International Ring Size Conversion Chart MM Inches MM Inches British & Australian US & Canada French & Russian German Japanese 13.21 0.52 41.5 1.63 D 2 41 1/2 13 1/2 2 13.61 0.536 42.76 1.68 E 2 1/2 42 3/4 13 3/4 3 14.05 0.553 44.14 1.74 F 3 44 14 4 14.45 0.569 45.4 1.79 G 1/4 3 1/2 - 14 1/2 - 14.86 0.585 46.68 1.84 H 1/2 4 - 15 7 15.27 0.601 47.97 1.89 I 1/2 4 1/2 - 15 1/4 8 15.7 0.618 49.32 1.94 J 1/2 5 - 15 3/4 9 16.1 0.634 50.58 1.99 L 5 1/2 51 3/4 16 - 16.51 0.65 51.87 2.04 M 6 52 3/4 16 1/2 12 16.92 0.666 53.16 2.09 N 6 1/2 54 17 13 17.35 0.683 54.51 2.15 O 7 55 1/4 17 1/4 14 17.75 0.699 55.76 2.2 P 7 1/2 56 1/2 17 3/4 15 18.19 0.716 57.15 2.25 Q 8 57 3/4 18 16 18.53 0.729 58.21 2.29 Q 3/4 8 1/2 - 18 1/2 17 18.89 0.748 59.34 2.35 R 3/4 9 - 19 18 19.41 0.764 60.98 2.4 S 3/4 9 1/2 - 19 1/2 19 19.84 0.781 62.33 2.45 T 1/2 10 - 20 20 20.2 0.797 63.46 2.5 U 1/2 10 1/2 - 20 1/4 22 20.68 0.814 64.97 2.56 V 1/2 11 - 20 3/4 23 21.08 0.83 66.22 2.61 W 3/4 11 1/2 - 21 24 21.49 0.846 67.51 2.66 Y 12 67 1/2 21 1/4 25 21.89 0.862 68.77 2.71 Z 12 1/2 68 3/4 21 3/4 26 22.33 0.879 70.15 2.76 Z+1 13 - 22 27 22.6 0.89 71 2.8 Z+1.5 13.5 - - - Inside Diameter Inside Circumference Sizes
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