Ring size guide

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Diameter Circumference UK US EU
14.07 mm 0.554 inch 44.2 mm 1.74 inch F 3 4.25
14.27 mm 0.562 inch 44.8 mm 1.77 inch F½ 3¼ 4.75
14.48 mm 0.57 inch 45.5 mm 1.79 inch G 3½ 5.5
14.68 mm 0.578 inch 46.1 mm 1.82 inch G½ 3¾ 6
14.88 mm 0.586 inch 46.8 mm 1.84 inch H 4 6.75
15.09 mm 0.594 inch 47.4 mm 1.87 inch H½ 4¼ 7.5
15.29 mm 0.602 inch 48 mm 1.89 inch I 4½ 8
15.49 mm 0.61 inch 48.7 mm 1.92 inch J 4¾ 8.75
15.70 mm 0.618 inch 49.3 mm 1.94 inch J½ 5 9.25
15.90 mm 0.626 inch 50.0 mm 1.97 inch K 5¼ 10
16.10 mm 0.634 inch 50.6 mm 1.99 inch K½ 5½ 10.5
16.31 mm 0.642 inch 51.2 mm 2.02 inch L 5¾ 11.25
16.51 mm 0.65 inch 51.9 mm 2.04 inch L½ 6 11.75
16.71 mm 0.658 inch 52.5 mm 2.07 inch M 6¼ 12.5
16.92 mm 0.666 inch 53.1 mm 2.09 inch M½ 6½ 13.25
17.12 mm 0.674 inch 53.8 mm 2.12 inch N 6¾ 13.75
17.32 mm 0.682 inch 54.4 mm 2.14 inch N½ 7 14.5
17.53 mm 0.69 inch 55.1 mm 2.17 inch O 7¼ 15
17.73 mm 0.698 inch 55.7 mm 2.19 inch O½ 7½ 15.75
17.93 mm 0.706 inch 56.3 mm 2.22 inch P 7¾ 16.25
18.14 mm 0.714 inch 57.0 mm 2.24 inch P½ 8 17
18.34 mm 0.722 inch 57.6 mm 2.27 inch Q 8¼ 17.5
18.54 mm 0.73 inch 58.3 mm 2.29 inch Q½ 8½ 18.25
18.75 mm 0.738 inch 58.9 mm 2.32 inch R 8¾ 19
18.95 mm 0.746 inch 59.5 mm 2.34 inch R½ 9 19.5
19.15 mm 0.754 inch 60.2 mm 2.37 inch S 9¼ 20.25
19.35 mm 0.762 inch 60.8 mm 2.39 inch S½ 9½ 20.75
19.56 mm 0.77 inch 61.4 mm 2.42 inch T 9¾ 21.5
19.76 mm 0.778 inch 62.1 mm 2.44 inch T½ 10 22
19.96 mm 0.786 inch 62.7 mm 2.47 inch U 10¼ 22.75
20.17 mm 0.794 inch 63.4 mm 2.49 inch U½ 10½ 23.25
20.37 mm 0.802 inch 64.0 mm 2.52 inch V 10¾ 24
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