Nike Shoe Sizing Guide: Do They Run Small?
Many Nike shoes feel about half a size small, so half a size up is often the first size to check if you are between sizes. The Air Force 1 is the exception — it often fits true to size. Nike also runs a narrow toe box, so wide-footed buyers should pay closer attention to the model than the size.
Across our data Nike runs small: 55% of wearers report it runs small, 40% true to size and 5% large.
Nike sizing philosophy
Nike builds around a relatively low-volume, narrow last that traces back to its running heritage — shoes designed to lock the foot down for forward motion rather than to give it room to spread. That design philosophy is why "Nike runs small" has become received wisdom even though the length offset is modest: it is the narrow toe box, more than the length, that people feel.
Because Nike grades its lifestyle and performance lines on different lasts, there is no single "Nike size." A basketball silhouette, a Pegasus runner and an Air Max all share a label but not a fit. The brand publishes one official chart, but treats it as a starting point — which is exactly why we layer measured fit data on top of it.
How Nike models differ
There is no single "Nike size" — different lines are graded on different lasts. Here is how the key models compare:
- Air Force 1
- The outlier: a chunky, generously lasted court shoe that fits true to size. Start by checking your normal US size — sizing up can leave the heel swimming.
- Running (Pegasus, React, Vaporfly)
- The line that genuinely runs small and narrow. Half a size up is the standard recommendation, and a full size for the racing lasts.
- Air Jordan 1
- Roughly true to size but narrow through the midfoot; wide feet often go half a size up purely for width relief.
Practical sizing advice
If you normally wear US 9, start by checking Nike in US 9.5 — except for the Air Force 1, where US 9 is the better first check.
If your feet are wide
Nike is predominantly a standard (D) width brand, so there is no true wide grade for most models. Wide-footed buyers should look to the FlyEase range and the more generously lasted lifestyle silhouettes (Air Force 1, Air Max) rather than the narrow running lasts.
If you wear US 9, start by checking Nike in US 9.5
This table starts from the US size you wear in a true-to-size brand, converts it to a foot length, and applies Nike's measured fit so you can see the first size to check — plus the UK, EU and CM equivalents.
| You normally wear (US) | Foot length | Check Nike (US) | UK | EU | CM |
|---|---|---|---|---|---|
| US 7 | 246mm | US 7.5 | 6 | 37 | 24.5 |
| US 8 | 254mm | US 8.5 | 7 | 38 | 25.5 |
| US 9 | 262mm | US 9.5 | 8 | 39 | 26 |
| US 10 | 271mm | US 10.5 | 9 | 41 | 27 |
| US 11 | 279mm | US 11.5 | 10 | 42 | 28 |
| US 12 | 288mm | US 12.5 | 11 | 43 | 29 |
EU sizes are always rounded to a whole size — there is no exact half-size equivalent. The recommended Nike size applies this brand's average fit; individual models still vary, so check the model notes above.
Full Nike size conversion
For the complete Nike size chart with US, UK, EU and CM by foot length, the reported-fit distribution and our sources, visit the Nike brand hub.