Match sizes by foot length (cm), then check model fit — US labels alone can mislead across brands.
Chart match · verify brand charts(paid link)
Full converter (model + shoes you own) · Reverse: Blundstone → Clarks
Static conversion table (crawlable). Interactive tool above uses the same cm matching.
| Clarks US | cm | Blundstone US | Blundstone EU |
|---|---|---|---|
| 6.0 | 23.6 | 6.0 | 38.5 |
| 6.5 | 24.1 | 6.5 | 39.0 |
| 7.0 | 24.6 | 7.0 | 40.0 |
| 7.5 | 25.1 | 7.5 | 40.5 |
| 8.0 | 25.4 | 8.0 | 41.0 |
| 8.5 | 25.9 | 8.5 | 42.0 |
| 9.0 | 26.2 | 9.0 | 42.5 |
| 9.5 | 26.8 | 9.5 | 43.0 |
| 10.0 | 27.2 | 10.0 | 44.0 |
| 10.5 | 27.6 | 10.5 | 44.5 |
| 11.0 | 27.9 | 11.0 | 45.0 |
| 11.5 | 28.4 | 11.5 | 45.5 |
| 12.0 | 28.9 | 12.0 | 46.0 |
| 13.0 | 29.8 | 13.0 | 47.5 |
Clarks US 10 is 27.2 cm; Blundstone’s nearest US is 10 (EU 44). The ladder stays 1:1 through US 10.5 (27.6 cm). Wallabee / Desert Boot are lace chukkas; Classic 500 and Original 510 are elastic-sided boots with a different heel lock. Matching cm does not match how the boot stays on.
Blundstone sizing arguments are usually about the elastic and the instep, not about a 4 mm length miss. If a Wallabee feels long, dropping a half in Blundstone because “the chart is 1:1 so I’ll compensate” often creates toe bang on descents. Start at the Blundstone US next to 27.2 cm, then use the 500/510 guides for width and break-in.
Clarks crepe lasts and Blundstone’s TAS last are not interchangeable street sizes even when US 10 equals US 10 on paper. Convert length here; convert feel on the model pages. Do not treat this table as a Chelsea-boot size-down rule.
Even when charts match, lasts differ. Check these guides:
Clarks: Wallabee · Desert Boot
Blundstone: Classic 500 · Original 510
Check prices: Clarks Blundstone (paid link)
Clothes sizing uses a separate compare path.