Balance Transfer Calculator

Compare a credit card balance transfer to keeping your current card. Estimate interest savings, transfer fees, payoff months, and post-promo APR risk.

819.0K uses Updated · 2026-05-14 Runs locally · zero upload
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How to Use Balance Transfer Calculator

The Balance Transfer Calculator decides whether a 0% offer actually beats your current card.

  1. Enter the balance — The amount you plan to transfer.
  2. Enter the fee rate — Usually 3% or 5%; some cards offer 0%.
  3. Enter the 0% promo months — Typically 12 to 21 months.
  4. Enter the post-promo APR — The rate after the promotional period ends.
  5. Enter your planned monthly payment — How much you can realistically commit per month.
  6. Enter the current card APR — For the “do nothing” comparison.
  7. Read the result — The Balance Transfer Calculator shows interest savings, fee paid, payoff time, and remaining balance when the promo expires.

Formula & Theory - Balance Transfer Calculator

The Balance Transfer Calculator simulates two payoff paths:

TransferFee = Balance × FeeRate

Transfer path:
  Month 1..PromoMonths: interest = 0
  After promo: monthly interest = remaining × (PostAPR/12)
  Pay = MonthlyPayment until balance = 0

Keep-card path:
  Every month: interest = remaining × (CurrentAPR/12)
  Pay = MonthlyPayment until balance = 0

NetSavings = KeepCardInterest − (TransferFee + TransferInterest)

A balance transfer can be powerful when you have a clear payoff plan: a balance that fits within the promo period at your planned monthly payment will accrue zero interest, and you only lose the transfer fee. If you cannot pay off the full balance before the promo ends, your savings depend on the post-promo APR vs. the current card APR.

Watch out for:

  • Foregone grace period on the destination card (new purchases may accrue interest immediately).
  • Minimum payments that don’t fully amortize the balance within the promo.
  • High post-promo APR that wipes out savings if you carry beyond month 21.
  • Transfer fees compounded over multiple transfers.

Use Cases for Balance Transfer Calculator

  • High-APR card payoff strategy — Compare a 24% APR card to a 0% transfer offer.
  • Debt consolidation — Combine multiple cards onto one balance transfer.
  • Comparison shopping — Test 12 vs 18 vs 21-month promos to see which works for your monthly payment.
  • Avoiding a debt trap — Confirm the transfer fee is actually justified by the savings.
  • Refinance alternative — Compare against a personal loan refinance.
  • Cash-flow planning — Determine the minimum monthly payment needed to clear the balance inside the promo.

The Balance Transfer Calculator is a fast reality check on credit card balance transfer offers.

Frequently asked questions about Balance Transfer Calculator

Is a balance transfer always worth it?

Not always. If the transfer fee plus post-promo interest exceeds the interest you would have paid on the old card, the transfer loses money. The Balance Transfer Calculator computes the actual break-even.

What is a typical balance transfer fee?

Most US issuers charge 3% or 5% of the transferred amount, with some no-fee offers from credit unions. The Balance Transfer Calculator includes the fee in the comparison.

What happens after the 0% promo ends?

Any remaining balance accrues interest at the post-promo APR. The Balance Transfer Calculator simulates that interest until full payoff.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.