US UK EU
2.5 2 34
3 2.5 35
3.5 3 35.5
4 3.5 36
4.5 4 36 2/3
5 4.5 37 2/3
5.5 5 38
6 5.5 38 2/3
6.5 6 39 1/3
7 6.5 40
7.5 7 40 2/3
8 7.5 41 1/3
8.5 8 42
9 8.5 42 2/3
9.5 9 43 1/3
10 9.5 44
10.5 10 44 2/3
11 10.5 45 1/3
11.5 11 46
12 11.5 46 2/3
12.5 12 47 1/3
13 12.5 48
13.5 13 48 2/3
14 13.5 49 1/3
14.5 14 50
15 14.5 50 2/3
16 15 51 1/3
17 16 52 2/3
18 17 53 1/3
19 18 54 2/3
20 19 55 2/3