👟 Brand to Brand
On to Clarks Shoe Size Conversion
Switching from On to Clarks? On runs true to size and Clarks runs large, so the size you order changes. Here's the full chart.
On runs 0.5 size larger than Clarks, so you may need to size down when switching.
Size up 0.5 moving to Clarks
Clarks runs smaller — order half a size larger than your On size.
Find your On size on the left, read across for Clarks:
| On size | Clarks size | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 6.5 | 6 | 5.5 | 37 | 23.5 |
| 6.5 | 6 | 5.5 | 37.5 | 23.9 |
| 7 | 6.5 | 6 | 38 | 24.3 |
| 7.5 | 7 | 6.5 | 38.5 | 24.7 |
| 8 | 7.5 | 7 | 39.5 | 25.1 |
| 8 | 7.5 | 7 | 40 | 25.5 |
| 8.5 | 8 | 7.5 | 41 | 25.9 |
| 9 | 8.5 | 8 | 41.5 | 26.3 |
| 9.5 | 9 | 8.5 | 42.5 | 26.7 |
| 10 | 9.5 | 9 | 43 | 27.1 |
| 10.5 | 10 | 9.5 | 43.5 | 27.5 |
| 11 | 10.5 | 10 | 44 | 27.9 |
| 11.5 | 11 | 10.5 | 44.5 | 28.3 |
| 12 | 11.5 | 11 | 45.5 | 28.7 |
| 12.5 | 12 | 11.5 | 46 | 29.1 |
| 13 | 12.5 | 12 | 47 | 29.5 |
| 13.5 | 13 | 12.5 | 47.5 | 29.9 |
| 14 | 13.5 | 13 | 48 | 30.3 |
| 14 | 13.5 | 13 | 48.5 | 30.7 |
| 14.5 | 14 | 13.5 | 49 | 31.1 |
| 15 | 14.5 | 14 | 49.5 | 31.5 |
⚠️ Fit varies by model. On (On Running) runs true to size for most, with a snug, performance fit. Clarks runs about half a size large for many styles; wide fittings are available.
Clarks to On → · On chart · Clarks chart · Brand finder
What is a On 10.5 in Clarks?
A On 10.5 is about a Clarks 10 — they share a foot length of roughly 27.5 cm (UK 9.5, EU 43.5).
Do On and Clarks fit the same?
Not quite — Clarks runs about 0.5 size smaller than On.
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