Ring chart

Internal mm British (Wheatsheaf) European Sizes US Sizes
12.1 A
12.3
12.5 B 1
12.7 0
12.9 C 1
13.1
13.3 D 2
13.5 3
13.7 E 3
13.9 4
14.1 F 4 3
14.3 5
14.5 G 6
14.7 6
14.9 H 7 4
15.1 7
15.3 I 8
15.5 9
15.7 J 10 5
15.9
16.1 K 11
16.3 12
16.5 L 6
16.7 13
16.9 M 14
17.1
17.3 N 15 7
17.5
17.7 O 16
17.9 17 8
18.1 P 8
18.3 18
18.5 Q 9
18.7 19
18.9 R 20
19.1
19.3 S 21 10
19.5 22 10½
19.7 T
19.9 23 11
20.1 U 24
20.3 25
20.5 V
20.7 26 12
20.9 W
21.1 27
21.3 X
21.5 28 13
21.7 Y 29
21.9 30
22.1 Z
22.3 31 14
22.5 Z+1 32
22.9 Z+2 33
23.1 Z+2 73½
23.3 Z+3 34
23.7 Z+4 35
24.1 Z+5 37
24.5 Z+6 38

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