European (EU) Bra Size Guide & EN 13402 Metric Specification
By BraSizeChecker Editorial Guide•
Let's be incredibly honest for a moment: buying a bra is already frustrating enough without throwing international metric conversions into the mix. If you've ever fallen in love with a gorgeous piece of lingerie from a European brand, only to look at the tag and realize you have absolutely no idea what an "EU 75E" means compared to your usual size, you are not alone.
European bra sizing, which governs underwear manufacturing across Germany, France, the Netherlands, Poland, Scandinavia, Spain, and Central Europe, operates on entirely different math than what you might be used to. Based on the EN 13402 metric standard, EU sizing relies on centimeter measurements rather than imperial inches. But it's not just a simple matter of inches to centimeters—the way cup sizes progress is fundamentally different, too.
The history of bra sizing is filled with compromises, but the European system represents one of the most standardized attempts to bring mathematical sanity to garment manufacturing. When you step outside the US and UK sizing systems, the entire architecture of bra sizing shifts. You aren't just looking at different numbers on a tag; you are looking at a system engineered around two highly specific metric rules. Understanding these rules is the secret to unlocking the perfect fit across hundreds of luxury and everyday brands, from Polish full-bust specialists to exquisite Parisian lace boutiques.
If you've spent years believing you are a certain size, you need to momentarily set that aside. European sizing doesn't care about what tag you've worn your whole life; it cares about raw, precise centimeter measurements. Let's break down exactly how this metric architecture functions and why it often provides a more supportive, longer-lasting fit than its imperial counterparts. Welcome to the ultimate EU Bra Size Guide.
Shopping European Lingerie and converting French/Italian sizes
1. The Blueprint: How European (EU) Metric Sizing Actually Works
When you step outside the US and UK sizing systems, the entire architecture of bra sizing shifts. You aren't just looking at different numbers on a tag; you are looking at a system engineered around two highly specific metric rules. Understanding these rules is the secret to unlocking the perfect fit across hundreds of luxury and everyday brands.
If you've spent years believing you are a certain size, you need to momentarily set that aside. European sizing doesn't care about your US/UK size; it cares about raw, precise centimeter measurements. Let's break down exactly how this metric architecture functions.
A. EU Metric Band Numbers (EN 13402 Standard)
The cornerstone of European sizing is the band, and it is arguably the most logical part of the entire global bra sizing ecosystem. Underbust measurements taken in centimeters are mathematically rounded to the nearest multiple of 5 cm. For instance, if your ribcage underbust measures anywhere from 73 cm to 77 cm, that corresponds to an EU 75 band. This is roughly equivalent to a US/UK 34 band.
Why is this brilliant? Because unlike the archaic "+4 inch" rule that still haunts American bra sizing (where you measure 30 inches but are told to wear a 34 band), the European EN 13402 standard is rooted in literal, anatomical reality. Your band number is a direct reflection of your physical ribcage dimension.
B. The 2 cm Cup Step Increment (The Silent Culprit)
Here is where most women get completely derailed. While US and UK systems increase cup volume in 1-inch (2.54 cm) steps, European sizing increases cup letters in exact 2 cm (0.78 inch) increments.
This means every time you go up a cup letter in an EU brand, the cup is growing by a smaller amount than it would in a UK brand. In smaller cup sizes (like A, B, or C), this difference is negligible. But as you climb the alphabet (above a D or E cup), this fractional difference compounds rapidly. By the time you reach an H cup, an EU 'H' is significantly smaller in volume than a UK 'H'. This is the number one reason women with fuller busts experience "spillage" when they buy their usual cup letter from a European brand. You must anticipate this drift and often size up in the cup letter.
C. French (FR / BE / ES) +15 cm Offset
Just to keep things interesting, lingerie brands in France, Belgium, and Spain (think of iconic houses like Chantelle, Simone Pérèle, or Aubade) use the exact same cup letters as standard EU sizing, but they add a numerical offset of 15 to the band.
This means an EU 75 band is labeled as an FR 90. An EU 80 is an FR 95. The physical garment dimensions, the stretch of the elastic, and the cup volume are 100% identical—only the tag label number differs. When shopping for these exquisite French brands, never panic if the band number looks huge; it's simply a mathematical offset.
