British Pound is 2.36x smaller than Japanese Yen. This page compares the live size of British Pound and Japanese Yen.
Relative size = Japanese Yen fx market cap / British Pound 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 British Pound as Asset A with Japanese Yen as Asset B, using Japanese Yen fx market cap as the target size.
Relative size = Japanese Yen fx market cap / British Pound fx market cap.
Direction matters. British Pound with Japanese Yen's fx market cap is different from Japanese Yen with British Pound's fx market cap because the starting price, supply, shares, or size metric changes.