This is a general size guide. Measurements and fit will differ slightly between brands and styles.

 EU / IT
AU / UK
US
CM
39 6 7 24.6
40 6.5 7.5 24.8
41 7
7.5
8
8.5
25.4
25.7
42 8 9 25.8
43 8.5
9
9.5
10
26.7
27.0
44 9.5
10
10.5
11
27.3
27.8
45 10.5
11
11.5
12
28.3
28.6
46 11.5
12
12.5
13
29.0
29.4
47 12.5
13
14 30.2
31.1