For most adult shoes, EU size 40 is usually a UK size 6.5–7 , depending on brand, gender, and shoe style.

Quick scoop: what is size 40 in UK shoes?

  • Many conversion charts show EU 40 ≈ UK 6.5 for women’s shoes.
  • Some charts list EU 40 ≈ UK 6 or UK 7 for men, so there is a little variation.
  • In US sizing, EU 40 is often around US women’s 9–9.5 and US men’s 7.

Simple conversion table (EU 40 focus)

[5][7] [7][9] [8][1][5] [9][7]
System Typical size for EU 40 Notes
UK (women) UK 6.5–7 Often shown as UK 6.5 in standard charts.
UK (men) UK 6–6.5 Some charts round EU 40 to UK 6 or 6.5.
US (women) US 9–9.5 Brand charts commonly pair EU 40 with US 9–9.5.
US (men) US 7 Men’s conversion often lists EU 40 as US 7.

Why you see different answers

Brands don’t follow one strict global standard, so a EU 40 from one brand might feel closer to UK 6.5, and another might feel like UK 7. Always check the specific brand’s size chart and, if possible, your foot length in mm for the best fit.

In practice: if you usually wear EU 40, start with UK 6.5–7 and adjust based on the brand’s own chart and reviews.

TL;DR: Size 40 in EU shoes is most often a UK 6.5–7 , with minor differences between men’s and women’s charts and between brands.

Information gathered from public forums or data available on the internet and portrayed here.