Euro is 6.57x larger than Brazilian Real. This page compares the live size of Euro and Brazilian Real.
Relative size = Brazilian Real 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 Brazilian Real as Asset B, using Brazilian Real fx market cap as the target size.
Relative size = Brazilian Real fx market cap / Euro fx market cap.
Direction matters. Euro with Brazilian Real's fx market cap is different from Brazilian Real with Euro's fx market cap because the starting price, supply, shares, or size metric changes.