What Shoe Size Am I?
Measure your larger foot in millimetres, then convert through foot length instead of label-to-label guesses. Foot length is the shared axis behind US, UK, EU and CM sizing.
Foot length to shoe size calculator
| Foot length (mm) | US Men | US Women | UK | EU | CM |
|---|---|---|---|---|---|
| 220 | 4 | 5.5 | 3 | 33 | 22 |
| 230 | 5 | 6.5 | 4 | 35 | 23 |
| 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 |
How to get the right input
- Stand on paper at the end of the day, when feet are usually at their largest.
- Trace both feet while standing, then measure heel-to-longest-toe in millimetres.
- Use the larger foot in the calculator and compare the result with the brand guide.
- If you are between sizes, start larger for performance shoes and longer walking days.
For a fuller measuring walkthrough, use the foot measuring guide.
Then check brand fit
The calculator gives the length-based starting point. The final buying size can move by a half size because brands use different lasts, toe shapes and width options.
What shoe size am I if my foot is 27 cm?
A 27 cm (270 mm) foot is usually about US men's 9, UK 8 and EU 42 on the standard length formula. Brand fit still matters, so check the brand guide before buying.
Should I use my larger foot to choose shoe size?
Yes. Measure both feet and use the larger foot as the starting point. If the smaller foot slips, adjust with lacing, sock thickness or an insole rather than buying too short.
What if I am between shoe sizes?
Most buyers between sizes should start with the larger size, especially for running shoes or long walking days. Size down only when the brand is clearly roomy and returns are easy.