| US / CA | EU | UK | Foot Length | Age Group |
|---|---|---|---|---|
| Infant 0 | 15 | 0 | 3.1 | 0-12 months |
| Infant 1 | 16 | 0.5 | 3.5 | 0-12 months |
| Infant 2 | 17 | 1 | 3.8 | 0-12 months |
| Infant 2.5 | 18 | 1.5 | 4 | 0-12 months |
| Infant 3 | 18 | 2 | 4.1 | 12-24 months |
| Infant 3.5 | 19 | 2.5 | 4.3 | 12-24 months |
| Toddler 4 | 19 | 3 | 4.5 | 12-24 months |
| Toddler 4.5 | 20 | 3.5 | 4.6 | 12-24 months |
| Toddler 5 | 20 | 4 | 4.8 | 12-24 months |
| Toddler 5.5 | 21 | 4.5 | 5 | 12-24 months |
| S (Toddler 5-6) | 20-22 | 4-5 | 4.8-5.1 | 12-24 months |
| Toddler 6 | 22 | 5 | 5.1 | 12-24 months |
| Toddler 7 | 23 | 6 | 5.5 | 2-4 years |
| M (Toddler 7-8) | 23-24 | 6-7 | 5.5-5.8 | 2-4 years |
| Toddler 8 | 24 | 7 | 5.8 | 2-4 years |
| Toddler 9 | 25 | 8 | 6.1 | 2-4 years |
| L (Toddler 9-10) | 25-27 | 8-9 | 6.1-6.5 | 2-4 years |
| Toddler 10 | 27 | 9 | 6.5 | 2-4 years |
| Little Kid 11 | 28 | 10 | 6.8 | 4-6 years |
| XL (Little Kid 11-12) | 28-30 | 10-11 | 6.8-7.1 | 4-6 years |
| Little Kid 12 | 30 | 11 | 7.1 | 4-6 years |
| Little Kid 13 | 31 | 12 | 7.5 | 4-6 years |
| Little Kid 1 | 32 | 13 | 7.8 | 4-6 years |
| Little Kid 2 | 33 | 1 | 8.1 | 6-9 years |
| Big Kid 3 | 34 | 2 | 8.5 | 6-9 years |
| XS (Toddler 3-4) | 18-19 | 3-4 | 4.1-4.6 | 6-12 months |
| XXL (Little Kid 13-1) | 31-32 | 12-13 | 7.5-7.8 | 6-9 years |
| 3XL (Little Kid 2-3) | 33-34 | 14-15 | 8.1 | 6-9 years |
| XXS (Infant 1-2) | 16-17 | 1-2 | 3.5-4 | 1-9 months |
| US / CA | EU | UK | Foot Length | Age Group |
|---|---|---|---|---|
| Infant 0 | 15 | 0 | 8 | 0-12 months |
| Infant 1 | 16 | 0.5 | 8.9 | 0-12 months |
| Infant 2 | 17 | 1 | 9.5 | 0-12 months |
| Infant 2.5 | 18 | 1.5 | 10.2 | 0-12 months |
| Infant 3 | 18 | 2 | 10.5 | 12-24 months |
| Infant 3.5 | 19 | 2.5 | 10.8 | 12-24 months |
| Toddler 4 | 19 | 3 | 11.4 | 12-24 months |
| Toddler 4.5 | 20 | 3.5 | 11.8 | 12-24 months |
| Toddler 5 | 20 | 4 | 12.1 | 12-24 months |
| Toddler 5.5 | 21 | 4.5 | 12.7 | 12-24 months |
| S (Toddler 5-6) | 20-22 | 4-5 | 12.1-13 | 12-24 months |
| Toddler 6 | 22 | 5 | 13 | 12-24 months |
| Toddler 7 | 23 | 6 | 14 | 2-4 years |
| M (Toddler 7-8) | 23-24 | 6-7 | 14-14.6 | 2-4 years |
| Toddler 8 | 24 | 7 | 14.6 | 2-4 years |
| Toddler 9 | 25 | 8 | 15.6 | 2-4 years |
| L (Toddler 9-10) | 25-27 | 8-9 | 15.6-16.5 | 2-4 years |
| Toddler 10 | 27 | 9 | 16.5 | 2-4 years |
| Little Kid 11 | 28 | 10 | 17.1 | 4-6 years |
| XL (Little Kid 11-12) | 28-30 | 10-11 | 17.1-18.1 | 4-6 years |
| Little Kid 12 | 30 | 11 | 18.1 | 4-6 years |
| Little Kid 13 | 31 | 12 | 19 | 4-6 years |
| Little Kid 1 | 32 | 13 | 19.7 | 4-6 years |
| Little Kid 2 | 33 | 1 | 20.7 | 6-9 years |
| Big Kid 3 | 34 | 2 | 21.6 | 6-9 years |
| XS (Toddler 3-4) | 18-19 | 3-4 | 10.5-11.8 | 6-12 months |
| XXL (Little Kid 13-1) | 31-32 | 12-13 | 19-19.7 | 6-9 years |
| 3XL (Little Kid 2-3) | 33-34 | 14-15 | 20.7 | 6-9 years |
| XXS (Infant 1-2) | 16-17 | 1-2 | 8.9-10.2 | 1-9 months |