Ring size conversion chart

Measurements Sizes
Inside circumference, mm Inside diameter, mm US/Canada British, Irish, Australian German, Russian Japanize Swiss Euro
44.2 14.1 3 F 14 4 4 44
44.8 14.3 3 1/4 F 1/2 5 5.25 45
45.5 14.5 3 1/2 G 14.3
46.1 14.7 3 3/4 G 1/2 6 6.5
46.7 14.9 4 H 15 7 46
47.4 15.1 4 1/4 H 1/2 7.75
48 15.3 4 1/2 I 15.3 8 47
48.7 15.5 4 3/4 J 9 48
49.3 15.7 5 J 1/2 15.6 9 49
49.9 15.9 5 1/4 K 10 50
50.6 16.1 5 1/2 K 1/2 15.9 10
51.2 16.3 5 3/4 L 11.75 51
51.8 16.5 6 L 1/2 16.6 11 12.75
52.5 16.7 6 1/4 M 12 52
53.1 16.9 6 1/2 M 1/2 16.9 13 14
53.8 17.1 6 3/4 N 53
54.4 17.3 7 N 1/2 17.5 14 15.25 54
55 17.5 7 1/4 O 55
55.7 17.7 7 1/2 O 1/2 17.8 15 16.5
56.3 17.9 7 3/4 P 56
56.9 18.1 8 P 1/2 18.1 16 17.75
57.6 18.3 8 1/4 Q 57
58.2 18.5 8 1/2 Q 1/2 18.5 17 58
58.9 18.7 8 3/4 R 19 59
59.5 18.9 9 R 1/2 18.8 18
60.1 19.1 9 1/4 S 20.25
60.8 19.3 9 1/2 S 1/2 19.4 19
61.4 19.5 9 3/4 T 21.5 61
62.1 19.7 10 T 1/2 19.7 20 62
62.7 20.1 10 1/4 U 21 63
63.3 20.3 10 1/2 U 1/2 20.1 22 22.75
64 20.5 10 3/4 V 64
64.6 20.7 11 V 1/2 20.7 23
65.2 20.9 11 1/4 W 25 65
65.9 21.1 11 1/2 W 1/2 21 24 66
66.5 21.3 11 3/4 X 67
67.2 21.5 12 X 1/2 21.3 25 27.5
67.8 21.7 12 1/4 Y 68
68.4 21.9 12 1/2 Z 21.6 26 28.75
69.1 22.1 12 3/4 Z 1/2 69
69.7 22.3 13 Z 3/4 22.3 27
22.6 13 1/2 22 1/2
23 14 23
23.4 14 1/2 23 1/2
23.8 15 23 3/4
24.2 15 1/2 24 1/4
24.6 16 24 1/2