UK EU US 
3 35.5 W 5 
3.5 36 W 6
4 36.5 W 6.5
4.5 37.5 W 7
5 38 W 7.5
5.5 38.5 W 8
6 39/40 M 7 / W 8.5
6.5 40.5 M 7.5 / W 9
7 41 M 8 / W 9.5
7.5 42 M 8.5 / W 10
8 42.5 M 9 / W 10.5
8.5 43 M 9.5 / W 11
9 44 M 10
9.5 44.5 M 10.5
10 45 M 11
10.5 45.5 M 11.5
11 46 M 12
11.5 47 M 12.5
12 47.5 M 13