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  • RING SIZE CHART
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General Interest
INTERNATIONAL RING SIZE CHART
Inside Diameter
(mm)
Inside Circumference
(mm)
Number Sizes
US/Canada
Standard
Wheat Sheaf British Irish
Australian
Japanese
Equivalent
Swiss
Equivalent
14.10 44.20 3.00 F 4 4
14.30 44.80 3.25 F 1/2 5 5.25
14.50 45.50 3.50 G    
14.70 46.10 3.75 G 1/2 6 6.5
14.90 46.70 4.00 H 7  
15.10 47.40 4.25 H 1/2   7.75
15.30 48.00 4.50 I 8  
15.50 48.70 4.75 J   9
15.70 49.30 5.00 J 1/2 9  
15.90 49.90 5.25 K   10
16.10 50.60 5.50 K 1/2 10  
16.30 51.20 5.75 L   11.75
16.50 51.80 6.00 L 1/2 11 12.75
16.70 52.50 6.25 M 12  
16.90 53.10 6.50 M 1/2 13 14
17.10 53.80 6.75 N    
17.30 54.40 7.00 N 1/2 14 15.25
17.50 55.00 7.25 O    
17.70 55.70 7.50 O 1/2 15 16.5
17.90 56.30 7.75 P    
18.10 56.90 8.00 P 1/2 16 17.75
18.30 57.60 8.25 Q    
18.50 58.20 8.50 Q 1/2 17  
18.70 58.90 8.75 R   19
18.90 59.50 9.00 R 1/2 18  
19.20 60.10 9.25 S   20.25
19.40 60.80 9.50 S 1/2 19  
19.60 61.40 9.75 T   21.5
19.80 62.10 10.00 T 1/2 20  
20.00 62.70 10.25 U 21  
20.20 63.30 10.50 U 1/2 22 22.75
20.40 64.00 10.75 V    
20.60 64.60 11.00 V 1/2 23  
20.80 65.20 11.25 W   25
21.00 65.90 11.50 W 1/2 24  
21.20 66.50 11.75 X    
21.40 67.20 12.00 X 1/2 25 27.5
21.60 67.80 12.25 Y    
21.80 68.40 12.50 Z 26 28.75
22.00 69.10 12.75 Z 1/2    
22.20 69.70 13.00   27  
22.40 70.30 13.25 Z1    
22.60 71.00 13.50      
22.80 71.60 13.75 Z2    
23.00 72.30 14.00 Z3    
23.20 72.90 14.25      
23.40 73.50 14.50 Z4    
23.60 74.20 14.75      
23.80 74.80 15.00      
24.00 75.40 15.25      
24.20 76.10 15.50      
24.40 76.70 15.75      
24.60 77.40 16.00