FX Conversion Cost Calculator
Most brokers bury their FX markup inside the exchange rate. This tool makes it visible — as an annual drag, as a total cost, and as what you could save with a tighter spread.
The amount in your base currency converted each time (e.g. your monthly investment).
Check your broker's fee schedule or measure against mid-market rate at xe.com.
For comparison — e.g. IBKR charges ~0.20%, Wise ~0.45%, Revolut varies.
Cost per conversion
£15.00
vs £4.50 alternative
Annual FX drag
£180
vs £54 alternative
Total FX cost over 10 years at your broker's spread
£1,800
You could save £1,260 by switching to the alternative spread — 1.50% of total invested lost to FX at current broker
Total invested
£120,000
Over period
FX cost (broker)
£1,800
1.50% of invested
Potential saving
£1,260
vs alternative
Cumulative FX cost over time
| Yr | Total invested | FX cost (broker) | FX cost (alt) | Saving |
|---|---|---|---|---|
| 1 | £12,000 | £180 | £54 | £126 |
| 2 | £24,000 | £360 | £108 | £252 |
| 3 | £36,000 | £540 | £162 | £378 |
| 5 | £60,000 | £900 | £270 | £630 |
| 7 | £84,000 | £1,260 | £378 | £882 |
| 10 | £120,000 | £1,800 | £540 | £1,260 |
Illustrative only. Assumes constant conversion amount and frequency over the period. Does not account for portfolio growth, varying FX rates, or broker minimum fee structures. FX spread is applied at conversion time only.