How to use this calculator
- Enter balance to transfer, existing nominal annual rate (%), transfer fee (%), promotional nominal rate (%), promotional months, nominal rate after promotion (%), fixed monthly payment.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
No purchases, fees other than the entered transfer fee, or penalty-rate triggers. Payment must amortize each applicable balance within the 1,200-month horizon.
Worked example
A 1,000 balance already at 0% gains no interest saving from another 0% offer; adding a 3% transfer fee increases total cash cost by 30.
What the result means
Compare total cash cost and payoff time, including the transfer fee and expiry of the promotional period.
Common questions
How is the calculation performed?
Add the transfer fee to the new balance; apply promotional then post-promotion monthly interest while simulating fixed payments. Compare with keeping the old balance and rate.
What does the model leave out?
No purchases, fees other than the entered transfer fee, or penalty-rate triggers. Payment must amortize each applicable balance within the 1,200-month horizon.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.