US Sizing EU Sizing CM Inches
3 18/19 11.43 4.5
4 20/21 12.7 5
6 22/23 13.97 5.5
7 24/25 15.24 6
9 26/27 16.51 6.5
11 28/29 17.78 7
12 30/31 19.05 7.5