Ring Size Conversion Chart

Circum mm Diameter mm Ring size EU UK USA
37.8 12.04 12 38 A 0.5
39.1 12.45 12.5 39 B 1
40.4 12.85 13 40 C 1.5
41.7 13.36 13.5 42 D 2
42.9 13.67 13.5 43 E 2.5
44.2 14.07 14 44 F 3
45.5 14.48 14.5 45 G 3.5
46.8 14.88 15 47 H 4
48 15.29 15 48 I 4.5
48.7 15.49 15.5 49 J 5
50 15.9 16 50 K 5.5
51.2 16.31 16 51 L 6
52.5 16.71 16.5 52 M 6.5
53.8 17.12 17 54 N 7
55.1 17.53 17.5 55 O 7.5
56.3 17.93 18 56 P 8
57.6 18.34 18 58 Q 8.5
58.9 18.75 18.5 59 R 9
60.2 19.15 19 60 S 9.5
61.4 19.56 19.5 61 T 10
62.7 19.96 20 63 U 10.5
64 20.37 20 64 V 11
65.3 20.78 20.5 65 W 11.5
66.6 21.18 21 67 X 12
67.8 21.59 21.5 68 Y 12.5
68.5 21.79 22 67 Z 13