Big Kids
(measurements are in CM)
| UK Size | Insole Length | Max Calf Circumference | Topline Circumference | Boot Height |
| J12 | 20.08 | 22.70 | 20.91 | 22.70 |
| J13 | 20.92 | 27.90 | 21.54 | 27.70 |
| J1 | 21.75 | 27.90 | 22.18 | 27.70 |
| J2 | 22.61 | 27.90 | 22.81 | 27.70 |
| J3 | 23.46 | 32.00 | 23.45 | 31.40 |
| J4 | / | / | / | / |
Hunter Boots Australia uses UK sizing
| Age Range | UK Size | US Size | EU Size | Insole Length |
| 6-7 yr | J12 | 13c | 31 | 20.00 |
| 8 yr | J13 | 1 | 32 | 20.70 |
| 9 yr | J1 | 2 | 33 | 21.40 |
| 10 yr | J2 | 3 | 34 | 22.10 |
| 11-12 yr | J3 | 4 | 35/36 | 22.80 |
| 13 yr | J4 | 5 | 37 | 24.20 |