Verified brand-to-brand conversionOn vs Nike shoe sizing
An On US 10 is about a Nike US 11 (EU 45) in men's sizes. Nike fits about a full size smaller at the same printed size, so expect to take about a full size up in Nike, based on both brands' official size charts.
Matched by foot length from both brands' published size charts · Updated July 2026
Convert your On size to Nike
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On to Nike size chart
Each row matches by foot length, the key both brands print their charts in. Sizes outside either brand's published range are not shown.
Men's
| On US | Foot (cm) | Nike US | Nike EU |
|---|---|---|---|
| 7 | 25.0 | 7.5 | 40.5 |
| 7.5 | 25.5 | 8 | 41 |
| 8 | 26.0 | 9 | 42.5 |
| 8.5 | 26.5 | 9.5 | 43 |
| 9 | 27.0 | 10 | 44 |
| 9.5 | 27.5 | 10.5 | 44.5 |
| 10 | 28.0 | 11 | 45 |
| 10.5 | 28.5 | 11.5 | 45.5 |
| 11 | 29.0 | 12.5 | 47 |
| 11.5 | 29.5 | 13 | 47.5 |
| 12 | 30.0 | 13.5 | 48 |
| 12.5 | 30.5 | 14 | 48.5 |
| 13 | 31.0 | 14.5 | 49 |
| 14 | 31.5 | 15.5 | 50 |
Women's
| On US | Foot (cm) | Nike US | Nike EU |
|---|---|---|---|
| 5 | 22.0 | 5 | 35.5 |
| 5.5 | 22.5 | 5.5 | 36 |
| 6 | 23.0 | 6 | 36.5 |
| 6.5 | 23.5 | 7 | 38 |
| 7 | 24.0 | 7.5 | 38.5 |
| 7.5 | 24.5 | 8 | 39 |
| 8 | 25.0 | 8.5 | 40 |
| 8.5 | 25.5 | 9 | 40.5 |
| 9 | 26.0 | 9.5 | 41 |
| 9.5 | 26.5 | 10.5 | 42.5 |
| 10 | 27.0 | 11 | 43 |
| 10.5 | 27.5 | 11.5 | 44 |
Fit varies by model
Nike
Of 210 tracked Nike models, 27 run large. The rest fit true to the chart. The table above is the brand's standard chart, so check the model before sizing.
On vs Nike: common questions
Does Nike run bigger or smaller than On?
Nike runs about a full size smaller than On: the same foot takes a higher number in Nike, consistently across the size range. For example, an On US 10 maps to a Nike US 11.
Can I buy Nike in my On size?
No. The number on the box means a different foot length in each brand, which is why a straight size-for-size swap misfits. Use the table above or the converter to translate properly.
How do I convert my On size to Nike?
Find your On size in the table above and read across, or use the converter with your exact size. The most reliable method is your measured foot length in centimeters: both brands publish their charts against it, so it translates without guesswork. Half sizes round to the nearest size the brand actually makes.
More brand conversions
Brand size charts: Nike size chart
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