What Shoe Size Am I?
Start with your larger foot in millimetres, convert from length, then check the brand guide before buying.
Key takeaways
- Measure both feet while standing, ideally late in the day when feet are at their largest.
- Use the larger foot as the buying reference; a shoe that is too short is harder to fix than a little extra volume.
- Keep foot length in millimetres as the shared reference across US, UK, EU and CM systems.
- After the formula, check the brand and model page because fit offset can move the final size by a half size or more.
How to use this guide
Use this page as a decision aid before opening a brand or model guide. The formula gives the starting point; brand fit decides the final choice.
If you already know the brand, open its size guide and compare the fit verdict, width availability and source confidence before buying.
What is the quick rule for what shoe size am i??
The practical rule is: Measure both feet while standing, ideally late in the day when feet are at their largest.