Ring Size Chart

Circumference
(mm)		 Diameter
(mm)		 USA / CA UK / AU; JAPAN GERMANY FRANCE SWISS
46.68 14.82 4.0 H 1/2 7 15 46 1/2 6 1/2
47.75 15.20 4.5 I 1/2 8 15 1/4 47 3/4 7 3/4
49.07 15.62 5.0 J 1/2 9 15 3/4 49 10
50.35 16.03 5.5 L 10 16 51 3/4 11 3/4
51.58 16.42 6.0 M 12 16 1/2 52 3/4 12 3/4
52.27 16.64 6.5 N 13 17 54 14
54.52 17.23 7.0 O 14 17 1/4 55 1/4 15 1/4
55.32 17.61 7.5 P 15 17 3/4 56 1/2 16 1/2
56.73 18.06 8.0 Q 16 18 57 3/4 17 3/4
57.71 18.37 8.5 Q 3/4 17 18 1/2 59 19
59.12 18.82 9.0 R 3/4 18 19 60 1/4 20 1/4
60.72 19.33 9.5 S 3/4 19 19 1/2 61 1/2 21 1/2
62.04 19.75 10.0 T 1/2 20 20 62 3/4 22 3/4
63.24 20.13 10.5 U 1/2 22 20 1/4 63 23 3/4
64.43 20.51 11.0 V 1/2 23 20 3/4 65 25
65.81 20.95 11.5 W 3/4 24 21 66 1/4 26 1/4
67.07 21.35 12.0 Y 25 21 1/4 67 1/2 27 1/2
68.17 21.70 12.5 Z 26 21 3/4 68 3/4 28 3/4
69.30 22.06 13.0 Z + 1 27 22 - -
70.62 22.48 13.5 Z + 1 1/2 - - - -
71.84 22.87 14.0 Z + 2 - - - -