指輪内径(mm) 内周・指まわり(mm) 日本(号) US UK
13.0 40.8 1 1 B
13.4 41.9 2 2 D
13.7 42.9 3 2 1/2 E
14.0 44.0 4 3 F
14.4 45.0 5 3 1/2 G 1/4
14.7 46.1 6 3 3/4 H
15.0 47.1 7 4 H 1/2
15.4 48.2 8 4 1/2 I 1/2
15.7 49.2 9 5 J 1/2
16.0 50.3 10 5 3/8 K 1/2
16.4 51.3 11 5 1/2 L
16.7 52.4 12 5 7/8 L 1/2
17.0 53.4 13 6 1/2 N
17.4 54.5 14 7 O
17.7 55.5 15 7 1/2 P
18.0 56.5 16 7 3/4 P 1/2
18.4 57.6 17 8 1/4 Q 1/2
18.7 58.6 18 8 3/4 R 1/4
19.0 59.7 19 9 R 3/4
19.4 60.7 20 9 1/8 S
19.7 61.8 21 9 1/2 S 3/4
20.0 62.8 22 10 1/4 U
20.4 63.9 23 10 5/8 V
20.7 64.9 24 11 V 1/2
21.0 66.0 25 11 1/2 W 3/4
21.4 67.0 26 11 7/8 X 1/2
21.7 68.0 27 12 1/4 Y 1/2
22.0 69.1 28 12 1/2 Z
22.4 70.2 29 13 Z +1