On Running Size & Width Guide
True to size · Slightly narrow · Cloud 5 Waterproof: size up ½
Find your On Running size with On’s men’s and women’s chart and style-by-style fit advice — or stop in for a fitting at our Kettering, Ohio store.
How it fits
Most On styles fit true to size, with a slightly narrower fit than many running brands.
Between sizes
Between sizes? Size up if you wear thick socks or orthotics, or you're on your feet all day. Choose the smaller size if you like a snug, athletic fit.
Widths
| Width | Available in |
|---|---|
| Standard | All models |
| Wide | Select road running models (“Wide” in the name) |
On women’s and men’s sizes are on separate scales. Use the chart for your own size range.
Women
| US | UK | EU | Foot length (in) | Foot length (cm) |
|---|---|---|---|---|
| 5 | 3 | 36 | 8.66" | 22 |
| 5.5 | 3.5 | 36.5 | 8.86" | 22.5 |
| 6 | 4 | 37 | 9.06" | 23 |
| 6.5 | 4.5 | 37.5 | 9.25" | 23.5 |
| 7 | 5 | 38 | 9.45" | 24 |
| 7.5 | 5.5 | 38.5 | 9.65" | 24.5 |
| 8 | 6 | 39 | 9.84" | 25 |
| 8.5 | 6.5 | 40 | 10.04" | 25.5 |
| 9 | 7 | 40.5 | 10.24" | 26 |
| 9.5 | 7.5 | 41 | 10.43" | 26.5 |
| 10 | 8 | 42 | 10.63" | 27 |
| 10.5 | 8.5 | 42.5 | 10.83" | 27.5 |
| 11 | 9 | 43 | 11.02" | 28 |
Men
| US | UK | EU | Foot length (in) | Foot length (cm) |
|---|---|---|---|---|
| 7 | 6.5 | 40 | 9.84" | 25 |
| 7.5 | 7 | 40.5 | 10.04" | 25.5 |
| 8 | 7.5 | 41 | 10.24" | 26 |
| 8.5 | 8 | 42 | 10.43" | 26.5 |
| 9 | 8.5 | 42.5 | 10.63" | 27 |
| 9.5 | 9 | 43 | 10.83" | 27.5 |
| 10 | 9.5 | 44 | 11.02" | 28 |
| 10.5 | 10 | 44.5 | 11.22" | 28.5 |
| 11 | 10.5 | 45 | 11.42" | 29 |
| 11.5 | 11 | 46 | 11.61" | 29.5 |
| 12 | 11.5 | 47 | 11.81" | 30 |
| 12.5 | 12 | 47.5 | 12.01" | 30.5 |
| 13 | 12.5 | 48 | 12.20" | 31 |
| 14 | 13.5 | 49 | 12.40" | 31.5 |
Fit by style
| Style | Recommendation |
|---|---|
| Cloud 6 / Cloud 6 Wide | True to size |
| Cloud 5 Waterproof | Size up ½ — runs about a half size small |
| Cloudnova 2 / Cloudnova Form 2 | True to size |
| THE ROGER Advantage | True to size |
| Cloudgo (Regular and Wide) | True to size |
| Cloudvista 2 / 3 / 2 Waterproof | True to size |
| Cloud X 3 | True to size |
How to measure
- Stand on a sheet of paper, with your weight on that foot.
- Mark the back of your heel and the tip of your longest toe.
- Measure between the marks in inches or centimeters.
- Measure both feet and use the longer one.
- Measure later in the day, when feet are at their largest, wearing the socks you’ll wear with the shoes.
Need help? We measure every customer with a Brannock device at our Kettering store. Stop in for a fitting, or call us at 937.298.1801 and we’ll help you choose. Ready to shop? Shop all On →
Source: On size chart; fit by style from on.com product pages · Last checked October 2026