Size / Ugg Kid's
Toddlers: 2-5 years
| US | UK | EU | JAPAN (CM) |
| 01/-XS | 0.5 | 16 | 8.5 |
| 2/3-S | 2 | 18 | 11 |
| 4/5-M | 4 | 20.5 | 12.5 |
Toddlers: 2-5 years
| US | UK | EU | JAPAN (CM) |
| 6 | 5 | 22 | 13 |
| 7 | 6 | 23.5 | 14.5 |
| 8 | 7 | 25 | 15 |
| 9 | 8 | 26 | 16 |
| 10 | 9 | 27.5 | 17 |
| 11 | 10 | 28.5 | 18 |
| 12 | 11 | 30 | 19 |
Kids: 5-12 years
| US | UK | EU | JAPAN (CM) |
| 13 | 12 | 31 | 20 |
| 1 | 13 | 32.5 | 21 |
| 2 | 1 | 33.5 | 22 |
| 3 | 2 | 35 | 23 |
| 4 | 3 | 36 | 24 |
| 5 | 4 | 37 | 25 |
| 6 | 5 | 38 | 26 |