The lower end of the adult size range accommodates a crossover from children into adult sizing. Where a Bloch size 4 is the equivalent to approximately a UK Youth 1 (AU/US 1.5). Conversions may vary slightly between brands.
| Bloch | AU/US | UK | EU | JPN |
|---|---|---|---|---|
| 4 | 3 (Youth 1.5) | 1 | 33-34 | |
| 4.5 | 3.5 (Youth 2) | 1.5 | 34.5 | |
| 5 | 4 (Youth 2.5) | 2 | 35 | |
| 5.5 | 4.5 (Youth 3) | 2.5 | 35.5 | |
| 6 | 5 (Youth 3.5) | 3 | 36 | |
| 6.5 | 5.5 (Youth 4) | 3.5 | 36.5 | 22 |
| 7 | 6 | 4 | 37 | 22.5 |
| 7.5 | 6.5 | 4.5 | 37.5 | 23 |
| 8 | 7 | 5 | 38 | 23.5 |
| 8.5 | 7.5 | 5.5 | 38.5 | 24 |
| 9 | 8 | 6 | 39 | 24.5 |
| 9.5 | 8.5 | 6.5 | 39.5 | 25 |
| 10 | 9 | 7 | 40 | 25.5 |
| 10.5 | 9.5 | 7.5 | 40.5 | 26 |
| 11 | 10 | 8 | 41 | 26.5 |
| 11.5 | 10.5 | 8.5 | 41.5 | 27 |
| 12 | 11 | 9 | 42 |