Size 40 in US: Complete EU 40 to US Conversion Guide

Few things throw off an online order faster than realizing you grabbed the wrong size — and shoe sizing is especially tricky when a European 40 doesn’t match what you’d expect from US labels. The gap between EU and US sizing trips up plenty of shoppers, whether you’re buying running shoes or dress shoes. This guide cuts through the confusion with cross-verified retailer charts, so you get the right number the first time.

EU 40 Men’s Shoes: US 7 (Famous Footwear) · EU 40 Women’s Shoes: US 9 (Famous Footwear) · EU 40 UK Men’s: 6.5 (Famous Footwear)

What is size 40 in USA?

Size 40 in US terms depends on whether you’re shopping men’s or women’s — the same EU number maps to completely different US sizes depending on gender. Retailers standardize around two main equivalents, though minor variations exist between brands.

Men’s shoes

For men’s shoes, EU 40 aligns to US 7 across most major retailer charts. Five verified sources including Famous Footwear and Shoe City confirm this match, and it corresponds to a foot length of approximately 9.625 inches (Zappos notes the measurement sits between US 7-7.5 at 9.6 inches). The slight discrepancy between US 7 and US 7.5 appears because different retailers round differently — Shoe Carnival lists EU 40-41 as US 7.5, while most others land on US 7 exactly. When in doubt, stick with US 7 as your baseline for EU 40 men’s shoes.

The pattern: Grivet Outdoors maps EU 40 men’s to US 9.5 — an outlier that differs from the consensus of US 7 across other retailers. This reflects how some outdoor brands use their own sizing philosophy.

Women’s shoes

Women’s shoes tell a different story. EU 40 corresponds to US 9 for women, with most retailers clustering around this number. Famous Footwear lists both US 9 and US 9.5 for women’s EU 40, while Size.ly confirms the range as US 9-9.5. The Laughing Hens chart shows UK 6.5 for this conversion. What’s important to understand is the men-to-women shift: when the same EU 40 shoe exists in both men’s and women’s versions, a man who wears EU 40 (US 7) would wear US 9 in women’s styles — that’s a +2 size difference that catches many cross-shoppers off guard. Shoe City explicitly notes this relationship in their conversion tables.

What size is 40 in clothing?

Clothing sizes don’t follow the same EU-to-US conversion system as shoes, and this is where the confusion compounds. The research turned up limited specific data on clothing size 40 conversions — most retailer charts focus on shoes rather than apparel.

Men’s clothing

For men’s shirts and tops, EU size 40 typically maps to a medium or large depending on the brand, but there’s no single definitive conversion. ASOS, a major UK retailer, lists size 40 in their men’s shirt charts, but the corresponding US size varies by cut and brand philosophy. A size 40 dress shirt from one European brand might fit like a US medium, while another labels it large. The variation stems from different vanity sizing practices — some brands use EU sizing for reference only, while others follow it strictly.

Women’s clothing

Women’s clothing size 40 faces the same ambiguity. EU 40 doesn’t have a clean US women’s clothing equivalent because US apparel sizing uses its own numbering system (0-20+ for misses) rather than EU sizing. The research notes “no specific clothing size 40 conversions found” across the verified sources — retailer conversion charts tend to be shoe-focused because footwear sizing is more standardized globally, while clothing sizing follows regional conventions more strictly.

The upshot: for clothing, brand-specific measurement charts matter more than any universal conversion. 38 inches in CM: waist and bust size chart provides additional measurement reference for comparing international apparel sizing.

Is size 40 a 7 or 8?

This is one of the most common questions, and the honest answer is: it depends on the gender and the specific retailer’s rounding. For men’s shoes, size 40 is most commonly US 7, not US 8. For women’s shoes, size 40 is most commonly US 9, not US 8. The confusion likely stems from the men-to-women shift — when a man wears US 7 and a woman wears US 9, someone checking the wrong chart might think “size 40 = 7” for men and “size 40 = 9” for women, then incorrectly extrapolate.

Shoe size debates

Online discussions frequently debate whether size 40 is closer to US 7 or 8, and the answer splits by gender:

• Men: EU 40 consistently maps to US 7 across retailer charts — US 8 is too large by roughly 1 inch in foot length
• Women: EU 40 consistently maps to US 9 — US 8 would be a half-size too small based on foot length data

The debate dissolves once you factor in brand variations. Beck Shoes advises that “brand variations exist; always check specific retailer’s chart” because manufacturers use different last shapes and sizing philosophies. A narrow-fit EU 40 might feel like US 7.5, while a wide-fit version could feel closer to US 8 — but this is a fit perception issue, not a true size difference.

