Size 40 in UK Shoes: Complete EU to UK Conversion Chart

Ordering shoes online from a European retailer without a conversion chart is a quick path to the wrong fit—and returns are a hassle nobody needs. EU size 40 sits in that middle zone where UK sizing gets a little fuzzy: sometimes a 6, sometimes a 6.5, sometimes a 7 depending on which chart you’re looking at. This guide cuts through the mixed signals with actual data from retailers and specialists, so you know exactly what size 40 means when you’re shopping UK or Irish brands.

EU 40 Common UK Equivalent: 6 to 7 · UK 7 Typical EU Range: 40 to 41 · Ireland Shoe Sizing Note: UK identical

What size is 40 in UK shoes?

Across multiple retailer charts, EU size 40 most consistently maps to a UK 6.5 for standard adult shoes. This holds true for both men’s and women’s sizing according to Foot Locker’s comprehensive guide, which provides detailed EU-to-UK mappings alongside foot length measurements. Buchanan Orthotics, a UK specialist clinic, confirms the same conversion in their clinician-facing sizing table.

Men’s vs Women’s differences

• Laughing Hens lists UK 6.5 = EU 40 exactly for both men’s and women’s charts
• O’Neills women’s sizing shows UK 7 = EU 40 with a foot length of 254 mm
• The gender difference in same-EU conversions is typically half a size at most

Brand variations

Foot Locker cautions that brand-specific sizing can shift the equivalent by half a size or more. Famous Footwear shows EU 40 = UK 5 for men’s shoes in their charts, while Wide Fit Shoes maps UK 7 = EU 40 for men’s footwear. This variation is why checking the brand’s own guide matters more than relying on any single conversion table.

The implication: the standard conversion holds, but your actual fit depends on the manufacturer’s sizing philosophy. Wider brands may use EU 40 to mean something closer to UK 6, while narrower styles might treat it as closer to UK 7.

Is a size 40 a 7?

The short answer is: sometimes, but not always. Most charts land on UK 6.5 as the standard equivalent for EU 40, which sits between UK 6 and UK 7. However, several retailers show EU 40 aligning with UK 7 specifically, particularly for women’s shoes.

Common mappings

According to Laughing Hens’ retail charts, UK 6.5 matches EU 40 exactly for both genders. O’Neills, an Irish sports retailer, lists UK 7 as the women’s equivalent for EU 40, with a foot length of 254 mm. Horner Shearing’s conversion PDF shows EU 40 as UK 6.5-7, acknowledging the range.

Factors affecting fit

Width, instep height, and the intended use of the shoe all influence which UK “half size” makes more sense for a given foot. Foot Locker recommends confirming with your brand size guide because of these variations. Wide Fit Shoes’ chart shows UK 7 = EU 40 for men’s, while Famous Footwear shows EU 40 = UK 5 for their men’s range, highlighting the brand-specific nature of these conversions.

The catch: “Is a size 40 a 7?” depends on which chart you look at. For shopping purposes, you may need both UK 6.5 and UK 7 in your size search.

What is size 40 in Ireland?

Ireland uses the same shoe sizing system as the United Kingdom. O’Neills, an Irish sporting goods retailer, explicitly confirms that all footwear on their website is listed using Ireland/UK sizes—the two systems are identical. No conversion is required when shopping Irish brands for EU 40.

Guineys guide specifics

Guineys, another Irish retailer, follows the same UK sizing conventions for their footwear range. The sizing charts align directly with UK equivalents, meaning EU 40 in Ireland is treated the same way it would be in British stores.

UK-Ireland alignment

O’Neills’ conversion charts place EU 40 at UK 7 for women’s sizing with a length measurement of 254 mm. Arnotts.ie, a traditional Irish department store, uses comparable conversion charts. The lack of a distinct “Irish size” means consumers in Ireland can reference UK size charts directly.

The pattern: there’s no Ireland-specific sizing anomaly to worry about. UK and Ireland share sizing conventions, so your EU 40 to UK 6.5 conversion works equally well in either market.

Is a UK Size 7 an EU 40 or EU 41?

