Euro is 4.50x larger than British Pound. This page compares the live size of Euro and British Pound.
Relative size = British Pound fx market cap / Euro fx market cap.
Fiat comparisons use money-supply and currency-rate based size metrics, so the result is a supply-scale comparison rather than a spot FX forecast.
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It compares Euro as Asset A with British Pound as Asset B, using British Pound fx market cap as the target size.
Relative size = British Pound fx market cap / Euro fx market cap.
Direction matters. Euro with British Pound's fx market cap is different from British Pound with Euro's fx market cap because the starting price, supply, shares, or size metric changes.