United Kingdom, Australia, New Zealand Europe (Italy, Spain, The Netherlands) North America
F 4.25 3
4.75 3 ¼
G 5.5 3 ½
6 ¾
H 6.75 4
7.5 4 ¼
I 8 4 ½
8 4 ½
J 8.75 4 ¾
9.25 5
K 10 5 ¼
10.5 5 ½
L 11.25 5 ¾
11.75 6
M 12.5 6 ¼
13.25 6 ½
N 13.75 6 ¾
14.5 7
O 15 7 ¼
15.75 7 ½
P 16.25 7 ¾
17 8
Q 17.5 8 ¼
18.25 8 ½
R 19 8 ¾
19.5 9
S 20.25 9 ¼
20.75 9 ½
T 21.5 9 ¾
22 10
U 22.75 10 ¼
23.25 10 ½
V 24 10 ¾
24.75 11
W 25.25 11 ¼
26 11 ½
X 26.5 11 ¾
27.25 12
Y 27.75 12 ¼
Z 28.5 12 ½