Convert ring sizes between Brazil, the US, Europe, the UK, Russia and Japan using inner circumference as the reference.
Ring sizes vary by country: Brazil uses its own numbering (6 to 30), the US uses fractions (3¾ to 13), Europe (ISO) uses the inner circumference in millimetres (46 to 70), the UK uses letters, and Russia and Japan use different numeric systems. This converter uses a table based on the inner finger circumference (mm), the most reliable method for comparing systems. Select the source and target country and choose the size. For example, Brazilian size 14 equals US 6¾ and European 54 (mm).