Shoe Size Converter
Convert common US, UK, and EU adult shoe sizes.
This shoe size converter handles the shoe size conversion between US, UK, and EU sizing systems for men's and women's shoes, since the same foot length is labeled with a different number in each system.
Enter your size in one system, and the converter returns the equivalent size in the others.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| US men's size 9 | EU ≈42, UK ≈8 | EU ≈ 9 + 33 = 42. UK is typically about one size below the US men's size, so ≈8. |
| US women's size 8 | US men's ≈6.5, EU ≈39.5 | US women's sizes run about 1.5 sizes above the equivalent US men's size: 8 − 1.5 = 6.5 men's. EU ≈ 6.5 + 33 = 39.5. |
Why Shoe Sizes Differ by Country
US, UK, and EU shoe sizing systems each use different reference points and increments - a US men's size 9 is roughly a UK size 8 and an EU size 42-43, even though all three describe approximately the same foot length.
Men's vs. Women's Size Conversion
US men's and women's sizes differ by about 1.5-2 sizes for the same foot length (a women's size 8 is roughly a men's size 6.5), so shoe size conversion needs to account for gender sizing convention, not just the country system.
How to Use the Shoe Size Converter
- Open the Shoe Size Converter and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the shoe size converter works.
Frequently Asked Questions
How do I convert a US shoe size to EU?
Add approximately 33 to a US men's size to estimate the EU equivalent, though exact conversions can vary slightly by brand.
What is the difference between men's and women's shoe size conversion?
US women's sizes run about 1.5-2 sizes higher than the equivalent US men's size for the same foot length.
Is shoe size conversion exact across all brands?
Not perfectly - conversion charts provide a close standard estimate, but actual fit can vary by brand and shoe style, so trying on shoes when possible is still recommended.
How do I use this shoe size converter?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Shoe Size Converter calculate?
Convert common US, UK, and EU adult shoe sizes. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this shoe size use?
The formula is: EU ~= US men + 33. The French Paris Point sizing system, which underlies modern EU shoe sizing, was developed by French shoemakers in the 19th century, measuring foot length in units of two-thirds of a centimeter - a historical quirk that produces the seemingly arbitrary offset conversions used today, since the system was never designed to align cleanly with the separately developed US and UK sizing scales.
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Last updated: September 27, 2026.