CM / Mondopoint to US Shoe Size
Mondopoint (CM) is the most honest sizing axis: it is your foot length in centimetres. US 9 corresponds to roughly 27 cm (270 mm). We recommend measuring in millimetres and converting through the canonical axis rather than trusting label-to-label charts alone.
Try the conversion
| Foot length (mm) | US Men | US Women | UK | EU | CM |
|---|---|---|---|---|---|
| 240 | 6.5 | 8 | 5.5 | 36 | 24 |
| 250 | 7.5 | 9 | 6.5 | 38 | 25 |
| 260 | 8.5 | 10 | 7.5 | 39 | 26 |
| 270 | 10 | 11.5 | 9 | 41 | 27 |
| 280 | 11 | 12.5 | 10 | 42 | 28 |
| 290 | 12.5 | 14 | 11.5 | 44 | 29 |
| 300 | 13.5 | 15 | 12.5 | 45 | 30 |
| 310 | 14.5 | 16 | 13.5 | 47 | 31 |
Quick conversion table
| CM | US Men | Foot (mm) |
|---|---|---|
| 24 | 6.5 | 240 |
| 25 | 7.5 | 250 |
| 26 | 8.5 | 260 |
| 27 | 10 | 270 |
| 28 | 11 | 280 |
| 29 | 12.5 | 290 |
| 30 | 13.5 | 300 |
| 31 | 14.5 | 310 |
Formula (Layer A): US men = round_to_half((cm / 2.54 × 3) − 22). See how we calculate for the full methodology.
How to read this conversion
The anchor row converts CM 28 to 280mm first, then displays it as US Men 11. 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.
- CM/Mondopoint is closest to the raw measurement: 27.0 CM means roughly a 270mm foot.
- 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 US size is 27 cm foot length?
A 27 cm (270 mm) foot typically equals US men's 9 on the barleycorn formula — Mondopoint is the most honest axis.
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 CM / Mondopoint Conversion.