👟 Brand to Brand
adidas to On Shoe Size Conversion
Switching from adidas to On? adidas runs small and On runs true to size, so the size you order changes. Here's the full chart.
A adidas 9.5 works out to a On 9 — about half a size down. The chart below has every size.
adidas → On: size down half a size
A adidas 9.5 is a On 9.
Find your adidas size on the left, read across for On:
| adidas size | On size | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 7 | 6.5 | 5.5 | 37 | 23.5 |
| 7.5 | 7 | 6 | 38 | 24.3 |
| 8 | 7.5 | 6.5 | 38.5 | 24.7 |
| 8.5 | 8 | 7 | 39.5 | 25.1 |
| 9 | 8.5 | 7.5 | 41 | 25.9 |
| 9.5 | 9 | 8 | 41.5 | 26.3 |
| 10 | 9.5 | 8.5 | 42.5 | 26.7 |
| 10.5 | 10 | 9 | 43 | 27.1 |
| 11 | 10.5 | 9.5 | 43.5 | 27.5 |
| 11.5 | 11 | 10 | 44 | 27.9 |
| 12 | 11.5 | 10.5 | 44.5 | 28.3 |
| 12.5 | 12 | 11 | 45.5 | 28.7 |
| 13 | 12.5 | 11.5 | 46 | 29.1 |
| 13.5 | 13 | 12 | 47 | 29.5 |
| 14 | 13.5 | 12.5 | 47.5 | 29.9 |
| 14.5 | 14 | 13 | 48 | 30.3 |
| 15 | 14.5 | 13.5 | 49 | 31.1 |
| 15.5 | 15 | 14 | 49.5 | 31.5 |
⚠️ Fit varies by model. adidas generally runs about half a size small, particularly lifestyle and Ultraboost models; Sambas and Gazelles run long and narrow. On (On Running) runs true to size for most, with a snug, performance fit.
On to adidas → · adidas chart · On chart · Brand finder
What is a adidas 9.5 in On?
A adidas 9.5 is about a On 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do adidas and On fit the same?
No — adidas runs small and On runs true to size, so size down half a size when you switch.
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