| Clarks UK Size | Clarks EU Size | Standard EU Size | Foot Length (mm) |
| 3 | 35.5 | 36 | 221 |
| 3.5 | 36 | 36.5 | 225 |
| 4 | 37 | 37 | 229 |
| 4.5 | 37.5 | 37.5 | 233 |
| 5 | 38 | 38 | 237 |
| 5.5 | 39 | 38.5 | 241 |
| 6 | 39.5 | 39 | 246 |
| 6.5 | 40 | 40 | 250 |
| 7 | 41 | 41 | 254 |
| 7.5 | 41.5 | 41.5 | 258 |
| 8 | 42 | 42 | 263 |
| 8.5 | 42.5 | 42.5 | 267 |
| 9 | 43 | 43 | 272 |
| 9.5 | 44 | 44 | 276 |
| 10 | 44.5 | 45 | 280 |
| 10.5 | 45 | 45.5 | 285 |
| 11 | 46 | 46 | 289 |
| 12 | 47 | 47 | 298 |
| 13 | 48 | 48 | 306 |
| 14 | 49.5 | 49 | 314 |