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Shoe Size Converter

US, UK, EU and CM shoe sizes for men and women.

Best for: Use it when buying shoes from another country or online where sizing differs.

Complete guide

Input

9
US
8.5
UK
42
EU
28.7
CM
11.3
inches
How it's calculated & sources
The Shoe Size Converter uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Approximations: EU ≈ US + 33 (men). UK ≈ US − 0.5. CM ≈ (US + 34) / 1.5. Women's US = Men's US + 1.5.

Example

US 9 men ≈ UK 8.5 ≈ EU 42 ≈ 28.7 cm ≈ 11.3 in. (JP sizing ≈ the CM value.)

Frequently asked questions

Are sizes exact?+

No — brand last and fit vary. This gives a reliable starting point.

Is conversion real-time?+

Yes — values update instantly as you type in either field, with full bidirectional input.

Where does the shoe size reference come from?+

All factors are SI-anchored using internationally accepted conversions.

Continue your journey

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Shoe Size?
A shoe size converter maps a shoe size between US, UK, EU and centimetre (foot length) scales.
Why does Shoe Size matter?
The nearest size in the target region's scale; confirm by foot length in cm because brands vary.
How is Shoe Size calculated?
It uses standard size charts that relate each region's numbering to foot length, separately for men, women and kids. Formula: Foot length drives the size; roughly US = UK + 1 (adult); EU is about US + 33 for men. Always check by foot length in cm..
What are common shoe size mistakes?
Ignoring men's vs women's vs kids' scales, which differ.
When should you use the Shoe Size Converter?
Use it when buying shoes from another country or online where sizing differs.

What is the Shoe Size Converter?

A shoe size converter maps a shoe size between US, UK, EU and centimetre (foot length) scales.

How the Shoe Size Converter works

It uses standard size charts that relate each region's numbering to foot length, separately for men, women and kids.

Foot length drives the size; roughly US = UK + 1 (adult); EU is about US + 33 for men. Always check by foot length in cm.

Common mistakes to avoid

  • Ignoring men's vs women's vs kids' scales, which differ.
  • Trusting a single formula - brands vary, so measure your foot in cm.
  • Forgetting width, which charts don't capture.

Keywords: shoe, size, us, eu.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Shoe Size Converter free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Shoe Size Converter?+

Shoe Size Converter uses the standard shoe size formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Shoe Size Converter runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Shoe Size Converter on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Title: I built/used this free shoe size converter — instant, no signup

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Shoe Size Converter on Free Tools Galaxy — US, UK, EU and CM shoe sizes for men and women. https://freetoolsgalaxy.com/tools/shoe-size-converter
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# Shoe Size Converter — the free tool I keep coming back to

US, UK, EU and CM shoe sizes for men and women.

Try it: https://freetoolsgalaxy.com/tools/shoe-size-converter
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The fastest way is to use a free in-browser shoe size converter: https://freetoolsgalaxy.com/tools/shoe-size-converter. US, UK, EU and CM shoe sizes for men and women.

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