Little Kids Original
(Measurements are in CM)
| 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 |
Little Kids
Hunter Boots Australia uses UK sizing
| Age Range | UK Size | US Size | EU Size |
| 12-18 mo | K4 | 5c | 21 |
| 18 - 24 mo | K5 | 6c | 22 |
| 24 mo | K6 | 7c | 23 |
| 2 - 2 ½ yr | K7 | 8c | 24 |
| 3 yr | K8 | 9c | 25 |
| 3 ½ yr | K9 | 10c | 26/27 |
| 4 - 5 yr | K10 | 11c | 28 |
| 5 - 6 yr | K11 | 12c | 29 |