Ring Size Conversion Chart

Inside Inside Inside Inside

China



Diameter Diameter Circumference Circumference USA British Japanese Hong Kong Swiss German French
(inches) (mm) (inches) (mm) Canada Australian Singapore



0.49 12.4 1.539 39.1 1 B 1



0.498 12.6 1.564 39.7 1 1/4 B 1/2




0.506 12.9 1.589 40.4 1 1/2 C




0.514 13.1 1.614 41 1 3/4 C 1/2




0.522 13.3 1.639 41.6 2 D 2



0.53 13.5 1.664 42.3 2 1/4 D 1/2




0.538 13.7 1.689 42.9 2 1/2 E 3



0.546 13.9 1.714 43.5 2 3/4 E 1/2




0.554 14.1 1.74 44.2 3 F 4 6 4 14 44
0.562 14.3 1.765 44.8 3 1/4 F 1/2 5
5.25

0.57 14.5 1.79 45.5 3 1/2 G
8
14.5 45
0.578 14.7 1.815 46.1 3 3/4 G 1/2 6
6.5

0.586 14.9 1.84 46.7 4 7 8.5
15 47
0.594 15.1 1.865 47.4 4 1/4 H 1/2

7.75

0.602 15.3 1.89 48 4 1/2 8 9.5
15.5 48
0.61 15.5 1.915 48.7 4 3/4 J

9

0.618 15.7 1.941 49.3 5 J 1/2 9 10.5
15.8 50
0.626 15.9 1.966 49.9 5 1/4 K

10

0.634 16.1 1.991 50.6 5 1/2 K 1/2 10 11.5
16 52
0.642 16.3 2.016 51.2 5 3/4 L

11.75

0.65 16.5 2.041 51.8 6 L 1/2 11 13.5 12.75 16.5 53
0.658 16.7 2.066 52.5 6 1/4 12



0.666 16.9 2.091 53.1 6 1/2 M 1/2 13 14.5 14 17 54
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 15.5 15.25 17.3 55
0.69 17.5 2.167 55 7 1/4




0.698 17.7 2.192 55.7 7 1/2 O 1/2 15 16.5 16.5 17.8 57
0.706 17.9 2.217 56.3 7 3/4




0.714 18.1 2.242 56.9 8 P 1/2 16 17.5 17.75 18 58
0.722 18.3 2.267 57.6 8 1/4




0.73 18.5 2.292 58.2 8 1/2 Q 1/2 17 18
18.5 59
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 19
19 60
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 20
19.5 61
0.77 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 21
20.3 62
0.786 20 2.468 62.7 10 1/4 U 21



0.794 20.2 2.493 63.3 10 1/2 U 1/2 22 23 22.75 20.8 63
0.802 20.4 2.518 64 10 3/4 V




0.81 20.6 2.543 64.6 11 V 1/2 23 24
21 64
0.818 20.8 2.569 65.2 11 1/4 W

25

0.826 21 2.594 65.9 11 1/2 W 1/2 24 25
21.3 66
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 26 27.5 21.8 67
0.85 21.6 2.669 67.8 12 1/4




0.858 21.8 2.694 68.4 12 1/2 Z 26 27 28.75 22 69
0.866 22 2.719 69.1 12 3/4 Z 1/2




0.874 22.2 2.744 69.7 13
27 28


0.882 22.4 2.769 70.3 13 1/4 Z1




0.89 22.6 2.795 71 13 1/2





0.898 22.8 2.82 71.6 13 3/4 Z2




0.906 23 2.845 72.3 14 Z3




0.914 23.2 2.87 72.9 14 1/4





0.922 23.4 2.895 73.5 14 1/2 Z4




0.93 23.6 2.92 74.2 14 3/4





0.938 23.8 2.945 74.8 15





0.946 24 2.97 75.4 15 1/4





0.954 24.2 2.996 76.1 15 1/2





0.962 24.4 3.021 76.7 15 3/4





0.97 24.6 3.046 77.4 16






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