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On to Merrell Shoe Size Conversion
Switching from On to Merrell? On runs true to size and Merrell runs true to size, so the size you order changes. Here's the full chart.
Because On and Merrell share the same fit tendency, your size carries straight across: a On 9 is a Merrell 9.
On and Merrell run the same
Order the same number — a On 9 is a Merrell 9.
Find your On size on the left, read across for Merrell:
| On size | Merrell size | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 6.5 | 6.5 | 5.5 | 37 | 23.5 |
| 7 | 7 | 6 | 38 | 24.3 |
| 7.5 | 7.5 | 6.5 | 38.5 | 24.7 |
| 8 | 8 | 7 | 39.5 | 25.1 |
| 8.5 | 8.5 | 7.5 | 41 | 25.9 |
| 9 | 9 | 8 | 41.5 | 26.3 |
| 9.5 | 9.5 | 8.5 | 42.5 | 26.7 |
| 10 | 10 | 9 | 43 | 27.1 |
| 10.5 | 10.5 | 9.5 | 43.5 | 27.5 |
| 11 | 11 | 10 | 44 | 27.9 |
| 11.5 | 11.5 | 10.5 | 44.5 | 28.3 |
| 12 | 12 | 11 | 45.5 | 28.7 |
| 12.5 | 12.5 | 11.5 | 46 | 29.1 |
| 13 | 13 | 12 | 47 | 29.5 |
| 13.5 | 13.5 | 12.5 | 47.5 | 29.9 |
| 14 | 14 | 13 | 48 | 30.3 |
| 14.5 | 14.5 | 13.5 | 49 | 31.1 |
| 15 | 15 | 14 | 49.5 | 31.5 |
⚠️ Fit varies by model. On (On Running) runs true to size for most, with a snug, performance fit. Merrell runs true to size with a roomy toe box; wide options exist.
Merrell to On → · On chart · Merrell chart · Brand finder
What is a On 9 in Merrell?
A On 9 is about a Merrell 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do On and Merrell fit the same?
Roughly, yes — both run true to size, so the same number fits.
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