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Ring Size Converter.

Find your ring size in US, UK and EU formats. Enter your finger's diameter or circumference in mm to find your size.

Or select from the chart

Complete Ring Size Chart

US / CanadaUK / AUEU / GermanDiameter (mm)Circumference (mm)
4 H 46.5 14.8 mm 46.5 mm
4.5 I 47.8 15.2 mm 47.8 mm
5 J½ 49 15.6 mm 49.0 mm
5.5 K½ 50.3 16.0 mm 50.3 mm
6 L½ 51.5 16.4 mm 51.5 mm
6.5 M½ 52.8 16.8 mm 52.8 mm
7 N½ 54 17.2 mm 54.0 mm
7.5 O½ 55.3 17.6 mm 55.3 mm
8 P½ 56.6 18.0 mm 56.6 mm
8.5 Q½ 57.8 18.4 mm 57.8 mm
9 R½ 59 18.8 mm 59.0 mm
9.5 S½ 60.3 19.2 mm 60.3 mm
10 T½ 61.6 19.6 mm 61.6 mm
10.5 U½ 62.8 20.0 mm 62.8 mm
11 V½ 64 20.4 mm 64.0 mm
11.5 W½ 65.3 20.8 mm 65.3 mm
12 X½ 66.6 21.2 mm 66.6 mm

How to measure

Wrap a strip of paper or thin string around your finger. Mark where it overlaps and measure the length — that is your circumference. Divide by π (3.14159) to get diameter. Use the inputs above to find your size.