International Ring Size Conversion Chart

12.37. 0.487. 38.86. 1.53. B. 1. -. -. 1. -. 12.6. 0.496. 39.58. 1.56. B 1/2. 1 1/4 ... 0.622. 49.64. 1.95. K. 5 1/8. 50. -. -. 10. 15.9. 0.626. 49.95. 1.97. K 1/4. 5 1/4.
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International Ring Size Conversion Chart Inside Diameter

Inside Circumference

MM

Inches

MM

Inches

9.91 10.72 11.53 11.95 12.18 12.37 12.6 12.78 13 13.21 13.41 13.61 13.83 14.05 14.15 14.25 14.36 14.45 14.56 14.65 14.86 15.04 15.27 15.4 15.53 15.7 15.8 15.9 16 16.1 16.3 16.41 16.51 16.71 16.92 17.13 17.35 17.45 17.75 17.97 18.19 18.35 18.53

0.39 0.442 0.454 0.474 0.482 0.487 0.496 0.503 0.512 0.52 0.528 0.536 0.544 0.553 0.557 0.561 0.565 0.569 0.573 0.577 0.585 0.592 0.601 0.606 0.611 0.618 0.622 0.626 0.63 0.634 0.642 0.646 0.65 0.658 0.666 0.674 0.683 0.687 0.699 0.707 0.716 0.722 0.729

31.13 33.68 36.22 37.54 38.26 38.86 39.58 40.15 40.84 41.5 42.13 42.76 43.45 44.14 44.45 44.77 45.11 45.4 45.74 46.02 46.68 47.25 47.97 48.38 48.79 49.32 49.64 49.95 50.27 50.58 51.21 51.55 51.87 52.5 53.16 53.82 54.51 54.82 55.76 56.45 57.15 57.65 58.21

1.22 1.39 1.43 1.49 1.51 1.53 1.56 1.58 1.61 1.63 1.66 1.68 1.71 1.74 1.75 1.76 1.77 1.79 1.8 1.81 1.84 1.86 1.89 1.9 1.92 1.94 1.95 1.97 1.98 1.99 2.02 2.03 2.04 2.07 2.09 2.12 2.15 2.16 2.2 2.22 2.25 2.27 2.29

Sizes British & Australia n A A 1/2 B B 1/2 C C 1/2 D D 1/2 E E 1/2 F F 1/2 F 3/4 G G 1/4 G 1/2 H H 1/2 I I 1/2 J J 1/4 J 1/2 K K 1/4 K 1/2 L L 1/4 L 1/2 M M 1/2 N N 1/2 O O 1/2 P P 1/2 Q Q 1/2 Q 3/4

US & Canada

French & Russian

0 0 0 01-Feb 03-Apr 1 1 1/4 1 1/2 1 3/4 2 2 1/4 2 1/2 2 3/4 3 3 1/8 3 1/4 3 3/8 3 1/2 3 5/8 3 3/4 4 4 1/4 4 1/2 4 5/8 4 3/4 5 5 1/8 5 1/4 5 3/8 5 1/2 5 3/4 5 7/8 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/4 8 1/2

41 1/2 42 3/4 44 45 1/4 46 1/2 47 3/4 49 50 51 3/4 52 3/4 54 55 1/4 56 1/2 57 3/4 -

German Japanese

13 1/2 13 3/4 14 14 1/2 15 15 1/4 15 1/2 15 3/4 16 16 1/2 17 17 1/4 17 3/4 18 18 1/2

1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17

Swiss

1 1/2 2 3/4 4 5 1/4 6 1/2 7 3/4 9 10 11 3/4 12 3/4 14 15 1/4 16 1/2 17 3/4 -

18.61 18.69 18.8 18.89 19.1 19.22 19.31 19.41 19.51 19.62 19.84 20.02 20.2 20.32 20.44 20.68 20.76 20.85 20.94 21.08 21.18 21.24 21.3 21.49 21.69 21.89 22.1 22.33 22.6 22.69 22.92 23.06 23.24 23.47 23.55 23.87 24.27

0.733 0.736 0.74 0.748 0.752 0.757 0.76 0.764 0.768 0.772 0.781 0.788 0.797 0.8 0.805 0.814 0.817 0.821 0.824 0.83 0.834 0.836 0.839 0.846 0.854 0.862 0.87 0.879 0.89 0.893 0.902 0.908 0.915 0.924 0.927 0.94 0.956

58.47 58.72 59.06 59.34 60 60.38 60.66 60.98 61.29 61.64 62.33 62.89 63.46 63.84 64.21 64.97 65.22 65.5 65.78 66.22 66.54 66.73 66.92 67.51 68.14 68.77 69.43 70.15 71 71.28 72 72.45 73.01 73.73 73.98 74.99 76.25

2.3 2.31 2.32 2.35 2.36 2.38 2.39 2.4 2.41 2.43 2.45 2.48 2.5 2.51 2.53 2.56 2.57 2.58 2.59 2.61 2.62 2.63 2.64 2.66 2.68 2.71 2.73 2.76 2.8 2.81 2.83 2.85 2.87 2.9 2.91 2.95 3

R R 1/4 R 1/2 R 3/4 S S 1/4 S 1/2 S 3/4 T T 1/4 T 1/2 U U 1/2 V V 1/4 V 1/2 W W 1/4 W 1/2 W 3/4 X X 1/4 X 1/2 Y Y 1/2 Z Z +1/2 Z+1 Z+1.5 Z+2 Z+2.5 Z+3 Z+3.5 Z+4 Z+4.5 Z+5 Z+6

8 5/8 8 3/4 8 7/8 9 9 1/8 9 1/4 9 3/8 9 1/2 9 5/8 9 3/4 10 10 1/4 10 1/2 10 5/8 10 3/4 11 11 1/8 11 1/4 11 3/8 11 1/2 11 5/8 11 3/4 11 7/8 12 12 1/4 12 1/2 12 3/4 13 13.5 -

59 60 1/4 61 1/2 62 3/4 63 65 66 1/4 67 1/2 68 3/4 -

19 19 1/2 20 20 1/4 20 3/4 21 21 1/4 21 3/4 22 -

18 19 20 21 22 23 24 25 26 27 -

19 20 1/4 21 1/2 22 3/4 23 3/4 25 26 1/4 27 1/2 28 3/4 -