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Heel to toe (IN) UK kids EU US
3.54 – – C1
3.86 2 17-18 C2
4.21 3 18-19 C3
4.53 4 19-20 C4
4.84 5 20-21 C5
5.20 6 22-23 C6
5.51 7 23-24 C7
5.87 8 24-25 C8
6.18 9 25-26 C9
6.54 10 27-28 C10
6.85 11 28-29 C11
7.20 12 29-30 C12
7.52 13 30-31 C13
7.87 1 32-33 J1
8.19 2 33-34 J2
8.54 3 34-35 J3
8.86 4 36-37 J4
9.17 5 37-38 J5
9.53 6 38-39 J6
Heel to toe (cm) UK kids EU US
9.0 – – C1
9.8 2 17-18 C2
10.7 3 18-19 C3
11.5 4 19-20 C4
12.3 5 20-21 C5
13.2 6 22-23 C6
14.0 7 23-24 C7
14.9 8 24-25 C8
15.7 9 25-26 C9
16.6 10 27-28 C10
17.4 11 28-29 C11
18.3 12 29-30 C12
19.1 13 30-31 C13
20.0 1 32-33 J1
20.8 2 33-34 J2
21.7 3 34-35 J3
22.5 4 36-37 J4
23.3 5 37-38 J5
24.2 6 38-39 J6

Between sizes? Crocs recommends sizing up.