UK SIZE EU SIZE USA SIZE FOOT LENGTH Child 12 - 3 30 - 35 12.5 - 3.5 18 - 21.5 cm Youth 3 - 6 36 -40 4 - 6.5 22 - 24.5 cm Adult 7 - 12 41 - 47 7.5 - 12.5 25.5 - 29.5 cm Adult 12 - 14 47 -50 12.5 - 15 30.5 - 34 cm