Men vs women

The gender divide is sharp: men’s EU 40 lands around US 7, while women’s EU 40 lands around US 9. The +2 shift is consistent across Shoe City, Famous Footwear, and other retailers that publish both men’s and women’s charts. This means if someone tells you “size 40 is like US 8,” they may be confusing men’s and women’s sizing, or they encountered a single outlier chart.

Is EU 40 a size 7 UK?

UK sizing runs roughly one size smaller than US sizing for the same foot length, so EU 40 maps to UK 6.5 for men’s and UK 7 for women’s. The “size 7 UK” question is partially correct for women’s EU 40 but understates men’s — men’s EU 40 is closer to UK 6.5.

UK men’s

Famous Footwear lists EU 40 men’s as UK 6.5, which aligns with the standard UK-US offset of approximately 0.5-1 sizes. The Parade Protection chart confirms EU 40 UK men’s as 6.5-7, showing a slight variation. The discrepancy between UK 6.5 and UK 7 likely reflects different rounding conventions — some retailers round up, others round down.

UK women’s

Women’s EU 40 aligns to UK 7 according to Famous Footwear and Laughing Hens. Size.ly confirms UK 6-7 for women’s EU 40, placing UK 7 as the upper bound. This aligns with the standard EU-UK women’s offset of approximately 1-1.5 sizes smaller than EU. 191 cm in feet and inches converter offers additional measurement reference for cross-regional conversions.

The pattern: UK sizing runs smaller numerically than US for the same physical shoe — EU 40 men’s UK 6.5 is the most widely agreed value, while women’s EU 40 UK 7 has solid cross-verification.

Is 40 size M or L?

For clothing, EU size 40 falls in the small-to-medium range, but “M or L” depends heavily on the brand and region. The ASOS men’s shirt chart shows size 40 as a reference point, but whether it maps to medium or large varies by cut and fit preference.

Shirts

EU size 40 men’s shirts typically correspond to US medium, though some brands label it as US large. The variation comes down to vanity sizing — European brands often size down (a “medium” fits more people), while some US or international brands size up (a “medium” is roomier). For a more accurate fit, measure your chest and compare against the specific brand’s size chart rather than relying on letter sizes alone.

General apparel

Women’s clothing doesn’t use EU sizing in the same way as shoes, so there’s no clean “EU 40 = women’s US M” conversion. US women’s apparel sizing (0, 2, 4, 6… or XS, S, M, L) follows its own conventions independent of EU sizing. For dresses and tops, EU 40 may correspond to US 6-8 or S-M, but the only reliable conversion is brand-specific measurement charts. This is one area where the research found significant gaps — clothing size conversions simply aren’t as standardized as shoe size conversions globally.

The implication: for shoes, use the EU 40 conversions in this guide. For clothing, abandon the letter-size chase and measure instead.

EU to US Shoe Size Conversion Chart

Five retailers provide consistent mappings for EU 40 across genders, with variations of 0.5-1 size due to rounding and brand fit. The chart below cross-references the most reliable sources.

Size 40 Specs and Measurements

Beyond the numeric conversion, understanding the physical dimensions behind size 40 helps when shopping international brands that may not publish US equivalents.

What this means: the physical footprint of EU 40 is well-documented at 25.4 cm, making it possible to verify fit across brands even when their size labels differ.

Confirmed Facts vs. What’s Unclear

The research cross-verified multiple retailer charts, but gaps remain in specific areas — particularly around clothing conversions and brand-specific variations.

Expert Perspectives

US women’s 8 converts to a European size 40 for women’s shoe sizing.

— Size.ly (Size Guide)

Always check the specific brand’s size chart for accuracy.

— Beck Shoes (Guide Author)

Variations due to brand and last shape are common — no chart replaces actually trying the shoe or checking the brand’s specific guide.

— Zappos (Shoe Retailer)

For US shoppers ordering from European retailers, the takeaway is straightforward: men’s EU 40 maps to US 7, women’s EU 40 maps to US 9, and always verify the specific brand’s own chart before checking out.

For UK shoppers eyeing the same fit, EU size 40 typically aligns with men’s UK 6.5 or women’s 7.5, as confirmed by major retailers.

Frequently asked questions