Does the On Cloud 5 Run Big or Small?
The On Cloud 5 (Running) runs about a half-size small with a narrow toe box. See the US/UK/EU/CM conversion chart and what size to order.
How the Cloud 5 fits
The On Cloud 5 (Running) runs about a half-size small. Compared with a true-to-size sneaker, we recommend going up a half size from your usual. It has a narrow toe box and moderate arch support, with a textile upper that shapes how the fit settles over time.
Cloud 5 fit specs
| Category | Running |
| Length Fit | Runs Small (~½ size) |
| Toe Box Profile | Narrow |
| Arch Support | Moderate |
| Upper Material | Textile |
Size conversion chart
US, UK, EU and centimetre equivalents. Use it alongside the fit note above to land the right size in the Cloud 5.
| US | UK | EU | CM |
|---|---|---|---|
| 4 | 3 | 36 | 22 |
| 4.5 | 3.5 | 36.5 | 22.5 |
| 5 | 4 | 37 | 23 |
| 5.5 | 4.5 | 37.5 | 23.5 |
| 6 | 5 | 38 | 24 |
| 6.5 | 5.5 | 38.5 | 24.5 |
| 7 | 6 | 39 | 25 |
| 7.5 | 6.5 | 40 | 25.5 |
| 8 | 7 | 41 | 26 |
| 8.5 | 7.5 | 41.5 | 26.5 |
| 9 | 8 | 42 | 27 |
| 9.5 | 8.5 | 42.5 | 27.5 |
| 10 | 9 | 43 | 28 |
| 10.5 | 9.5 | 44 | 28.5 |
| 11 | 10 | 44.5 | 29 |
| 11.5 | 10.5 | 45 | 29.5 |
| 12 | 11 | 46 | 30 |
| 12.5 | 11.5 | 46.5 | 30.5 |
| 13 | 12 | 47 | 31 |
| 13.5 | 12.5 | 47.5 | 31.5 |
| 14 | 13 | 48 | 32 |
| 14.5 | 13.5 | 48.5 | 32.5 |
| 15 | 14 | 49 | 33 |
Frequently asked questions
Does the On Cloud 5 run big or small?
The On Cloud 5 runs about a half-size small. Compared with a true-to-size sneaker, we recommend going up a half size from your usual.
What size should I get in the On Cloud 5?
If you normally wear a US 10, target a US 10.5 in the Cloud 5. A US 9 foot maps to about US 9.5 and a US 11 to about US 11.5, because the model runs about a half-size small.
Is the On Cloud 5 wide or narrow?
It has a narrow toe box that hugs the foot. Upper material is textile, which affects how much it gives over time.
What kind of arch support does the On Cloud 5 have?
Arch support is rated moderate on the Cloud 5 (Running). It offers a balanced, everyday level of support.
Compare the Cloud 5 to another shoe
Select both shoes to see your sizing verdict
| Spec | On Cloud 5 | Shoe B |
|---|---|---|
| Length Fit | Runs Small (~½ size) | — |
| Toe Box Profile | Narrow | — |
| Arch Support | Moderate | — |
| Upper Material | Textile | — |