US to UK Shoe Size Conversion
UK men's sizes run one full size below US men's at the same foot length: US 9 equals UK 8. The barleycorn formula is UK = (foot length in inches × 3) − 23. This is why en-GB and en-US charts differ even for the same physical shoe.
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
| US Men | UK Men | Foot (mm) |
|---|---|---|
| 6 | 5 | 237 |
| 7 | 6 | 246 |
| 8 | 7 | 254 |
| 9 | 8 | 262 |
| 10 | 9 | 271 |
| 11 | 10 | 279 |
| 12 | 11 | 288 |
| 13 | 12 | 296 |
Formula (Layer A): UK = round_to_half((foot_length_inches × 3) − 23). See how we calculate for the full methodology.
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What is US size 9 in UK?
US men's 9 equals UK 8 for the same foot length — UK barleycorn sizing runs one full size below US men's.
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: