promotional months to estimate the payment needed to finish before regular APR begins.
• Avoid new purchases on the transfer card unless you understand how payments are allocated.
• Set automatic payments to reduce the risk of losing promotional terms.
• Use the budget calculator to test whether the planned monthly payment is realistic.
• Re-run the comparison if the approved credit limit is lower than expected.

Informational note

This calculator is educational and does not evaluate credit approval, issuer eligibility rules, payment allocation requirements, late-payment consequences, or all possible fees. Read the balance transfer offer and card agreement before acting.

Sources

• CFPB, Credit cards — consumer tools for comparing and managing cards.
• CFPB, Credit cards key terms — definitions for balance transfer, APR, fees, and related terms.
• CFPB, How do I calculate my credit card interest? — interest-rate context for comparing old and new card costs.