Convert US sizes to EU, UK, and more — shoes, clothing, bras, rings, and hats
Shopping internationally has never been more common, but navigating the difference between US and European sizing systems remains one of the most confusing aspects of buying clothes and shoes online or while traveling abroad. Whether you are ordering a pair of Italian leather shoes, a French dress, or a German-made winter coat, understanding how your familiar US size translates to the EU sizing system can save you the frustration of returns, exchanges, and ill-fitting purchases. This US to EU Size Converter covers all the major clothing and accessory categories you are likely to encounter: shoes for men, women, and kids; clothing tops; jeans and bottoms; bras; rings; and hats. For each category, the converter provides not only the EU equivalent but also the UK size and additional measurements like foot length in centimeters, waist measurements, ring diameter in millimeters, and head circumference — giving you multiple data points to make the most informed decision possible. The EU sizing system differs from the US system in several important ways. For shoes, European sizes are based on the Paris point measurement system, where each size unit equals two-thirds of a centimeter of foot length. This is why EU shoe sizes appear as larger numbers (EU 40 versus US 8.5 for women, for example). The mathematical relationship between US and EU shoe sizes is consistent but differs slightly for men and women due to the historical convention that women's US sizes run 1.5 sizes larger than men's for the same foot length. For clothing, the EU sizing convention varies by country and garment type. Women's EU sizes are typically the US numeric size plus 28 to 32, depending on the garment. So a US women's size 8 top roughly corresponds to EU 38. Men's tops are labeled by chest measurement in centimeters divided by two, meaning a man with a 40-inch (102 cm) chest would wear approximately EU 50–52. Jeans present a slightly different situation, with EU pant sizes for men corresponding to the actual waist measurement in centimeters and women's jeans following a separate numeric scale. Bra sizing is particularly tricky because US and EU systems use different band size units — US bras use inches while European bras are labeled in centimeters. To convert, multiply your US band size in inches by 2.54 and round to the nearest 5 cm increment. Cup letters are mostly the same between US and EU systems, with the exception that US DD corresponds to EU E, and US DDD corresponds to EU F. This converter handles both the band and cup conversion automatically. Ring sizes in the EU system are based on the inner circumference of the ring in millimeters. US ring sizes use a numerical scale starting from size 3, and this tool provides the EU size (circumference in mm), the UK letter-based size, and the inner diameter in millimeters to help you verify with a jeweler. Hat sizes across the Atlantic differ in that US hat sizes are often fractional (7, 7⅛, 7¼) based on head circumference in inches divided by pi, while EU hat sizes use the head circumference in centimeters directly. This makes converting straightforward: multiply your US hat size by pi (approximately 3.14159) and multiply by 2.54 to get the circumference in centimeters. One critical caveat applies to all size conversions: these are standard reference sizes based on industry conventions. Individual brands — especially premium and luxury labels — often deviate from standard sizing tables. Athletic brands like Nike and Adidas may run a half-size different from standard EU charts. Luxury fashion houses frequently use their own proprietary sizing. When shopping for an unfamiliar brand, always consult the brand's own size guide in addition to this converter. For the most accurate shoe fit, measure your feet in the evening when they are at their largest, as feet swell slightly throughout the day.
Understanding US and EU Sizing Systems
What Are EU Sizes?
European (EU) sizes are a standardized system for measuring clothing and footwear used across continental Europe. For shoes, EU sizes are based on the Paris point system, where each size represents two-thirds of a centimeter of inner shoe length. This means EU shoe sizes count up faster than US sizes — EU 40 for women corresponds roughly to US 8.5, and EU 44 for men corresponds to US 11. For clothing, EU numeric sizes for women are typically the bust or hip measurement in centimeters minus a constant (often 80 for tops). Men's EU shirt sizes correspond to collar or chest measurements. EU sizes are widely used in France, Germany, Italy, Spain, the Netherlands, and other European countries, although within Europe there can be slight regional variations in how the numbers are applied, particularly for women's clothing.
How Are Sizes Converted?
Shoe size conversion uses a consistent mathematical relationship: EU size = (3/2) × foot length in cm + 2. Since men's and women's US sizes use different offsets from foot length, the conversion tables differ by gender. Women's US sizes translate to EU sizes that are roughly 30–31 more (US 8 ≈ EU 38–39). Men's US sizes translate to EU sizes that are roughly 33–34 more (US 10 ≈ EU 43). For clothing tops, EU women's sizes are typically the US numeric size plus 28–30 (US 8 = EU 38). Men's EU sizes map to chest measurement ranges. For jeans, women's EU sizes follow their own scale while men's EU pants often equal waist size in centimeters. Bra bands convert by multiplying US inches by 2.54 and rounding to the nearest 5 cm. Ring sizes convert by looking up the inner circumference in millimeters. Hat sizes convert via head circumference: US size × π × 2.54 = circumference in cm.
Why Accurate Size Conversion Matters
Getting the right size when shopping internationally saves both time and money. Returns and exchanges for online international purchases can be expensive and complicated — some international retailers do not accept returns at all, or the cost of shipping items back across borders exceeds the item's value. Wearing the wrong shoe size even slightly can cause discomfort, blisters, and long-term foot problems. Ill-fitting clothing not only looks poor but can affect your confidence and comfort. For special occasions — a wedding, a job interview, a formal event abroad — having accurately sized clothing and accessories is essential. Even for everyday purchases, knowing your EU size means you can shop confidently in European stores and international online shops, taking advantage of better prices, exclusive styles, or higher quality items not available domestically.
