If you're unsure of sizing, please refer to our guides below;
US Mens
| US Men | US Women | UK | EU |
| 4 | 5.5 | 3 | 36 |
| 4.5 | 6 | 3.5 | 36.5 |
| 5 | 6.5 | 4 | 37.5 |
| 5.5 | 7 | 4.5 | 38 |
| 6 | 7.5 | 5 | 38.5 |
| 6.5 | 8 | 5.5 | 39 |
| 7 | 8.5 | 6 | 40 |
| 7.5 | 9 | 6.5 | 40.5 |
| 8 | 9.5 | 7 | 41 |
| 8.5 | 10 | 7.5 | 42 |
| 9 | 10.5 | 8 | 42.5 |
| 9.5 | 11 | 8.5 | 43 |
| 10 | 11.5 | 9 | 44 |
| 10.5 | 12 | 9.5 | 44.5 |
| 11 | 12.5 | 10 | 45 |
| 11.5 | 13 | 10.5 | 45.5 |
| 12 | 13.5 | 11 | 46 |
| 12.5 | 14 | 11.5 | 47 |
| 13 | 14.5 | 12 | 47.5 |
| 13.5 | 15 | 12.5 | 48 |
| 14 | 15.5 | 13 | 48.5 |
| 15 | 16.5 | 14 | 49 |
US Womens
| US Women | US Men | UK | EU |
| 5.5 | 4 | 3 | 36 |
| 6 | 4.5 | 3.5 | 36.5 |
| 6.5 | 5 | 4 | 37.5 |
| 7 | 5.5 | 4.5 | 38 |
| 7.5 | 6 | 5 | 38.5 |
| 8 | 6.5 | 5.5 | 39 |
| 8.5 | 7 | 6 | 40 |
| 9 | 7.5 | 6.5 | 40.5 |
| 9.5 | 8 | 7 | 41 |
| 10 | 8.5 | 7.5 | 42 |
| 10.5 | 9 | 8 | 42.5 |
| 11 | 9.5 | 8.5 | 43 |
| 11.5 | 10 | 9 | 44 |
| 12 | 10.5 | 9.5 | 44.5 |
| 12.5 | 11 | 10 | 45 |
| 13 | 11.5 | 10.5 | 45.5 |
| 13.5 | 12 | 11 | 46 |
| 14 | 12.5 | 11.5 | 47 |
| 14.5 | 13 | 12 | 47.5 |
| 15 | 13.5 | 12.5 | 48 |
| 15.5 | 14 | 13 | 48.5 |
| 16.5 | 15 | 14 | 49 |
US Grade School
| US Kids | UK | CM | EU |
| 4 | 3.5 | 23 | 36 |
| 5 | 4.5 | 23.5 | 37.5 |
| 6 | 5.5 | 24 | 38.5 |
| 7 | 6 | 25 | 40 |
UK Size Chart - Mens + Womens - Adidas Global Footwear (inc some UltraBOOST, 4D, Y-3 styles)
| UK | US Men | US Women | EU |
| 3.5 | 4 | 5 | 36 |
| 4 | 4.5 | 5.5 | 36 2/3 |
| 4.5 | 5 | 6 | 37 1/3 |
| 5 | 5.5 | 6.5 | 38 |
| 5.5 | 6 | 7 | 40 |
| 6 | 6.5 | 7.5 | 39 1/3 |
| 6.5 | 7 | 8 | 40 |
| 7 | 7.5 | 8.5 | 40 2/3 |
| 7.5 | 8 | 9 | 41 1/3 |
| 8 | 8.5 | 9.5 | 42 |
| 8.5 | 9 | 10 | 42 2/3 |
| 9 | 9.5 | 10.5 | 43 1/3 |
| 9.5 | 10 | 11 | 44 |
| 10 | 10.5 | 11.5 | 44 2/3 |
| 10.5 | 11 | 12 | 45 1/3 |
| 11 | 11.5 | 12.5 | 46 |
| 11.5 | 12 | 13 | 46 2/3 |
| 12 | 12.5 | 13.5 | 47 1/3 |
| 12.5 | 13 | 14 | 48 |
| 13 | 13.5 | 14.5 | 48 2/3 |
| 13.5 | 14 | 15 | 49 1/3 |
| 14 | 14.5 | 15 | 50 |
Common Projects Footwear – EU Sizing
EU Mens
| EU | US Men | UK |
| 39 | 6 | 5 |
| 40 | 7 | 6 |
| 41 | 8 | 7 |
| 42 | 9 | 8 |
| 43 | 10 | 9 |
| 44 | 11 | 10 |
| 45 | 12 | 11 |
EU Womens
| EU | US Women | UK |
| 34 | 3.5 | 1 |
| 35 | 4.5 | 2 |
| 36 | 5.5 | 3 |
| 37 | 6.5 | 4 |
| 38 | 7.5 | 5 |
| 39 | 8.5 | 6 |
| 40 | 9.5 | 7 |
| 41 | 10.5 | 8 |
| 42 | 11.5 | 9 |
SUBTYPE Trousers
| XXS | XS | S | M | L | XL | |
| Waist | 34.5cm | 37cm | 39.5cm | 42cm | 44.5cm | 47cm |
| Out Leg | 95cm | 96cm | 97cm | 98cm | 99cm | 100cm |
| Inner Leg | 57cm | 57cm | 57cm | 57cm | 57cm | 57cm |