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Currency Exchange Spread Calculator

Measure the hidden cost in an exchange rate spread.

About Currency Exchange Spread Calculator

Most currency conversion cost hides in the rate rather than the stated fee. A four per cent spread on two thousand pounds costs eighty pounds regardless of a headline claiming no commission. Comparing providers on stated fees alone is exactly what makes the spread profitable, so the effective total fee is the only meaningful comparison.

Formula

Currency Exchange Spread

Spread = (mid-market rate − offered rate) ÷ mid-market rate

mid-market rate
The true rate, midway between buy and sell
spread
The margin taken by marking the rate away from mid-market

Worked example

With the default values below, Currency Exchange Spread Calculator returns Spread Against the Mid-Market Rate of 4.4882%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Interbank or mid-market rateminimum 0
1.27
Rate offered to youminimum 0
1.213
Amount to convertminimum 0
2,000
Stated feeminimum 0
4.99

Results

Spread Against the Mid-Market Rate
4.4882%
Hidden Cost in the Rate
$89.76
Total Cost Including the Stated Fee
$94.75
Amount Received
2,419.95
Effective Total Fee
4.7377%

Step by step

  1. 1Values used
  2. 2Currency Exchange Spread
  3. 3Spread Against the Mid-Market Rate= 4.4882
  4. 4Hidden Cost in the Rate= 89.76
  5. 5Total Cost Including the Stated Fee= 94.75
  6. 6Amount Received= 2,419.95
  7. 7Effective Total Fee= 4.7377

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Currency Exchange Spread calculated?

Spread = (mid-market rate − offered rate) ÷ mid-market rate Most currency conversion cost hides in the rate rather than the stated fee. A four per cent spread on two thousand pounds costs eighty pounds regardless of a headline claiming no commission.

Why does Currency Exchange Spread matter?

Comparing providers on stated fees alone is exactly what makes the spread profitable, so the effective total fee is the only meaningful comparison.

What values do I need to enter?

This calculator takes 4 inputs: Interbank or mid-market rate, Rate offered to you, Amount to convert, Stated fee. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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