Limitations and Brand Variations
Size conversion tables are based on standard industry measurements, but real-world sizing varies significantly across brands, countries, and even between product lines from the same brand. Athletic brands like Nike, Adidas, New Balance, and Converse each have their own sizing quirks — some run small, some run large, and some differ between their running shoes and casual shoes. Luxury fashion houses such as Gucci, Prada, and Louis Vuitton often use proprietary size charts that deviate from standard EU sizes. Italian sizing in particular tends to run smaller than German or Scandinavian sizing even within the EU system. For clothing, fabric type matters: stretchy knit fabrics are more forgiving than structured woven fabrics, so you may need to size up in woven styles. Vanity sizing — the practice of labeling clothes with smaller numbers than the actual measurements — is more prevalent in US fashion than European fashion, which is one reason a US size 10 often corresponds to EU 38 or 40 rather than a perfectly scaled equivalent.
如何使用此转换器
Choose a Size Category
Select the category that matches what you are shopping for: Shoes, Tops, Jeans/Bottoms, Bra, Ring, or Hat. Each category has its own sizing system and conversion table.
Select Gender (if applicable)
For shoes, tops, and jeans, choose Men, Women, or Kids (shoes only). The available US sizes and conversion tables change based on your selection.
Pick Your US Size
Use the dropdown to select your US size. For shoes, you can also tap one of the quick-pick popular size buttons. The EU equivalent and additional measurements appear instantly.
Note the EU Size and Extras
Your EU size appears as the main result. Secondary results show the UK size, foot length in CM (shoes), waist measurement (jeans), ring diameter (rings), or head circumference (hats). Use the Copy button to save all results at once.
常见问题
What is EU size 40 in US women's shoes?
EU 40 corresponds to approximately US 9 to 9.5 in women's shoes, depending on the brand. The standard conversion shows US 9 as EU 39–40 and US 9.5 as EU 40. If you are between sizes, most shoe experts recommend sizing up to EU 40 for a more comfortable fit, especially in leather or structured styles that may not stretch. For athletic shoes, some brands like Nike or Adidas may run half a size smaller, so you might find that a US 9 fits better in an EU 40 than a 39 in those brands.
Is EU 38 a US women's size 8?
EU 38 corresponds to US women's size 7.5 to 8. Specifically, US 7.5 converts to EU 38 and US 8 converts to EU 38–39 depending on the brand. This is one of the most common size ranges for women's shoes globally, so it is well-stocked in most European stores. If you find that EU 38 is slightly snug, EU 39 will typically correspond to US 8.5. The fit can vary by the style of the shoe — a pointed-toe shoe may feel smaller than a round-toe at the same EU size.
How do I convert my US clothing size to European?
For women's clothing tops, add approximately 30 to your US numeric size to get the EU size. So US size 8 becomes EU 38, US size 10 becomes EU 40, and US size 12 becomes EU 42. However, this is a guideline — EU sizing varies by country and brand. French sizes tend to match the general EU chart, while Italian sizes may run smaller. For men's clothing, EU sizes correspond to chest measurements in centimeters, so a man who wears a US Large (chest 40–42 inches) would wear EU 50–52. Always check the brand's size chart alongside this converter for the most accurate fit.
How do bra sizes convert from US to EU?
US bra band sizes are measured in inches, while EU band sizes are in centimeters. To convert, multiply the US band size by 2.54 and round to the nearest 5 cm increment: US 34 × 2.54 = 86.4 cm → EU 85. For cup sizes, most letters stay the same between US and EU, with two exceptions: US DD becomes EU E, and US DDD (or F) becomes EU F. So a US 34DD would convert to approximately EU 75E. Within Europe, there are further variations: UK bras use a different cup progression with half-cup sizes, and French, German, and Scandinavian brands may use slightly different band rounding conventions.
Why do US and EU shoe sizes differ so much?
US and EU shoe sizes are based on entirely different measurement systems developed historically in different countries. EU sizes use the Paris point system (each unit = 2/3 cm of foot length), while US sizes are based on barleycorn measurements (each unit = 1/3 inch). Additionally, US men's and women's sizes are offset from each other by 1.5 sizes, meaning a woman with the same foot length as a man wears a US size 1.5 larger. This is why conversions between the two systems require lookup tables rather than a simple formula for all genders — though the mathematical relationship exists, the starting points and offsets differ.
Should I size up or down when converting US to EU?
The answer depends on the category. For shoes, if you are between EU sizes, most experts recommend sizing up, especially for closed-toe shoes and leather styles that do not stretch much. For clothing tops and jeans, EU sizes tend to be sized more precisely to body measurements, so if you are between sizes, sizing up gives a more comfortable European-style fit. US clothing often uses stretchy fabrics and looser cuts, so the EU equivalent may feel slightly more structured. For rings, size up if you are between sizes — you can always have a ring resized smaller more easily than larger. For hats, size up if you are between sizes for a comfortable fit that does not squeeze.