True to your everyday ballet flat fit size.

Inches  Centimeters
6
 8 7/8 22.5
6.5
 9 23
7
 9 1/4 23.5
7.5
 9 3/8 23.8
8 9 1/2 24.1
8.5 9 5/8 24.6
9 9 7/8 25.1
9.5 10 25.4
10 10 1/8 25.9
10.5 10 3/8 26.2
11 10 1/2 26.7