Ring Size Conversion Chart

Circumference (mm) Inside Diameter (mm) NZ, Australia & UK USA & Canada China, Japan & Singapore
44.2 14.1 F 3 4
45.5 14.5 G 3 1/2 5 1/2
46.8 14.9 H 4 7
48.0 15.3 I 4 1/2 8
48.7 15.5 J 4 3/4 8 1/2
50.0 15.9 K 5 1/4 9 1/2
51.2 16.3 L 5 3/4 10 1/2
52.5 16.7 M 6 1/4 12
53.8 17.1 N 6 3/4 13 1/2
55.1 17.5 O 7 1/4 14 1/2
56.3 17.9 P 7 3/4 15 1/2
57.6 18.3 Q 8 1/4 16 1/2
58.9 18.8 R 8 3/4 17 1/2
60.2 19.2 S 9 1/4 18 1/2
61.4 19.6 T 9 3/4 19 1/2
62.7 20.0 U 10 1/4 21
64.0 20.4 V 10 3/4 22 1/2
65.3 20.8 W 11 1/4 23 1/2
66.6 21.2 X 11 3/4 24 1/2
67.8 21.6 Y 12 1/4 25 1/2
68.5 21.8 Z 12 1/2 26
70.4 22.4 Z+1 13 1/4 27 1/2