Ring Sizing Chart

Inside diameter Inside circumference Sizes
(in) (mm) (in) (mm) United States, Canada and Mexico United Kingdom, Ireland, Australia, South Africa and New Zealand Italy, Spain, Switzerland
0.57 14.48 1.79 45.5 3 1/2 G 5.5
0.578 14.68 1.82 46.1 3 3/4 G 1/2 6
0.586 15.09 1.84 46.8 4 H 6.75
0.594 15.09 1.87 47.4 4 1/4 H 1/2 7.5
0.602 15.29 1.89 48 4 1/2 I 8
0.61 15.49 1.92 48.7 4 3/4 J 8.75
0.618 15.7 1.94 49.3 5 J 1/2 9.25
0.626 15.9 1.97 50 5 1/4 K 10
0.634 16.1 1.99 50.6 5 1/2 K 1/2 10.5
0.642 16.31 2.02 48.7 5 3/4 L 11.25
0.65 16.51 2.04 51.9 6 L 1/2 11.75
0.634 16.1 1.99 50.6 5 1/2 K 1/2 10.5
0658 16.71 2.07 52.5 6 1/4 M 12.5
0.666 16.92 2.09 53.1 6 1/2 M 1/2 13.25
0.674 17.12 2.12 53.8 6 3/4 N 13.75
0.682 17.32 2.14 54.4 7 N 1/2 14.5
0.69 17.53 2.17 55.1 7 1/4 O 15
0.698 17.73 2.19 55.7 7 1/2 O 1/2 15.75
0.706 17.93 2.22 56.3 7 3/4 P 16.25
0.714 18.14 2.24 57 8 P 1/2 17
0.722 18.34 2.27 57.6 8 1/4 Q 17.25
0.73 18.54 2.29 58.3 8 1/2 Q 1/2 18.25
0.738 18.75 2.32 58.9 8 3/4 R 19
0.746 18.95 2.34 59.5 9 R 1/2 19.5
0.754 19.15 2.37 60.2 9 1/4 S 20.25
0.762 19.35 2.39 60.8 9 1/2 S 1/2 20.75
0.77 19.56 2.42 61.4 9 3/4 T 21.5
0.778 19.76 2.44 62.1 10 T 1/2 22
0.786 19.96 2.47 62.7 10 1/4 U 22.75
0.794 20.17 2.49 63.4 10 1/2 U 1/2 23.35
0.802 20.37 2.52 64 10 3/4 V 24
0.81 20.57 2.54 64.6 11 V 1/2 24.75
0.818 20.78 2.57 65.3 11 1/4 W 25.25
0.826 20.98 2.59 65.9 11 1/2 W 1/2 26
0.834 21.18 2.62 66.6 11 3/4 X 26.5
0.842 21.39 2.65 67.2 12 X 1/2 27.75
0.85 21.59 2.67 67.8 12 1/4 Y 27.75
0.858 21.79 2.7 68.5 12 1/2 Z 28.5