Ring Sizes

Diameter 15 15.5 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5
Russia 15 15.5 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5
Italy 7 9.5 11 12 13.5 14.5 17 19 21 22.5 24 25 26.5 29
USA 4 5 5.5 6 6.5 7 8 8.5 9.5 10 10.5 11 11.5 12.5


Diameter
(Inches)		 Size
(mm)		 Diameter
(mm)		 Japan USA
Canada		 UK Germany
Russia
0.553 44.0 14.05 4 3 F 14
0.569 45.2 14.45 3 1/2 14 1/2
0.585 46.5 14.86 7 4 H 1/2 15
0.601 47.8 15.27 8 4 1/2 I 1/2 15 1/2
0.618 49.0 15.7 9 5 J 1/2 15 3/4
0.634 50.3 16.1 11 5 1/2 L 16
0.650 51.5 16.51 12 6 M 16 1/2
0.666 52.8 16.92 13 6 1/2 N 17
0.683 54.0 17.35 14 7 O 17 1/4
0.699 55.3 17.75 15 7 1/2 P 17 3/4
0.716 56.6 18.19 16 8 Q 18
0.732 57.8 18.53 17 8 1/2 18 1/2
0.748 59.1 18.89 18 9 19
0.764 60.3 19.41 19 9 1/2 19 1/2
0.781 61.6 19.84 20 10 T 1/2 20
0.798 62.8 20.20 22 10 1/2 U 1/2 20 1/4
0.814 64.1 20.68 23 11 V 1/2 20 3/4
- 65.3 21.08 24 11 1/2 21
0.846 66.6 21.49 25 12 Y 21 1/4
0.862 67.9 21.89 26 12 1/2 Z 21 3/4
0.879 69.1 22.33 27 13 22
22.60 13 1/2 22 1/2
23.00 14 23
23.40 14 1/2 23 1/2
23.80 15 23 3/4
24.20 15 1/2 24 1/4
24.60 16 24 1/2