UK size 7 typically falls between EU 40 and EU 41. Begg Shoes, a UK specialist retailer, maps UK 7 directly to EU 41 in their conversion guide. However, O’Neills’ women’s chart shows UK 7 = EU 40 exactly. The variation reflects the fact that adjacent sizes often share EU equivalents across different brands.

Reverse conversion

For shoppers working backwards from a UK 7: Grivet Outdoors places US men’s 7 as equivalent to EU 40 and UK 6.5. Wikipedia’s conversion formula (UK size = (EUR – 2)/1.27 – 23) yields approximately 6.5 for EU 40, confirming the overlap between UK 6.5, UK 7, EU 40, and EU 41 in practical retail scenarios.

Chart examples

Begg Shoes’ global conversion guide shows UK 7 = EU 41 for men’s shoes. Famous Footwear’s women’s chart maps US 9 = EU 40, corresponding to UK 7 in their system with slight variance noted. Wide Fit Shoes lists UK 7 = EU 40 for men’s wide-fit styles, emphasizing how width categories affect these mappings.

What this means: if you’re trying to match a UK 7 to an EU size, expect EU 40 or EU 41 depending on the brand. The overlap exists because half sizes and width variations create practical equivalencies rather than strict one-to-one mappings.

What is a UK 7 in EU sizes?

A UK 7 most commonly converts to EU 40 or EU 41 depending on the specific chart consulted. Grivet Outdoors’ international conversion shows EU 40 men’s = UK 6.5 with US 7, placing UK 7 at the border of EU 40 and EU 41. Begg Shoes maps UK 7 = EU 41 directly.

Standard ranges

The typical range for UK 7 is EU 40-41 in men’s sizing and EU 40-41 in women’s, with slight gender-based variation. Famous Footwear’s men’s chart shows EU 40 = UK 5, suggesting UK 7 would fall at approximately EU 42 in their system. This brand-specific variance is why multiple sources should be consulted.

Commerce site charts

Grivet Outdoors provides US/UK/EU triple-column charts with cm and inch measurements. O’Neills includes foot length data (254 mm) alongside their UK 7 = EU 40 women’s mapping. Famous Footwear notes brand-specific variance in their sizing tables, with EU 40 showing as UK 5 for some men’s styles and UK 7 for some women’s styles.

The trade-off: UK 7 buyers should be prepared to check both EU 40 and EU 41 options when ordering from European brands. The ambiguity isn’t resolvable without consulting the specific manufacturer’s chart.

EU to UK Shoe Size Conversion Chart

Five retailers, one clear pattern: EU 40 consistently maps to UK 6.5 across specialist charts and major retailers.

EU 40 Shoe Size Specifications

Three measurement systems, one foot length range: EU 40 sits at the intersection of EU, UK, and US sizing conventions.

Confirmed Facts and What Remains Unclear

Foot Locker (major UK retailer) states: “An EU size 40 generally corresponds to a UK size 6.5 in women’s shoes and can be around a UK 6.5 for men’s shoes as well. Always confirm with your brand size guide.”

— Foot Locker Guide

O’Neills (Irish retailer) confirms: “All footwear on the website are listed using Ireland/UK shoe sizes.”

— O’Neills Help Centre

Summary

EU size 40 most reliably converts to UK 6.5 across specialist and retail sizing charts. For women’s sizing specifically, some charts map EU 40 to UK 7, creating a practical overlap between UK 6.5 and UK 7 when shopping European brands. Ireland uses the same sizing system as the UK, requiring no special conversion adjustments. The critical variable is brand-specific sizing: Foot Locker, Buchanan Orthotics, and O’Neills all emphasize checking the manufacturer’s own size guide as the final authority. For UK and Irish shoppers ordering EU-sized shoes, the bottom line is straightforward: EU 40 lands around UK 6.5, with UK 7 as a viable backup option—but always verify against the specific brand’s chart before committing to a purchase.

Related reading: 200 cm in Feet Conversion Guide

While size 40 often aligns with UK 6.5 for women, comprehensive EU to UK shoe size charts detail equivalents for men, women, and kids across major brands.

Frequently asked questions