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Ring Size Chart

Ring Size Chart

Inside diameter Inside circumference Sizes
(in) (mm) (in) (mm) United States,
Canada and
Mexico
United Kingdom,
Australia and
New Zealand
South America India Italy,
Spain,
Netherlands,
Switzerland
0.458 11.63 1.44 36.5 0        
0.466 11.84 1.46 37.2 ¼        
0.474 12.04 1.49 37.8 ½ A      
0.482 12.24 1.51 38.5 ¾      
0.49 12.45 1.54 39.1 1 B 1    
0.498 12.65 1.56 39.7      
0.506 12.85 1.59 40.4 C     0.5
0.514 13.06 1.61 41   1 1
0.522 13.26 1.64 41.7 2 D 2 2 1.75
0.53 13.46 1.67 42.3     2.25
0.538 13.67 1.69 42.9 E 3 3 3
0.546 13.87 1.72 43.6   4 3.5
0.554 14.07 1.74 44.2 3 F 4   4.25
0.562 14.27 1.77 44.8 5 5 4.75
0.57 14.48 1.79 45.5 G     5.5
0.578 14.68 1.82 46.1 6 6 6
0.586 14.88 1.84 46.8 4 H 7   6.75
0.594 15.09 1.87 47.4   7 7.5
0.602 15.29 1.89 48 I 8 8 8
0.61 15.49 1.92 48.7 J   9 8.75
0.618 15.7 1.94 49.3 5 9   9.25
0.626 15.9 1.97 50 K   10 10
0.634 16.1 1.99 50.6 10   10.5
0.642 16.31 2.02 51.2 L   11 11.25
0.65 16.51 2.04 51.9 6 11 12 11.75
0.658 16.71 2.07 52.5 M 12   12.5
0.666 16.92 2.09 53.1 13 13 13.25
0.674 17.12 2.12 53.8 N     13.75
0.682 17.32 2.14 54.4 7 14 14 14.5
0.69 17.53 2.17 55.1 O   15 15
0.698 17.73 2.19 55.7 15   15.75
0.706 17.93 2.22 56.3 P   16 16.25
0.714 18.14 2.24 57 8 16 17 17
0.722 18.34 2.27 57.6 Q     17.5
0.73 18.54 2.29 58.3 17 18 18.25
0.738 18.75 2.32 58.9 R   19 19
0.746 18.95 2.34 59.5 9 18   19.5
0.754 19.15 2.37 60.2 S   20 20.25
0.762 19.35 2.39 60.8 19 21 20.75
0.77 19.56 2.42 61.4 T     21.5
0.778 19.76 2.44 62.1 10 20 22 22
0.786 19.96 2.47 62.7 10¼ U 21 23 22.75
0.794 20.17 2.49 63.4 10½ 22   23.25
0.802 20.37 2.52 64 10¾ V   24 24
0.81 20.57 2.54 64.6 11 23 25 24.75
0.818 20.78 2.57 65.3 11¼ W     25.25
0.826 20.98 2.59 65.9 11½ 24 26 26
0.834 21.18 2.62 66.6 11¾ X     26.5
0.842 21.39 2.65 67.2 12 25 27 27.25
0.85 21.59 2.67 67.8 12¼ Y   28 27.75
0.858 21.79 2.7 68.5 12½ Z 26   28.5
0.866 22 2.72 69.1 12¾   29 29
0.874 22.2 2.75 69.7 13   27 30 29.75
0.882 22.4 2.77 70.4 13¼ Z1     30.5
0.89 22.61 2.8 71 13½     31 31
0.898 22.81 2.82 71.7 13¾ Z2   32 31.75
0.906 23.01 2.85 72.3 14 Z3     32.25
0.914 23.22 2.87 72.9 14¼     33 33
0.922 23.42 2.9 73.6 14½ Z4     33.5
0.93 23.62 2.92 74.2 14¾     34 34.25
0.938 23.83 2.95 74.8 15     35 34.75
0.946 24.03 2.97 75.5 15¼       35.5
0.954 24.23 3 76.1 15½     36 36.25
0.962 24.43 3.02 76.8 15¾       36.75
0.97 24.64 3.05 77.4 16     37 37.5

Sourced from Wikipedia