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