Balance Transfer Calculator
Estimate a balance transfer fee and the interest saving during a promotional period.
Transfer fee
£90.00
- Indicative interest avoided
- £1,120.50
- Indicative saving after fee
- £1,030.50
Simple estimate assuming the balance stays unchanged and the promotional rate is 0%. Fees and repayments may alter the result.
v1.0 · Reviewed September 2026
How this is worked out
The fee is the balance × the fee percentage. The interest avoided is the balance × APR × months ÷ 12, and the saving is that interest less the fee.
Worked example
- Balance £3,000
- Fee 3%
- 18 months
- APR 24.9%
fee £90, interest avoided £1,120.50
£90.00 fee against £1,030.50 of indicative saving
Assumptions and limits
- Assumes the promotional rate is 0% and the balance stays the same for the whole period. In reality you would be repaying it, so the real interest avoided is lower than shown.
- Assumes you clear or move the balance before the promotional period ends, after which the standard rate applies.
- Ignores new spending on the card, which is usually charged at the standard rate.