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Gilbert's boot size conversion for junior UK sizes 12–5.5. UK 12 and 13 precede UK 1. The manufacturer does not list foot length.

UK US EU
12 13 30
13 1 31
1 2 32.5
1.5 2.5 33
2 2.5 34
2.5 3 35
3 3.5 35.5
3.5 4 36
4 4.5 37
4.5 5 37.5
5 5.5 38
5.5 6 38.5

Source: Gilbert boot size chart