For the purpose of standardization, we use Nike's US mens size as the default.
US Men's US Women's Euro
3.5 5 35.5
4 5.5 36
4.5 6 36.5
5 6.5 37.5
5.5 7 38
6 7.5 38.5
6.5 8 39
7 8.5 40
7.5 9 40.5
8 9.5 41
8.5 10 42
9 10.5 42.5
9.5 11 43
10 11.5 44
10.5 12 44.5
11 12.5 45
11.5 13 45.5
12 13.5 46
12.5 14 47
13 14.5 47.5
14 15.5 48.5