UK to US Shoe Size Conversion
UK 8 equals US men's 9 for the same foot length. UK sizing is one barleycorn step smaller than US men's — not the same number on the label. When buying from US retailers, add one US size to your usual UK men's size as a starting point.
Try the conversion
| Foot length (mm) | US Men | US Women | UK | EU | CM |
|---|---|---|---|---|---|
| 237 | 6 | 7.5 | 5 | 36 | 23.5 |
| 246 | 7 | 8.5 | 6 | 37 | 24.5 |
| 254 | 8 | 9.5 | 7 | 38 | 25.5 |
| 262 | 9 | 10.5 | 8 | 39 | 26 |
| 271 | 10 | 11.5 | 9 | 41 | 27 |
| 279 | 11 | 12.5 | 10 | 42 | 28 |
| 288 | 12 | 13.5 | 11 | 43 | 29 |
| 296 | 13 | 14.5 | 12 | 44 | 29.5 |
Quick conversion table
| UK Men | US Men | Foot (mm) |
|---|---|---|
| 5 | 6 | 237 |
| 6 | 7 | 246 |
| 7 | 8 | 254 |
| 8 | 9 | 262 |
| 9 | 10 | 271 |
| 10 | 11 | 279 |
| 11 | 12 | 288 |
| 12 | 13 | 296 |
Formula (Layer A): US men = round_to_half((foot_length_inches × 3) − 22). See how we calculate for the full methodology.
How to read this conversion
The anchor row converts UK Men 9 to 271mm first, then displays it as US Men 10. That millimetre anchor is why the same size can be compared against brand and model fit without re-entering the number.
- Foot length in millimetres is the pivot; brand fit is applied later on brand and model pages.
- UK men's labels run one full number below US men's for the same foot length.
- US men's labels use the barleycorn formula, then round to the nearest half size.
Save this conversion as your size passport
Save your foot length once, then compare brand and model sizing without retyping it.
Local-only by default. Share links include foot length, width and note in the URL, so use them only with people you trust.
What is UK size 8 in US?
UK men's 8 equals US men's 9 for the same foot length — UK runs one full size below US men's on the barleycorn scale.
Brand-specific sizing (Layer B)
Generic charts ignore fit — Nike runs small, New Balance runs large, Converse runs very small. For a purchase-ready answer with confidence score and sources:
Compare brand fit before buying
Length conversion gets you the starting size. Brand fit can still move the label by a half size.
Reverse conversion
Need the other direction? Use US to UK Shoe Size Conversion.