Ring Sizes

Circumference
(mm)
Diameter
(mm)
UK, Europe,
& Australia
United States
& Canada
China SG/JP HK Switzerland
44.2 14.1 3 6 4 6 4
44.8 14.3 G     5  
45.5 14.5 7   7.5  
46.1 14.7 H     6  
46.8 14.9 4 8 7 9  
47.4 15.1 I   9    
48.0 15.3   8 10  
48.7 15.5 J         9
49.3 15.7 5 10 9 11  
50.0 15.9 K         10
50.6 16.1 11 10 12  
51.2 16.3 L         11¾
51.9 16.5 6 12 11 13 12¾
52.5 16.7 M   13 12    
53.1 16.9   13 14.5 14
53.8 17.1 N   14      
54.4 17.3 7   14 16 15¼
55.1 17.5 O   15      
55.7 17.7   15 17 16½
56.3 17.9 P   16      
57.0 18.1 8 17 16   17¾
57.2 18.2         18  
57.6 18.3 Q          
58.3 18.5 18 17 19  
58.9 18.8 R         19
59.5 19.0 9 19 18 20.5  
60.2 19.2 S   20     20¼
60.8 19.4   19 22  
61.4 19.6 T   21     21½
62.1 19.8 10   20 23  
62.7 20.0 U   22 21    
63.4 20.2 10½   22 24 22¾
64.0 20.4 V   23      
64.6 20.6 11   23 25  
65.3 20.8 W   24     25
65.9 21.0 11½ 25 24 26  
66.6 21.2 X          
67.2 21.4 12 26 25 27.75 27½
67.8 21.6 Y          
68.5 21.8 Z 12½   26   28¾
69.1 22.0          
69.7 22.2   13   27 30  
70.4 22.4 Z+1          
71.0 22.6 Z+2 13½        


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