What is the most reliable way to convert shoe sizes?

Measure foot length in centimeters and map that length to each region's scale. CM is the most consistent anchor across US, UK, EU, and JP labels.

Are EU and US shoe sizes the same number?

No. EU and US use different scales; the same foot length gets different numeric labels in each system.

Sizing Knowledge Hub

Quick answer:

Knowledge hub for international shoe and clothing sizing: EU vs US systems, foot length in cm, conversion methodology, and links to guides.

Quick Answer

International sizing uses different labels for the same foot or body length. The EU sizing system, US shoe sizing scale, and UK numbers are not interchangeable without conversion—foot length in cm is the clearest shared reference for international shoe size conversion.

Core topics

EU sizing system — Often tied to Paris-point / length-based scales; differs from US whole and half sizes.
US shoe sizing scale — Separate progressions for men's, women's, and kids'.
International shoe size conversion — Always cross-check with brand charts; use our shoe size converter for standardized length mapping.
Foot length in cm — Measure on a hard floor, end of day, longest foot; then convert to regional labels.

Authority pages & tools

Educational guides (semantic)

Example comparison (men's length anchor)

EU	US (men's)
40	7
42	9
44	10

Values are typical chart equivalents; brand fit may differ.

Why sizes may vary

Manufacturing lasts, materials, width (narrow/regular/wide), and regional averages all change how a labeled size feels. Use measurements and brand charts when possible.

Frequently asked questions

What is EU 42 in US shoe size?

EU 42 is commonly about US men's 9; women's lines differ. Confirm with gender and brand.

How do I convert US shoe sizes to UK?

Map through foot length in cm or use a dedicated US to UK conversion hub and the converter.

Common questions

How should I use this converter?

Pick your region and size, then read the equivalents. When in doubt, measure in centimeters and compare to the brand chart.

Why do sizes differ between countries?

Each region uses its own scale; mapping through foot length (cm) reduces error.

More on Sizing Knowledge Hub

See linked guides on this site for measurement tips and regional differences.

Data sources

ISO and regional footwear sizing references (length-based mapping)
Published brand size charts (e.g. Nike, Adidas) for cross-checks—not endorsements
International measurement and apparel sizing studies (public summaries)