Allbirds runs large. Runs large and sold in whole sizes only — size down to the nearest whole.
| Your US size | Allbirds US | UK | EU | CM |
|---|---|---|---|---|
| 4 | 3.5 | 3.5 | 36 | 22 cm |
| 4.5 | 4 | 4 | 36.5 | 22.5 cm |
| 5 | 4.5 | 4.5 | 37 | 23 cm |
| 5.5 | 5 | 5 | 37.5 | 23.5 cm |
| 6 | 5.5 | 5.5 | 38 | 24 cm |
| 6.5 | 6 | 6 | 38.5 | 24.5 cm |
| 7 | 6.5 | 6.5 | 39 | 25 cm |
| 7.5 | 7 | 7 | 40 | 25.5 cm |
| 8 | 7.5 | 7.5 | 40.5 | 26 cm |
| 8.5 | 8 | 8 | 41 | 26.5 cm |
| 9 | 8.5 | 8.5 | 41.5 | 27 cm |
| 9.5 | 9 | 9 | 42 | 27.5 cm |
| 10 | 9.5 | 9.5 | 42.5 | 28 cm |
| 10.5 | 10 | 10 | 43 | 28.5 cm |
| 11 | 10.5 | 10.5 | 43.5 | 29 cm |
| 11.5 | 11 | 11 | 44 | 29.5 cm |
| 12 | 11.5 | 11.5 | 44.5 | 30 cm |
| 12.5 | 12 | 12 | 45 | 30.5 cm |
| 13 | 12.5 | 12.5 | 46 | 31 cm |
| 13.5 | 13 | 13 | 46.5 | 31.5 cm |
| 14 | 13.5 | 13.5 | 47 | 32 cm |
| 14.5 | 14 | 14 | 47.5 | 32.5 cm |
| 15 | 14.5 | 14.5 | 48 | 33 cm |