2. The Master International Band Conversion Matrix
To successfully navigate the global lingerie market, you need a reliable map. It is incredibly common for a shopper to buy a bra labeled 'EU 75E' thinking it will fit exactly like a UK 34E, only to discover the band feels incredibly restrictive or the cups are quad-boobing. The matrix below allows you to compare EU centimeter band labels directly against US/UK inch bands, French (FR) band numbers, and Australian (AU) dress sizes. Think of this as your Rosetta Stone for lingerie shopping.
A crucial piece of advice for our readers: When transitioning between systems, pay very close attention to how the band feels on the loosest hook. Because European bands don't use vanity sizing, a direct conversion might feel firmer or more rigid than a US band you are used to. This isn't a defect; it's by design. The structural support of a bra comes 80% from the band, not the shoulder straps. European engineering heavily prioritizes a secure, anchored fit around the ribcage. If you are sensitive to pressure around your ribs, you might find yourself utilizing a sister size (going up in the band and down in the cup). To explore this complex fitting technique further, you can always jump over to our Sister Size Calculator hub.
Underbust (cm)
EU Band Standard
FR / BE / ES Band
US / UK Band
AU / NZ Size
76 cm
65 cm
80 cm
30 in
Size 8
81 cm
70 cm
85 cm
32 in
Size 10
86 cm
75 cm
90 cm
34 in
Size 12
91 cm
80 cm
95 cm
36 in
Size 14
97 cm
85 cm
100 cm
38 in
Size 16
102 cm
90 cm
105 cm
40 in
Size 18
Note: If you fall between band sizes (e.g., your underbust is exactly 78 cm), your choice depends on the brand's elastic. For firmer materials, size up to an EU 80. For stretchier lace, size down to an EU 75 for better longevity.
3. Decoding the EU Cup Delta Metric Formula
Finding your cup size in the European system is an exercise in pure geometry. Forget about what cup letter you "usually" wear. In the European system, cup volume isn't an arbitrary letter; it is a strict measurement of projection. To calculate your true European cup letter in centimeters, you must determine the mathematical delta (difference) between your bust and your ribcage.
Step 1: Measure your underbust snugly. Exhale completely, and pull the soft measuring tape tight against your ribs, right where the bra band normally sits. You want the tape to mimic the firm grip of a supportive elastic band. Record this number in centimeters. Step 2: Measure your overbust at the absolute fullest point (which is usually across the nipples). Do this while wearing your best-fitting, unpadded bra, or if you prefer, braless. Ensure the tape measure is parallel to the ground all the way around your back. The tape should rest lightly against your skin, not compressing or flattening the breast tissue at all. Record this number in centimeters.
EU Cup Delta (Δ) = Overbust (cm) - Underbust (cm)
Once you have this difference in centimeters, you consult the rigorous 2 cm increment scale below. Because the EU scale moves in 2 cm steps (unlike the 2.54 cm inch steps of the UK/US), you might find your letter is higher here than elsewhere.
12 – 14 cm difference: A Cup
14 – 16 cm difference: B Cup
16 – 18 cm difference: C Cup
18 – 20 cm difference: D Cup
20 – 22 cm difference: E Cup
22 – 24 cm difference: F Cup
24 – 26 cm difference: G Cup
26 – 28 cm difference: H Cup
28 – 30 cm difference: I Cup
30 – 32 cm difference: J Cup
Troubleshooting Tip for Asymmetry and Shape: If your delta falls right on a boundary (for example, exactly 18 cm, which sits directly between a C and D cup), you are in what we call a 'borderline' or 'cusp' size. How do you choose? It comes down to breast shape. If your breast tissue is full on top, very dense, or if you have a wide root, we always recommend sizing up to the larger cup letter (in this case, a D cup). If your tissue is softer, shallow on top, or bottom-heavy, the smaller cup (C cup) will often provide a more secure, gap-free fit that lays flush against the skin. Additionally, if you have asymmetrical breasts (which is incredibly common and perfectly normal), always calculate your delta based on the larger breast to avoid painful tissue compression.
4. Take Action: Calculate & Convert Your EU Bra Size
We understand that manual math, delta calculations, and memorizing conversion matrices can be overwhelming. Trying to remember if a French brand uses the +15 offset while standing in a fitting room is frustrating. That's exactly why we built a suite of interactive, algorithm-driven tools to do the heavy lifting for you.
Whether you want to instantly convert a tag you found in a boutique, view an exhaustive cross-reference chart for international shopping, or figure out your exact sister sizes for a tricky fit adjustment, our main Hub pages have you covered. We've programmed all the EN 13402 quirks and metric nuances right into our calculators, so you can shop with absolute confidence.
