KEEN vs On shoe sizing
Compare KEEN and On shoe sizes in EU, US and UK. Use this chart to see size differences and check whether KEEN or On runs smaller or larger.
Choose your size to see the result.
| KEEN (EU) | On (EU) | Baseline (CM) |
|---|---|---|
| 39.5 | 39.5 | 24.4 |
| 40 | 40 | 24.8 |
| 40.5 | 40.5 | 25.4 |
| 41 | 40.5 | 25.7 |
| 42 | 41 | 26 |
| 42.5 | 42 | 26.7 |
| 43 | 42.5 | 27 |
| 44 | 43 | 27.3 |
| 44.5 | 44 | 27.9 |
| 45 | 44.5 | 28.3 |
| 46 | 44.5 | 28.6 |
| 47 | 46 | 29.4 |
| 47.5 | 47 | 30.2 |
| 48 | 48.5 | 31 |
| 48.5 | 50 | 31.8 |
| 49 | 51.5 | 32.6 |
FAQ
How do I convert KEEN to On?
Use the converter above. We map sizes via official chart baselines (cm/EU) when available.
Do these brands run small or large?
Based on official charts, On EU labels are typically -0.5 compared to KEEN for similar foot length (cm). Real fit can vary by model.
What if I’m between sizes?
If you prefer a snug fit, lean down; for extra room, lean up - and always check the brand’s model-specific guidance.