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Ring Size Converter.

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.