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Merrell to On Shoe Size Conversion
Switching from Merrell to On? Merrell runs true to size and On runs true to size, so the size you order changes. Here's the full chart.
Because Merrell and On share the same fit tendency, your size carries straight across: a Merrell 9 is a On 9.
Merrell and On run the same
Order the same number — a Merrell 9 is a On 9.
Find your Merrell size on the left, read across for On:
| Merrell size | On 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. Merrell runs true to size with a roomy toe box; wide options exist. On (On Running) runs true to size for most, with a snug, performance fit.
On to Merrell → · Merrell chart · On chart · Brand finder
What is a Merrell 9 in On?
A Merrell 9 is about a On 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do Merrell and On fit the same?
Roughly, yes — both run true to size, so the same number fits.
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