Comparative table of the international sizes of rings

Japan Size
(Inches)
Diameter
(Inches)
Circle
(mm)
Diameter
(mm)
USA
CA
Great Britain Russia
Germany
Switzerland France
8 1.88 0.60 47.63 15.27 4 1/2 I-1/2 15 1/2 7 3/4 47 3/4
9 1.94 0.61 49.21 15.70 5 J-1/2 15 3/4 9 49
11 2.00 0.63 50.80 16.10 5 1/2 L 16 10 7/8 50 7/8
12 2.06 0.64 52.39 16.51 6 L-1/2 16 1/2 11 1/2 51 1/2
13 2.13 0.66 53.98 16.92 6 1/2 M-1/2 17 12 3/4 52 3/4
14 2.19 0.68 55.56 17.35 7 O 17 1/4 14 54
15 2.25 0.69 57.15 17.75 7 1/2 P 17 3/4 15 1/4 55 1/4
16 2.31 0.71 58.74 18.19 8 Q 18 16 1/2 56 1/2
17 2.38 0.72 60.33 18.53 8 1/2 R 18 1/2 17 3/4 57 3/4
18 2.44 0.74 61.91 18.89 9 S 19 19 59
19 2.50 0.76 63.50 19.41 9 1/2 --- 19 1/2 20 1/4 60 1/4
20 2.56 0.77 65.09 19.84 10 T-1/2 20 21 1/2 61 1/2
22 2.63 0.79 66.68 20.20 10 1/2 U-1/2 20 1/2 22 3/4 62 3/4
23 2.69 0.81 68.26 20.68 11 V-1/2 20 3/4 24 64
24 2.75 0.82 69.85 21.08 11 1/2 W-1/2 21 25 1/4 65 1/4
25 2.81 0.84 71.44 21.49 12 Y 21 1/4 26 1/2 66 1/2
26 2.88 0.85 73.03 21.89 12 1/2 Z 21 3/4 27 3/4 67 3/4
27 2.94 0.87 74.61 22.33 13 --- 22 29 69
 
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