Japanese Yen is 3.44x larger than Brazilian Real. This page compares the live size of Japanese Yen and Brazilian Real.
Relative size = Brazilian Real 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 Brazilian Real as Asset B, using Brazilian Real fx market cap as the target size.
Relative size = Brazilian Real fx market cap / Japanese Yen fx market cap.
Direction matters. Japanese Yen with Brazilian Real's fx market cap is different from Brazilian Real with Japanese Yen's fx market cap because the starting price, supply, shares, or size metric changes.