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Ring Size Conversion Chart

Please check the chart below before ordering rings. This chart will show you the approximate differences between ring sizes and should help you get the ring that fits you best.
Ladies Ring Sizes
Inside Inside Inside Inside Number Sizes Wheat Sheaf    
Diameter Diameter Circumference Circumference US/Canada British Japanese Swiss
(inches) (mm) (inches) (mm) Standard Irish Equivalent Equivalent
       

 

 Australian    
          Equivalent    
0.618 15.7 1.941 49.3 5 J 1/2 9  
0.626 15.9 1.966 49.9 5 1/4 K   10.00
0.634 16.1 1.991 50.6 5 1/2 K 1/2 10  
0.642 16.3 2.016 51.2 5 3/4 L   11.75
0.650 16.5 2.041 51.8 6 L 1/2 11 12.75
0.658 16.7 2.066 52.5 6 1/4 M  12  
0.666 16.9 2.091 53.1 6 1/2 M 1/2 13 14.00
0.674 17.1 2.116 53.8 6 3/4 N    
0.682 17.3 2.141 54.4 7 N 1/2 14 15.25
0.690 17.5 2.167 55.0 7 1/4 O     
0.698 17.7 2.192 55.7 7 1/2 O 1/2 15 16.50
0.706 17.9 2.217 56.3 7 3/4 P     
0.714 18.1 2.242 56.9 8 P 1/2 16 17.75
0.722 18.3 2.267 57.6 8 1/4 Q     
0.730 18.5 2.292 58.2 8 1/2 Q 1/2 17  
0.738 18.7 2.317 58.9 8 3/4 R   19
0.746 18.9 2.342 59.5 9 R 1/2 18  
0.754 19.2 2.368 60.1 9 1/4 S   20.25
0.762 19.4 2.393 60.8 9 1/2 S 1/2 19  
0.770 19.6 2.418 61.4 9 3/4 T   21.5
Gents Ring Sizes
Inside Inside Inside Inside Number Sizes Wheat Sheaf    
Diameter Diameter Circumference Circumference US/Canada British Japanese Swiss
(inches) (mm) (inches) (mm) Standard Irish Equivalent Equivalent
       

 

 Australian    
          Equivalent    
0.714 18.1 2.242 56.9 8 P 1/2 16 17.75
0.722 18.3 2.267 57.6 8 1/4 Q     
0.730 18.5 2.292 58.2 8 1/2 Q 1/2 17  
0.738 18.7 2.317 58.9 8 3/4 R   19
0.746 18.9 2.342 59.5 9 R 1/2 18  
0.754 19.2 2.368 60.1 9 1/4 S   20.25
0.762 19.4 2.393 60.8 9 1/2 S 1/2 19  
0.770 19.6 2.418 61.4 9 3/4 T   21.5
0.778 19.8 2.443 62.1 10 T 1/2 20  
0.786 20.0 2.468 62.7 10 1/4 U 21  
0.794 20.2 2.493 63.3 10 1/2 U 1/2 22 22.75
0.802 20.4 2.518 64.0 10 3/4 V    
0.810 20.6 2.543 64.6 11 V 1/2 23  
0.818 20.8 2.569 65.2 11 1/4 W   25
0.826 21.0 2.594 65.9 11 1/2 W 1/2 24  
0.834 21.2 2.619 66.5 11 3/4 X    
0.842 21.4 2.644 67.2 12 X 1/2 25 27.50
0.850 21.6 2.669 67.8 12 1/4 Y     
0.858 21.8 2.694 68.4 12 1/2 Z 26 28.75
0.866 22.0 2.719 69.1 12 3/4 Z 1/2