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RING SIZE GUIDE - Maiko Nagayama Jewellery|マイコナガヤマ

International Ring Size Conversion Chart

Use this chart to convert your local standard sizes to your UK ring sizes for ordering. Please note that in most gold rings the larger sizes are more expensive.

U.S. Size Diameter
in Inches
Diameter
in MM
Metric MM
Equivalent
British French German Japanese Swiss
0000 .390 9.91   -        
00 .422 10.72   -        
0 .454 11.53   -        
1/2 .474 11.95   A        
3/4 .482 12.18   A 1/2        
1 .487 12.37 38.9 B     1  
1 1/4 - 12.60 39.6 B 1/2        
1 1/2 .503 12.78 40.2 C        
1 3/4 - 13.00 40.8 C 1/2        
2 .520 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 .536 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 .553 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 .569 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 .585 14.86 46.5 H 1/2 - 15 7  
4 1/4 - 15.04 47.1 47 3/4     7 3/4
4 1/2 .601 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 .618 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 .634 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 .650 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 .666 16.92 52.8 N 54 17 13 14
6 3/4 - 17.13 53.4 N 1/2 -      
7 .683 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 .699 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 .716 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 .732 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 .748 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 .764 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 .781 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 .797 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 .814 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 .830 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 .846 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 .862 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 .879 22.33 69.1 - - 22 27