Size chart: NIKE

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