Heel-toe UK US EU
21.6 cm 3 3.5 35.5
22.1 cm 3.5 4 36
22.5 cm 4 4.5 36 2/3
22.9 cm 4.5 5 37 1/3
23.3 cm 5 5.5 38
23.8 cm 5.5 6 38 2/3
24.2 cm 6 6.5 39 1/3
24.6 cm 6.5 7 40
25 cm 7 7.5 40 2/3