Ring Sizing Chart
Inside diameter Inside circumference Sizes
(in) (mm) (in) (mm)
ISO<
Cont.
EU		 U.S.
Can.
Mex

U.K.,
Irl,
Autr,
S. Afr.
N. Z.

 East Asia ,
S. America		 India Italy
Spain,
Nether.,
Switz.
0.458 11.63 1.44 36.5 0        
0.466 11.84 1.46 37.2 1/4        
0.474 12.04 1.49 37.8 1/2 A      
0.482 12.24 1.51 38.5 3/4 A+1⁄2      
0.49 12.45 1.54 39.1 1 B 1    
0.498 12.65 1.56 39.7 1+1⁄4 B+1⁄2      
0.506 12.85 1.59 40.4 1+1⁄2 C     0.4
0.514 13.06 1.61 41.0 1+3⁄4 C+1⁄2   1 1
0.522 13.26 1.64 41.7 2 D 2 2 1.7
0.53 13.46 1.67 42.3 2+1⁄4 D+1⁄2     2.3
0.538 13.67 1.69 42.9 2+1⁄2 E 3 3 2.9
0.546 13.87 1.72 43.6 2+3⁄4 E+1⁄2   4 3.6
0.554 14.07 1.74 44.2 3 F 4   4.2
0.562 14.27 1.77 44.8 3+1⁄4 F+1⁄2 5 5 4.8
0.57 14.48 1.79 45.5 3+1⁄2 G     5.5
0.578 14.68 1.82 46.1 3+3⁄4 G+1⁄2 6 6 6.1
0.586 14.88 1.84 46.8 4 H 7   6.8
0.594 15.09 1.87 47.4 4+1⁄4 H+1⁄2   7 7.4
0.602 15.29 1.89 48.0 4+1⁄2 I 8 8 8
0.61 15.49 1.92 48.7 4+3⁄4 J   9 8.7
0.618 15.70 1.94 49.3 5 J+1⁄2 9   9.3
0.626 15.90 1.97 50.0 5+1⁄4 K   10 10
0.634 16.10 1.99 50.6 5+1⁄2 K+1⁄2 10   10.6
0.642 16.31 2.02 51.2 5+3⁄4 L   11 11.2
0.65 16.51 2.04 51.9 6 L+1⁄2 11 12 11.9
0.658 16.71 2.07 52.5 6+1⁄4 M 12   12.5
0.666 16.92 2.09 53.1 6+1⁄2 M+1⁄2 13 13 13.1
0.674 17.12 2.12 53.8 6+3⁄4 N     13.8
0.682 17.32 2.14 54.4 7 N+1⁄2 14 14 14.4
0.69 17.53 2.17 55.1 7+1⁄4 O   15 15.1
0.698 17.73 2.19 55.7 7+1⁄2 O+1⁄2 15   15.7
0.706 17.93 2.22 56.3 7+3⁄4 P   16 16.3
0.714 18.14 2.24 57.0 8 P+1⁄2 16 17 17
0.722 18.34 2.27 57.6 8+1⁄4 P+3⁄4     17.6
0.73 18.54 2.29 58.3 8+1⁄2 Q+1⁄4 17 18 18.3
0.738 18.75 2.32 58.9 8+3⁄4 R   19 18.9
0.746 18.95 2.34 59.5 9 R+1⁄2 18   19.5
0.754 19.15 2.37 60.2 9+1⁄4 S   20 20.2
0.762 19.35 2.39 60.8 9+1⁄2 S+1⁄2 19 21 20.8
0.77 19.56 2.42 61.4 9+3⁄4 T     21.4
0.778 19.76 2.44 62.1 10 T+1⁄2 20 22 22.1
0.786 19.96 2.47 62.7 10+1⁄4 U 21 23 22.7
0.794 20.17 2.49 63.4 10+1⁄2 U+1⁄2 22   23.4
0.802 20.37 2.52 64.0 10+3⁄4 V   24 24
0.81 20.57 2.54 64.6 11 V+1⁄2 23 25 24.6
0.818 20.78 2.57 65.3 11+1⁄4 W     25.3
0.826 20.98 2.59 65.9 11+1⁄2 W+1⁄2 24 26 25.9
0.834 21.18 2.62 66.6 11+3⁄4 X     26.6
0.842 21.39 2.65 67.2 12 X+1⁄2 25 27 27.2
0.85 21.59 2.67 67.8 12+1⁄4 Y   28 27.8
0.858 21.79 2.70 68.5 12+1⁄2 Y+1⁄2 26   28.5
0.866 22.00 2.72 69.1 12+3⁄4 Z   29 29.1
0.874 22.20 2.75 69.7 13 Z+1⁄2 27 30 29.7
0.882 22.40 2.77 70.4 13+1⁄4 Z1     30.4
0.89 22.61 2.80 71.0 13+1⁄2     31 31
0.898 22.81 2.82 71.7 13+3⁄4 Z2   32 31.7
0.906 23.01 2.85 72.3 14 Z3     32.3
0.914 23.22 2.87 72.9 14+1⁄4     33 32.9
0.922 23.42 2.90 73.6 14+1⁄2 Z4     33.6
0.93 23.62 2.92 74.2 14+3⁄4     34 34.2
0.938 23.83 2.95 74.8 15     35 34.8
0.946 24.03 2.97 75.5 15+1⁄4       35.5
0.954 24.23 3.00 76.1 15+1⁄2     36 36.1
0.962 24.43 3.02 76.8 15+3⁄4       36.8
0.97 24.64 3.05 77.4 16     37 37.4