Nike vs Brooks Shoe Size — Which Runs Smaller?
Nike runs about half a US size small compared to Brooks. If you wear Nike in US 9, start by checking Brooks in US 8. Both brands use the same foot-length measurement — the difference is in the last shape, not the conversion formula.
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Switching rule for this pair
At the US 9 anchor, the same 262mm foot maps to Brooks US 8. In plain terms: when moving from Nike to Brooks, go down 1 US size.
- Nike: runs small signal from 55% of buyer-fit data.
- Brooks: true to size signal from 65% of buyer-fit data.
- If you know your foot length in millimetres, use the Size Passport above before trusting a label-to-label switch.
Nike → Brooks size chart
| US Men (Nike) | Nike → Brooks | Foot length |
|---|---|---|
| 7 | 6 | 246mm |
| 8 | 7 | 254mm |
| 9 | 8 | 262mm |
| 10 | 9 | 271mm |
| 11 | 10 | 279mm |
Fit verdict
- Nike: Runs small (55% of buyers)
- Brooks: True to size (65% of buyers)
Why the sizes differ
Nike runs ~0.5 size smaller than Brooks.
Nike foot length is measured in millimetres, then mapped to US size. The Brooks last fits the same foot, but the starting label shifts by about half a US size because of each brand's fit bias — not a different conversion formula.