US Size Inside Diameter (inches) Inside Diameter (mm) Inside Circumference (inches) Inside Circumference (mm) British Japanese Swiss

Ring Size Chart

NFC Ring Size* Inside Diameter (inches) Inside Diameter (mm) Inside Circumference (inches) Inside Circumference (mm) British Japanese Swiss
4 1/2 0.602 15.3 1.89 48 8  
4 3/4 0.61 15.5 1.915 48.7 J   9
5 0.618 15.7 1.941 49.3 J 1/2 9  
5 1/4 0.626 15.9 1.966 49.9 K   10
5 1/2 0.634 16.1 1.991 50.6 K 1/2 10  
5 3/4 0.642 16.3 2.016 51.2 L   11.75
6 0.65 16.5 2.041 51.8 L 1/2 11 12.75
6 1/4 0.658 16.7 2.066 52.5 12  
6 1/2 0.666 16.9 2.091 53.1 M 1/2 13 14
6 3/4 0.674 17.1 2.116 53.8 N    
7 0.682 17.3 2.141 54.4 N 1/2 14 15.25
7 1/4 0.69 17.5 2.167 55    
7 1/2 0.698 17.7 2.192 55.7 O 1/2 15 16.5
7 3/4 0.706 17.9 2.217 56.3    
8 0.714 18.1 2.242 56.9 P 1/2 16 17.75
8 1/4 0.722 18.3 2.267 57.6    
8 1/2 0.73 18.5 2.292 58.2 Q 1/2 17  
8 3/4 0.738 18.7 2.317 58.9 R   19
9 0.746 18.9 2.342 59.5 R 1/2 18  
9 1/4 0.754 19.2 2.368 60.1 S   20.25
9 1/2 0.762 19.4 2.393 60.8 S 1/2 19  
9 3/4 0.77 19.6 2.418 61.4 T   21.5
10 0.778 19.8 2.443 62.1 T 1/2 20  
10 1/4 0.786 20 2.468 62.7 U 21  
10 1/2 0.794 20.2 2.493 63.3 U 1/2 22 22.75
10 3/4 0.802 20.4 2.518 64 V    
11 0.81 20.6 2.543 64.6 V 1/2 23  
11 1/4 0.818 20.8 2.569 65.2 W   25
11 1/2 0.826 21 2.594 65.9 W 1/2 24  
11 3/4 0.834 21.2 2.619 66.5 X    
12 0.842 21.4 2.644 67.2 X 1/2 25 27.5
12 1/4 0.85 21.6 2.669 67.8    
12 1/2 0.858 21.8 2.694 68.4 Z 26 28.75
12 3/4 0.866 22 2.719 69.1 Z 1/2    
13 0.874 22.2 2.744 69.7   27  
13 1/4 0.882 22.4 2.769 70.3 Z1    
13 1/2 0.89 22.6 2.795 71      
13 3/4 0.898 22.8 2.82 71.6 Z2    
14 0.906 23 2.845 72.3 Z3    
14 1/4 0.914 23.2 2.87 72.9      
14 1/2 0.922 23.4 2.895 73.5 Z4    
14 3/4 0.93 23.6 2.92 74.2      
15 0.938 23.8 2.945 74.8      
15 1/4 0.946 24 2.97 75.4      
15 1/2 0.954 24.2 2.996 76.1      
15 3/4 0.962 24.4 3.021 76.7      
16 0.97 24.6 3.046 77.4      

* Our engineers told us to let you know NFC Ring sizes are subject to a tolerance of +/- 0.2mm.
In normal language, this means that due to the polishing process, NFC Ring you receive could be exactly as the quoted size, or around 2 average human hairs larger or smaller. Which is a tiny possible variance, but we thought we should let you know.

Suggested NFC Ring Size



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