Circum-
ference (mm)

Alphabetical
(Australia / NZ, UK & EU)

Numerical
(USA, Canada, Asia)

44.2 F 3
44.8 F ½
45.5 G 3 ½
46.1
46.8 H 4
47.4
48.0 I 4 ½
48.7 J
49.3 5
50.0 K
50.6 5 ½
51.2 L
51.9 6
52.5 M
53.1 6 ½
53.8 N
54.4 7
55.1 O
55.7 7 ½
56.3 P
57.0 8
57.2 /
57.6 Q
58.3 8 ½
58.9 R
59.5 9
60.2 S
60.8 9 ½
61.4 T
62.1 10
62.7 U
63.4 10 ½
64.0 V
64.6 11
65.3 W
65.9 11 ½
66.6 X
67.2 12
67.8 Y
68.5 Z 12 ½
69.1
69.7 / 13
70.4 Z+1
71 / 13 ½