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Nike to On Shoe Size Conversion
Switching from Nike to On? Nike runs small and On runs true to size, so the size you order changes. Here's the full chart.
A Nike 9.5 works out to a On 9 — about half a size down. The chart below has every size.
Nike → On: size down half a size
A Nike 9.5 is a On 9.
Find your Nike size on the left, read across for On:
| Nike 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. Nike tends to run about half a size small — most people size up half, and lifestyle models (Air Force 1, Blazer) run especially snug. On (On Running) runs true to size for most, with a snug, performance fit.
On to Nike → · Nike chart · On chart · Brand finder
What is a Nike 9.5 in On?
A Nike 9.5 is about a On 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do Nike and On fit the same?
No — Nike runs small and On runs true to size, so size down half a size when you switch.
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