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International Ring Size Conversion Chart

Inside Circumference                                     Sizes                                                     
     MM            Inches     British & Australian US & Canada French & Russian German Japanese Swiss
31.13 1.22 - 0000 - - - -

33.68

1.39 - 00 - - - -
36.22 1.43 - 0 - - - -
37.54 1.49 A 1/2 - - - -
38.26 1.51 A 1/2 3/4 - - - -
38.86 1.53 B 1 - - 1 -
39.58 1.56 B 1/2 1 1/4 -

-

- -
40.15 1.58 C 1 1/2 - - - -
40.84 1.61 C 1/2 1 3/4 - - - -
41.50 1.63 D 2 41 1/2 13 1/2 2 1 1/2
42.13 1.66 D 1/2 2 1/4 - - - -
42.76 1.68 E 2 1/2 42 3/4 13 3/4 3 2 3/4
43.45 1.71 E 1/2 2 3/4 - - - -
44.14 1.74 F 3 44 14 4 4
44.45 1.75 F 1/2 3 1/8 - - - -
44.77 1.76 F 3/4 3 1/4 - - - -
45.11 1.77 G 3 3/8 45 1/4 - 5 5 1/4
45.40 1.79 G 1/4 3 1/2 - 14 1/2 - -
45.74 1.80 G 1/2 3 5/8 - - 6 -
46.02 1.81 H 3 3/4 46 1/2 - 6 1/2
46.68 1.84 H 1/2 4 - 15 7 -
47.25 1.86 I 4 1/4 47 3/4 - - 7 3/4
47.97 1.89 I 1/2 4 1/2 - 15 1/4 8 -

48.38

1.90 J 4 5/8 49 15 1/2 - 9
48.79

1.92

J 1/4 4 3/4 - - - -
49.32 1.94 J 1/2 5 - 15 3/4 9 -
49.64 1.95 K 5 1/8 50 - - 10
49.95 1.97 K 1/4 5 1/4 - - - -
50.27 1.98 K 1/2 5 3/8 - - 10 -
50.58 1.99 L 5 1/2 51 3/4 16 12 12 3/4
51.21 2.02 L 1/4 5 3/4 - - - -
51.55 2.03 L 1/2 5 7/8 - - - -
51.87 2.04 M 6 52 3/4 16 1/2 12 12 3/4
52.50 2.07 M 1/2 6 1/4 - - - -
53.16 2.09 N 6 1/2 54 17 13 14

53.82

2.12 N 1/2 6 3/4 - - - -
54.51 2.12 O 7 55 1/4 17 1/4 14 15 1/4
54.82 2.16 O 1/2 7 1/4 - - - -
55.76 2.20 P 7 1/2 56 1/2 17 3/4 15 16 1/2
56.45 2.22 P 1/2 7 3/4 - - - -
57.15 2.25 Q 8 57 3/4 18 16 17 3/4
57.65 2.27 Q 1/2 8 1/4 - - - -
58.21 2.29 Q 3/4 8 1/2 - 18 1/2 17 -
58.47 2.30 R 8 5/8 59 - - 19
58.72 2.31 R 1/4 8 3/4 - - - -
59.06 2.32 R 1/2 8 7/8 - - - -
59.34 2.35 R 3/4 9 - 19 18 -
60.00 2.36 S 9 1/8 60 1/4 - - 20 1/4
60.38 2.68 S 1/4 9 1/4 - - - -
60.66 2.39 S 1/2 9 3/8 - - - -
60.98 2.40 S 3/4 9 1/2 - 19 1/2 19 -
61.29 2.41 T 9 5/8 61 1/2 - - 21 1/2
61.64 2.43 T 1/4 9 3/4 - - - -
62.33 2.45 T 1/2 10 - 20 20 -
62.89 2.48 U 10 1/4 62 3/4 - 21 22 3/4
63.46 2.50 U 1/2 10 1/2 - 20 1/4 22 -
63.84 2.51 V 10 5/8 63 - - 23 3/4
64.21 2.53 V 1/4 10 3/4 - - - -
64.97 2.56 V 1/2 11 - 20 3/4 23 -
65.22 2.57 W 11 1/8 65 - - 25
65.50 2.58 W 1/4 11 1/4 - - - -
65.78 2.59 W 1/2 11 3/8 - - - -
66.22 2.61 W 3/4 11 1/2 - 21 24 -
66.54 2.62 X 11 5/8 66 1/4 - - 26 1/4
66.73 2.63 X 1/4 11 3/4 - - - -
66.92 2.64 X 1/2 11 7/8 - - - -
67.51 2.66 Y 12 67 1/2 21 1/4 25 27 1/2
68.14 2.68 Y 1/2 12 1/4 - -  - -
68.77 2.71 Z 12 1/2 68 3/4 21 3/4 26 28 3/4
69.43 2.73 Z +1/2 12 3/4 - - - -
70.15 2.76 Z+1 13 - 22 27 -
71.00 2.80 Z+1.5 13.5 - - - -