US Dollar is 7.20x larger than British Pound. This page compares the live size of US Dollar and British Pound.
Relative size = British Pound fx market cap / US Dollar 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 US Dollar 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 / US Dollar fx market cap.
Direction matters. US Dollar with British Pound's fx market cap is different from British Pound with US Dollar's fx market cap because the starting price, supply, shares, or size metric changes.