👟 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.
A Clarks 8.5 works out to a On 9 — about half a size up. The chart below has every size.
Clarks → On: size up half a size
A Clarks 8.5 is a On 9.
Find your Clarks size on the left, read across for On:
| Clarks size | On size | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 6 | 6.5 | 5.5 | 37 | 23.5 |
| 6.5 | 7 | 6 | 38 | 24.3 |
| 7 | 7.5 | 6.5 | 38.5 | 24.7 |
| 7.5 | 8 | 7 | 39.5 | 25.1 |
| 8 | 8.5 | 7.5 | 41 | 25.9 |
| 8.5 | 9 | 8 | 41.5 | 26.3 |
| 9 | 9.5 | 8.5 | 42.5 | 26.7 |
| 9.5 | 10 | 9 | 43 | 27.1 |
| 10 | 10.5 | 9.5 | 43.5 | 27.5 |
| 10.5 | 11 | 10 | 44 | 27.9 |
| 11 | 11.5 | 10.5 | 44.5 | 28.3 |
| 11.5 | 12 | 11 | 45.5 | 28.7 |
| 12 | 12.5 | 11.5 | 46 | 29.1 |
| 12.5 | 13 | 12 | 47 | 29.5 |
| 13 | 13.5 | 12.5 | 47.5 | 29.9 |
| 13.5 | 14 | 13 | 48 | 30.3 |
| 14 | 14.5 | 13.5 | 49 | 31.1 |
| 14.5 | 15 | 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 8.5 in On?
A Clarks 8.5 is about a On 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do Clarks and On fit the same?
No — Clarks runs large and On runs true to size, so size up half a size when you switch.
ⓘ Affiliate links below. As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
Recommended on Amazon
Foot Measuring Device
Measure once, buy any brand with confidence.
View on Amazon →