Shoe Size Conversion
US / UK / EU / Foot Length
Note: Shoe sizing varies by brand and shoe last — treat these as approximate starting points, not exact fits.
Ready for Calculation
Enter your foot length to see approximate shoe sizes across sizing systems.
Why Shoe Sizes Don't Match Across Countries
Unlike height or weight, shoe size isn't a standardized physical unit — it's a brand- and region-specific numbering scheme originally based on tools like the Brannock Device. That's why the same physical foot length can correspond to different numbers in the US, UK, and EU.
Foot Length Is the Common Ground
Measuring your actual foot length in centimeters is the most reliable way to compare across sizing systems, since it's the one truly universal, brand-independent measurement.
EU Sizing (Paris Point System)
EU sizes are based on the "Paris point," where each whole size represents about 2/3 of a centimeter of internal shoe length — a very different logic than the US system.
How to Measure Your Foot
Stand on a piece of paper against a wall, mark your longest toe and heel, then measure the distance between the marks. Measure both feet — most people have one foot slightly larger — and size for the larger one.
Measure at Day's End
Feet swell slightly throughout the day — measuring in the evening gives a more realistic fit for all-day wear.
Key Takeaways
- Approximate Only: These conversions use common industry averages — always check a specific brand's own size chart when possible.
- Width Matters Too: Length conversion alone doesn't account for shoe width, which also varies significantly between brands and regions.
- Kids' Sizing Differs: Children's shoe sizes use a completely separate numbering scale from adult sizes in most systems.