| UK Size | Insole Length | Max Calf Circumference | Topline Circumference | Boot Height |
| K4 | 13.90 | 26.20 | 24.90 | 14 |
| K5 | 14.60 | 26.90 | 25.70 | 14 |
| K6 | 15.30 | 27.60 | 26.50 | 17 |
| K7 | 16.00 | 28.30 | 27.60 | 17 |
| K8 | 16.60 | 29.00 | 28.00 | 17 |
| K9 | 17.30 | 29.70 | 29.00 | 19 |
| K10 | 18.00 | 30.40 | 29.80 | 19 |
| K11 | 19.30 | 31.80 | 31.20 | 19 |
| K12 | 20.00 | 32.50 | 31.80 | 21 |
| K13 | 20.60 | 33.20 | 32.30 | 21 |
| 1 | 21.30 | 33.90 | 33.00 | 21 |
| 2 | 22.00 | 34.60 | 34.00 | 21 |
Little Kids Hunter Boots Australia uses UK sizing
| Age Range | UK Size | US Size | EU Size |
| 12 to 18 mo | 4 | 5C | 21 |
| 18 to 24 mo | 5 | 6C | 22 |
| 24 mo | 6 | 7C | 23 |
| 2 to 2 1/2 yr | 7 | 8C | 24 |
| 3 yr | 8 | 9C | 25 |
| 3 1/2 yr | 9 | 10C | 26/27 |
| 4 to 5 yr | 10 | 11C | 28 |
| 5 to 6 yr | 11 | 12C | 29 |