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Ring Sizing

Inside Diameter  Sizes
MM MM British
Australian		  US
Canada		 French
Russian		 German Japanese Swiss
9.91 31.13 - 0 - - - -
10.72 33.68 - 0 - - - -
11.53 36.22 - 0 - - - -
11.95 37.54 A  1/2 - - - -
12.18 38.26 A 1/2  3/4 - - - -
12.37 38.86 B 1 - - 1 -
12.6 39.58 B 1/2 1 1/4 - - - -
12.78 40.15 C 1 1/2 - - - -
13 40.84 C 1/2 1 3/4 - - - -
13.21 41.5 D 2 41 1/2 13 1/2 2 1 1/2
13.41 42.13 D 1/2 2 1/4 - - - -
13.61 42.76 E 2 1/2 42 3/4 13 3/4 3 2 3/4
13.83 43.45 E 1/2 2 3/4 - - - -
14.05 44.14 F 3 44 14 4 4
14.15 44.45 F 1/2 3 1/8 - - - -
14.25 44.77 F 3/4 3 1/4 - - - -
14.36 45.11 G 3 3/8 45 1/4 - 5 5 1/4
14.45 45.4 G 1/4 3 1/2 - 14 1/2 - -
14.56 45.74 G 1/2 3 5/8 - - 6 -
14.65 46.02 H 3 3/4 46 1/2 - - 6 1/2
14.86 46.68 H 1/2 4 - 15 7 -
15.04 47.25 I 4 1/4 47 3/4 - - 7 3/4
15.27 47.97 I 1/2 4 1/2 - 15 1/4 8 -
15.4 48.38 J 4 5/8 49 15 1/2 - 9
15.53 48.79 J 1/4 4 3/4 - - - -
15.7 49.32 J 1/2 5 - 15 3/4 9 -
15.8 49.64 K 5 1/8 50 - - 10
15.9 49.95 K 1/4 5 1/4 - - - -
16 50.27 K 1/2 5 3/8 - - 10 -
16.1 50.58 L 5 1/2 51 3/4 16 - 11 3/4
16.3 51.21 L 1/4 5 3/4 - - - -
16.41 51.55 L 1/2 5 7/8 - - - -
16.51 51.87 M 6 52 3/4 16 1/2 12 12 3/4
16.71 52.5 M 1/2 6 1/4 - - - -
16.92 53.16 N 6 1/2 54 17 13 14
17.13 53.82 N 1/2 6 3/4 - - - -
17.35 54.51 O 7 55 1/4 17 1/4 14 15 1/4
17.45 54.82 O 1/2 7 1/4 - - - -
17.75 55.76 P 7 1/2 56 1/2 17 3/4 15 16 1/2
17.97 56.45 P 1/2 7 3/4 - - - -
18.19 57.15 Q 8 57 3/4 18 16 17 3/4
18.35 57.65 Q 1/2 8 1/4 - - - -
18.53 58.21 Q 3/4 8 1/2 - 18 1/2 17 -
18.61 58.47 R 8 5/8 59 - - 19
18.69 58.72 R 1/4 8 3/4 - - - -
18.8 59.06 R 1/2 8 7/8 - - - -
18.89 59.34 R 3/4 9 - 19 18 -
19.1 60 S 9 1/8 60 1/4 - - 20 1/4
19.22 60.38 S 1/4 9 1/4 - - - -
19.31 60.66 S 1/2 9 3/8 - - - -
19.41 60.98 S 3/4 9 1/2 - 19 1/2 19 -
19.51 61.29 T 9 5/8 61 1/2 - - 21 1/2
19.62 61.64 T 1/4 9 3/4 - - - -
19.84 62.33 T 1/2 10 - 20 20 -
20.02 62.89 U 10 1/4 62 3/4 - 21 22 3/4
20.2 63.46 U 1/2 10 1/2 - 20 1/4 22 -
20.32 63.84 V 10 5/8 63 - - 23 3/4
20.44 64.21 V 1/4 10 3/4 - - - -
20.68 64.97 V 1/2 11 - 20 3/4 23 -
20.76 65.22 W 11 1/8 65 - - 25
20.85 65.5 W 1/4 11 1/4 - - - -
20.94 65.78 W 1/2 11 3/8 - - - -
21.08 66.22 W 3/4 11 1/2 - 21 24 -
21.18 66.54 X 11 5/8 66 1/4 - - 26 1/4
21.24 66.73 X 1/4 11 3/4 - - - -
21.3 66.92 X 1/2 11 7/8 - - - -
21.49 67.51 Y 12 67 1/2 21 1/4 25 27 1/2
21.69 68.14 Y 1/2 12 1/4 - - - -
21.89 68.77 Z 12 1/2 68 3/4 21 3/4 26 28 3/4
22.1 69.43 Z +1/2 12 3/4 - - - -
22.33 70.15 Z+1 13 - 22 27 -
22.6 71 Z+1.5 13.5 - - - -
22.69 71.28 Z+2 - - - - -
22.92 72 Z+2.5 - - - - -
23.06 72.45 Z+3 - - - - -
23.24 73.01 Z+3.5 - - - - -
23.47 73.73 Z+4 - - - - -
23.55 73.98 Z+4.5 - - - - -
23.87 74.99 Z+5 - - - - -
24.27 76.25 Z+6 - - - - -