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Standard Reference Chart for Ring Size Conversion

Use this chart to convert your local standard to any other international one.

US Size
Diameter
in MM
Metric -
Circumference
British
French
German
Japanese
Swiss
0000 9.91  
-
        
00 10.72  
-
        
0 11.53  
-
        
1/2 11.95   A        
3/4 12.18   A 1/2        
1 12.37 38.9 B     1  
1 1/4 12.60 39.6 B 1/2        
1 1/2 12.78 40.2 C        
1 3/4 13.00 40.8 C 1/2        
2 13.21 41.5 D 41 1/2 13 1/2 2 1 1/2
2 1/4 13.41 42.1 D 1/2
-
-
    
2 1/2 13.61 42.7 E 42 3/4 13 3/4 3 2 3/4
2 3/4 13.83 43.4 E 1/2
-
-
    
3 14.05 44.0 F 44 14 4 4
3 1/8 14.15 44.3 F 1/2
-
-
    
3 1/4 14.25 44.6
-
-
-
    
3 3/8 14.36 44.9 G 45 1/4
-
 5 5 1/4
3 1/2 14.45 45.2
-
-
 14 1/2    
3 5/8 14.56 45.6 G 1/2
-
   6  
3 3/4 14.65 45.9 H 46 1/2     6 1/2
4 14.86 46.5 H 1/2
-
 15 7  
4 1/4 15.04 47.1 I 47 3/4     7 3/4
4 1/2 15.27 47.8 I 1/2
-
 15 1/4 8  
4 5/8 15.40 48.1 J 49 15 1/2   9
4 3/4 15.53 48.4
-
-
      
5 15.70 49.0 J 1/2
-
 15 3/4 9  
5 1/8 15.80 49.3 K 50     10
5 1/4 15.90 49.6
-
-
      
5 3/8 16.0 50.0 K 1/2
-
   10  
5 1/2 16.10 50.3 L 51 3/4 16   11 3/4
5 3/4 16.30 50.9
-
-
      
5 7/8 16.41 51.3 L 1/2
-
      
6 16.51 51.5 M 52 3/4 16 1/2 12 12 3/4
6 1/4 16.71 52.2 M 1/2
-
      
6 1/2 16.92 52.8 N 54 17 13 14
7 17.35 54.0 O 55 1/4 17 1/4 14 15 1/4
7 1/4 17.45 54.7 O 1/2
-
      
7 1/2 17.75 55.3 P 56 1/2 17 3/4 15 16 1/2
7 3/4 17.97 55.9 P 1/2
-
      
8 18.19 56.6 Q 57 3/4 18 16 17 3/4
8 1/4 18.35 57.2 Q 1/2
-
      
8 1/2 18.53 57.8
-
-
 18 1/2 17  
8 5/8 18.61 58.4 R 59     19
8 3/4 18.69 58.4
-
-
      
8 7/8 18.80 59.0 R 1/2
-
      
9 18.89 59.1
-
-
 19 18  
9 1/8 19.10 59.4 S 60 1/4     20 1/4
9 1/4 19.22 59.7
-
-
      
9 3/8 19.31 60.0 S 1/2
-
      
9 1/2 19.41 60.3
-
-
 19 1/2 19  
9 5/8 19.51 60.6 T 61 1/2     21 1/2
9 3/4 19.62 60.9
-
-
      
10 19.84 61.6 T 1/2
-
 20 20  
10 1/4 20.02 62.2 U 62 3/4   21 22 3/4
10 1/2 20.20 62.8 U 1/2
-
20 1/4
 22  
10 5/8 20.32 63.1 V 63     23 3/4
10 3/4 20.44 63.5
-
-
      
11 20.68 64.1 V 1/2
-
 20 3/4 23  
11 1/8 20.76 64.3 W 65     25
11 1/4 20.85 64.7
-
-
      
11 3/8 20.94 65.0 W 1/2
-
      
11 1/2 21.08 65.3
-
-
 21 24  
11 5/8 21.18 65.7 X 66 1/4     26 1/4
11 3/4 21.24 66.0
-
-
      
11 7/8 21.30 66.3 X 1/2
-
      
12 21.49 66.6 Y 67 1/2 21 1/4 25 27 1/2
12 1/4 21.69 67.2 Y 1/2
-
      
12 1/2 21.89 67.9 Z 68 3/4 21 3/4 26 28 3/4
12 3/4 22.10 68.5 Z 1/2
-
      
13 22.33 69.1
-
-
 22 27  
13 1/4 22.4 69.7
-
        
13 1/2 22.6 71.0 Z+2     30.2 31.4
13 3/4 22.8 71.6
-
        
14 23.0 72.3 Z+3     31.4 32.7
14 1/4 23.2 72.9
-
        
14 1/2 23.4 73.5 Z+4     32.7 34
14 3/4 23.6 74.2
-
        
15 23.8 74.8 Z+5     33.9 35.3
15 1/4 24.0 75.4
-
        
15 1/2 24.2 76.1 Z+6     35.2 36.6
15 3/4 24.4 76.7
-
        
16 24.6 77.4 Z+7     36.4 37.9
16 1/4 24.8 78.0
-
        
16 1/2 25.0 78.6 Z+8     37.6 39.2
16 3/4 25.2 79.3
-
        
17 25.5 79.9 Z+9     38.9 40.5