Everyday Life · Unit Conversions
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and CM (foot length) sizing systems for men, women, and children.
Calculator
Formula
All conversions pass through EU size as an intermediate. EU size = foot length (cm) × 1.5 + 2. US men's ≈ EU − 33, US women's ≈ EU − 31, UK men's ≈ EU − 33.5, UK women's ≈ EU − 33.
Source: ISO/TR 19407:2015 Footwear — Sizing — Conversion of sizing systems; Brannock Device Co. standards.
How it works
All conversions use EU size as the intermediate standard. EU size = foot length (cm) × 1.5 + 2. US men's ≈ EU − 33, US women's ≈ EU − 31, UK men's ≈ EU − 33.5, UK women's ≈ EU − 33. Kids' sizes follow a separate scale.
These offsets differ by gender because men's and women's lasts were historically calibrated differently. Always check the brand's own size chart for precision footwear.
Worked example
Men's US 10 → other systems:
EU = 10 + 33 = 43
UK = 43 − 33.5 = 9.5
CM = (43 − 2) / 1.5 = 27.3 cm
Women's EU 39 → other systems:
US = 39 − 31 = 8
UK = 39 − 33 = 6
CM = (39 − 2) / 1.5 = 24.7 cm
Limitations & notes
These are standard average offsets. Individual brands may deviate by half a size. Half sizes and width fittings are not accounted for. Always measure both feet and size to the larger foot.
Frequently asked questions
What is the difference between US men's and US women's shoe sizes?
Women's sizes run approximately 1.5–2 sizes larger than men's for the same foot length. US men's 8 ≈ US women's 9.5–10.
How do I convert EU sizes to US?
Men's: US = EU − 33. Women's: US = EU − 31. Example: EU 42 men's = US 9.
Is EU sizing consistent across Europe?
Mostly yes. Some Italian luxury brands deviate slightly. Always check the brand's chart for expensive purchases.
Why do sizes differ between brands?
Different brands use different lasts — the moulds over which shoes are built — causing the same nominal size to fit differently.
What is Mondopoint sizing?
An ISO system expressing foot length in millimetres. Used for ski boots and military footwear. 260mm = ~EU 41 = US men's 8.5.
Last updated: 2025-01-15 · Formula verified against primary sources.