👟 Brand to Brand
Clarks to On Shoe Size Conversion
Switching from Clarks to On? Clarks runs large and On runs true to size, 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 down 0.5 moving to On
On runs larger — order half a size smaller than your Clarks size.
Find your Clarks size on the left, read across for On:
| Clarks size | On size | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 6.5 | 7 | 5.5 | 37 | 23.5 |
| 6.5 | 7 | 5.5 | 37.5 | 23.9 |
| 7 | 7.5 | 6 | 38 | 24.3 |
| 7.5 | 8 | 6.5 | 38.5 | 24.7 |
| 8 | 8.5 | 7 | 39.5 | 25.1 |
| 8 | 8.5 | 7 | 40 | 25.5 |
| 8.5 | 9 | 7.5 | 41 | 25.9 |
| 9 | 9.5 | 8 | 41.5 | 26.3 |
| 9.5 | 10 | 8.5 | 42.5 | 26.7 |
| 10 | 10.5 | 9 | 43 | 27.1 |
| 10.5 | 11 | 9.5 | 43.5 | 27.5 |
| 11 | 11.5 | 10 | 44 | 27.9 |
| 11.5 | 12 | 10.5 | 44.5 | 28.3 |
| 12 | 12.5 | 11 | 45.5 | 28.7 |
| 12.5 | 13 | 11.5 | 46 | 29.1 |
| 13 | 13.5 | 12 | 47 | 29.5 |
| 13.5 | 14 | 12.5 | 47.5 | 29.9 |
| 14 | 14.5 | 13 | 48 | 30.3 |
| 14 | 14.5 | 13 | 48.5 | 30.7 |
| 14.5 | 15 | 13.5 | 49 | 31.1 |
| 15 | 15.5 | 14 | 49.5 | 31.5 |
⚠️ Fit varies by model. Clarks runs about half a size large for many styles; wide fittings are available. On (On Running) runs true to size for most, with a snug, performance fit.
On to Clarks → · Clarks chart · On chart · Brand finder
What is a Clarks 10.5 in On?
A Clarks 10.5 is about a On 11 — they share a foot length of roughly 27.5 cm (UK 9.5, EU 43.5).
Do Clarks and On fit the same?
Not quite — On runs about 0.5 size larger than Clarks.
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