International Ring Sizes Chart

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Dia. INCH Dia.MM Circ. MM USA
US		 British
UK		 French
France		 German
Germany		 Japan
Japan		 Swiss
Swiss
.390 9.91   0000          
.422 10.72   00          
.454 11.53   0          
.474 11.95   1/2 A        
482 12.18   3/4 A 1/2        
.487 12.37 38.9 1 B     1  
  12.60 39.6 1 1/4 B 1/2        
503 12.78 40.2 1 1/2 C        
  13.00 40.8 1 3/4 C 1/2        
.520 13.21 41.5 2 D 41 1/2 13 1/2 2 1 1/2
  13.41 42.1 2 1/4 D 1/2        
.536 13.61 42.7 2 1/2 E 42 3/4 13 3/4 3 2 3/4
  13.83 43.4 2 3/4 E 1/2        
553 14.05 44.0 3 F 44 14 4 4
  14.15 44.3 3 1/8 F 1/2        
  14.25 44.6 3 1/4          
  14.36 44.9 3 3/8 G 45 1/4   5 5 1/4
.569 14.45 45.2 3 1/2     14 1/2    
  14.56 45.6 3 5/8 G 1/2     6  
  14.65 45.9 3 3/4 H 46 1/2     6 1/2
.585 14.86 46.5 4 H 1/2   15 7  
  15.04 47.1 4 1/4 I 47 3/4     7 3/4
.601 15.27 47.8 4 1/2 I 1/2   15 1/4 8  
  15.40 48.1 4 5/8 J 49 15 1/2   9
  15.53 48.4 4 3/4        
Dia. INCH Dia.MM Circ. MM US UK France Germany Japan Swiss
.618 15.70 49.0 5 J 1/2   15 3/4 9  
  15.80 49.3 5 1/8 K 50     10
  15.90 49.6 5 1/4          
  16.00 50.0 5 3/8 K 1/2     10  
.634 16.10 50.3 5 1/2 L 51 3/4 16   11 3/4
  16.30 50.9 5 3/4          
  16.41 51.3 5 7/8 L 1/2        
.650 16.51 51.5 6 M 52 3/4 16 1/2 12 12 3/4
  16.71 52.2 6 1/4 M 1/2        
.666 16.92 52.8 6 1/2 N 54 17 13 14
  17.13 53.4 6 3/4 N 1/2        
.683 17.35 54.0 7 O 55 1/4 17 1/4 14 15 1/4
  17.45 54.7 7 1/4 O 1/2        
.699 17.75 55.3 7 1/2 P 56 1/2 17 3/4 15 16 1/2
  17.97 55.9 7 3/4 P 1/2        
.716 18.19 56.6 8 Q 57 3/4 18 16 17 3/4
  18.35 57.2 8 1/4 Q 1/2        
.732 18.53 57.8 8 1/2     18 1/2 17  
  18.61 58.4 8 5/8 R 59     19
  18.69 58.4 8 3/4          
  18.80 59.0 8 7/8 R 1/2        
.748 18.89 59.1 9     19 18  
Dia. INCH Dia.MM Circ. MM US UK France Germany Japan Swiss
  19.10 59.4 9 1/8 S 60 1/4     20 1/4
  19.22 59.7 9 1/4          
  19.31 60.0 9 3/8 S 1/2        
.764 19.41 60.3 9 1/2     19 1/2 19  
  19.51 60.6 9 5/8 T 61 1/2     21 1/2
  19.62 60.9 9 3/4          
.781 19.84 61.6 10 T 1/2   20 20  
  20.02 62.2 10 1/4 U 62 3/4   21 22 3/4
.797 20.20 62.8 10 1/2 U 1/2   20 1/4 22  
  20.32 63.1 10 5/8 V 63     23 3/4
  20.44 63.5 10 3/4          
.814 20.68 64.1 11 V 1/2   20 3/4 23  
  20.76 64.3 11 1/8 W 65     25
  20.85 64.7 11 1/4          
  20.94 65.0 11 3/8 W 1/2        
  21.08 65.3 11 1/2     21 24  
.830 21.18 65.7 11 5/8 X 66 1/4     26 1/4
  21.24 66.0 11 3/4          
  21.30 66.3 11 7/8 X 1/2        
.846 21.49 66.6 12 Y 67 1/2 21 1/4 25 27 1/2
  21.69 67.2 12 1/4 Y 1/2        
.862 21.89 67.9 12 1/2 Z 68 3/4 21 3/4 26 28 3/4
  22.10 68.5 12 3/4 Z 1/2        
.879 22.33 69.1 13     22 27