Shoe sizes can feel confusing because every region uses a different system. Many people see EU size numbers while shopping online and wonder what they mean in UK sizing. One of the most common questions is simple. What is size 40 in UK shoes?
Size 40 is one of the most popular EU sizes. Knowing its exact UK match helps you shop with confidence and avoid returns. See below:
Women’s Shoe Size
- EU 40 = UK 6
Men’s Shoe Size
- EU 40 = UK 6.5
Why EU and UK Sizes Are Different?
EU sizes use whole numbers. UK sizes use numbers with half steps. This creates small differences in fit. EU sizes measure shoe length inside the shoe. UK sizes follow a different measuring standard. This is why conversions are needed when ordering from foreign stores.
Understanding this helps you choose footwear more accurately, from sneakers to dress shoes and even White shoes that match your outfits.
Full Conversion Chart for EU to UK Sizes
Below is a clean combined table for men, women, and kids. This makes it easy to find the right size for any shoe category.
| EU Size | UK Women | UK Men | UK Kids |
| 35 | 2.5 | — | 2.5 |
| 36 | 3.5 | — | — |
| 37 | 4 | — | — |
| 38 | 5 | — | — |
| 39 | 6 | 5 | — |
| 40 | 6 | 6.5 | — |
| 41 | 7 | 7 | — |
| 42 | 8 | 8 | — |
| 43 | 9 | 9 | — |
| 44 | — | 9.5 | — |
| 45 | — | 10.5 | — |
| 46 | — | 11 | — |
How to Know if Size 40 Will Fit You Well
Even with conversions, the fit can vary. Brands use different molds, and some materials stretch more than others.
Here are helpful points before choosing size 40.
Check foot length
Measure your heel to toe. Compare the measurement with the brand’s chart. Most EU 40 shoes fit a foot length of about 25 cm.
Chart for Foot Length
| Foot Length (cm) | EU Size | UK Size |
| 24.5 | 39 | 6 |
| 25.0 | 40 | 6 or 6.5 |
| 25.5 | 41 | 7 |
These charts offer a clearer view of how sizes change between regions.
Know shoe type
Sports shoes may run tighter. Heels and loafers may run wider. Leather shoes can soften over time. If the pair feels tight, you can try methods to help your Stretch Shoes for a better fit.
Consider socks
Thick socks change how the shoe fits. This matters when choosing winter footwear.
Conclusion
EU size 40 is one of the most common shoe sizes. It equals UK 6 in women’s shoes and UK 6.5 in men’s shoes. With the conversion charts above, you can select the correct size for any brand or style. Understanding these numbers saves time and gives you a better online shopping experience.