Work out currency conversion markup instantly with clear inputs, formula shown and shareable results.
The mid-market rate is the true midpoint between buy and sell; anything away from it is the provider's margin. Expressing that gap as a percentage of the mid rate gives the real cost of conversion, whatever fee is quoted separately.
FX markup
Markup % = (offered rate - mid rate) / mid rate × 100
Figures are estimates based on the inputs given. Bank charges, regulatory minima and market rates change and differ between institutions and jurisdictions. This is not financial advice — confirm with your bank or treasury policy.
Under 0.5% is competitive for major currencies; airport and card conversions can exceed 4%.
Because it is the only neutral reference — the provider's own buy and sell rates already contain the margin.