Age

US

EU

AU

UK

Inner sole (inches)

1.5

4

20

5

5

5.36

2

4.5

21

6

6

5.62

2 - 3

5

22

7

7

5.90

2 - 3

6

23

8

8

6.15

3

7

24

9

9

6.41

3.5

8

25

10

10

6.67

4

9

26

10.5

10.5

6.94

4.5

10

27

11

11

7.16

5

11

28

12

12

7.48

5.5

12

29

13

13

7.79

6 - 7

13

30

1

1

8.14