| Mondo (cm) | Men / Unisex (US) | Women (US) | Europe | UK |
| 13.5 | 7C (Kids') | - | 24 | 6 |
| 14.5 | 8C (Kids') | - | 25 | 7 |
| 15.5 | 9C (Kids') | - | 26 | 8 |
| 16.5 | 10C (Kids') | - | 27 | 9 |
| 17.5 | 11C (Kids') | - | 28 | 10 |
| 18.5 | 12C (Kids') | - | 29 | 11 |
| 19.5 | 13C (Kids') | - | 30.5 | 12 |
| 20 | 1 | - | 31.5 | 13 |
| 20.5 | 2 | - | 33 | 1 |
| 21 | 3 | - | 34 | 2 |
| 22 | 4 | 5 | 35 | 3 |
| 22.5 | 4.5 | 5.5 | 36 | 3.5 |
| 23 | 5 | 6 | 36.5 | 4 |
| 23.5 | 5.5 | 6.5 | 37 | 4.5 |
| 24 | 6 | 7 | 38 | 5 |
| 24.5 | 6.5 | 7.5 | 38.5 | 5.5 |
| 25 | 7 | 8 | 39 | 6 |
| 25.5 | 7.5 | 8.5 | 40 | 6.5 |
| 26 | 8 | 9 | 40.5 | 7 |
| 26.5 | 8.5 | 9.5 | 41 | 7.5 |
| 27 | 9 | 10 | 42 | 8 |
| 27.5 | 9.5 | 10.5 | 42.5 | 8.5 |
| 28 | 10 | 11 | 43 | 9 |
| 28.5 | 10.5 | 11.5 | 44 | 9.5 |
| 29 | 11 | 12 | 44.5 | 10 |
| 29.5 | 11.5 | - | 45 | 10.5 |
| 30 | 12 | - | 45.5 | 11 |
| 30.5 | 12.5 | - | 46 | 11.5 |
| 31 | 13 | - | 47 | 12 |
| 31.5 | 13.5 | - | 47.5 | 12.5 |
| 32 | 14 | - | 48 | 13 |
| 32.5 | 13.5 | - | 48.5 | 13.5 |
| 33 | 15 | - | 49 | 14 |
| 33.5 | 15.5 | - | 50 | 14.5 |
| 34 | 16 | - | 51 | 15 |
*Boot sizes may vary slightly by manufacturer so be sure to check the sizing for individual models.