Japanese Yen is 3.05x smaller than US Dollar. This page compares the live size of Japanese Yen and US Dollar.
Relative size = US Dollar fx market cap / Japanese Yen 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 Japanese Yen as Asset A with US Dollar as Asset B, using US Dollar fx market cap as the target size.
Relative size = US Dollar fx market cap / Japanese Yen fx market cap.
Direction matters. Japanese Yen with US Dollar's fx market cap is different from US Dollar with Japanese Yen's fx market cap because the starting price, supply, shares, or size metric changes.