We receive hundreds of questions from our community about navigating European lingerie and deciphering foreign tags. It's a steep learning curve, but once you master it, a whole new world of high-quality lingerie opens up to you. Let's address the most common roadblocks, confusions, and edge-cases you might encounter when dealing with EN 13402 metric standards, +15 offsets, and continental brand quirks. If you are ever in doubt, refer back to the exact measurements you took earlier.
How does European (EU) EN 13402 bra sizing differ from US/UK sizing?↓
European (EU) sizing follows the metric EN 13402 standard. Band numbers represent underbust measurements in centimeters rounded to the nearest multiple of 5 (e.g. 75, 80, 85). Unlike US/UK sizing which historically uses 1-inch (2.54 cm) cup increments, EU cup progressions use strictly 2 cm (0.78 inch) increments per letter step, resulting in a fundamentally different scale.
Why is a French (FR) bra band 15 cm higher than an EU band?↓
French (FR), Belgian (BE), and Spanish (ES) brands add a 15 cm numerical offset to the standard EU band number as part of their traditional sizing nomenclature (e.g. an EU 75 band is labeled FR 90; EU 80 is FR 95). The physical garment dimensions and cup letters are 100% identical to the EU standard—only the tag label number differs.
Does an EU E cup equal a UK E cup?↓
Not exactly, and this is where many shoppers get confused. Because EU sizes use 2 cm increments for cup volume and UK sizes use 1 inch (2.54 cm) increments, the scales begin to drift apart rapidly. A UK E cup is typically larger than an EU E cup. As you go up in cup size, the gap widens significantly, meaning you will almost always need to size up your cup letter when buying European brands if you have a fuller bust.
How do I measure myself accurately for EU sizes at home?↓
Take a soft measuring tape and measure your underbust snugly in centimeters directly against your skin. Then, measure your overbust at the fullest point without compressing the tissue. The difference between these two numbers in centimeters gives you your EU Cup Delta. The underbust measurement (rounded to the nearest 5) gives your EU band size.
Are Italian bra sizes the same as European standard sizes?↓
No, Italian bra sizing uses a completely different numbering system for bands, typically utilizing Roman numerals (I, II, III, IV, etc.) or standard numerals (1, 2, 3, 4). Additionally, their cup progressions can also vary significantly by brand. You should always consult a brand-specific size chart if you are purchasing luxury Italian lingerie.
Why does my European bra band feel so much tighter than my American ones?↓
The EN 13402 standard uses a direct, literal physical measurement for the band without built-in vanity sizing. Historically, many US and UK systems incorporate a '+4 inch' rule into their band naming conventions, leading to looser bands. European bands are truer to the literal underbust measurement, meaning they feel much firmer and provide superior anchor support.
I'm a 32D in US sizing. What is my European equivalent?↓
A standard US 32 band converts to a European 70 band. Since a D cup is the 4th cup letter in both systems (and the 2cm vs 1-inch discrepancy hasn't drifted too far apart yet at this cup volume), your equivalent size is most likely an EU 70D. However, if the EU brand runs shallow in the cup, you might prefer a 70E.
What should I do if my European bra cups are wrinkling at the top?↓
Wrinkling at the top of the cup generally indicates one of two things: either the cup volume is too large, or the bra is designed for someone with more 'full-on-top' breast tissue than you have. Try sizing down one cup letter, or look for 'balconette' or 'demi' styles which are better suited for bottom-heavy breast shapes.
Which European bra brands use the EN 13402 standard?↓
Major German, Polish, and Dutch manufacturers—including Triumph, Prima Donna, Chantelle, and Ewa Michalak—adhere to metric sizing, though Polish brands often combine EU band centimeter increments with narrow UK-style cup projection.
Why don't European bra sizes have double letters like DD or FF?↓
The European metric system increments purely by 2 centimeters per sequential single letter (A, B, C, D, E, F, G, H, I, J). Because each letter step is a fixed 2 cm, the system has no historical need for double letters like DD or FF to represent half-step volumes.
For years, women have silently endured the physical and emotional toll of wearing the wrong bra size. The pinching, the digging underwires, the straps that perpetually slip down your shoulders, and that inescapable feeling of restriction—it is a frustration that transcends borders. If you have ever felt a burning ache in your shoulders after a long day at work, or found deep red indentations along your ribcage the moment you take your bra off, you are intimately familiar with the struggle. This isn't just about fashion; it is about your daily comfort, your posture, and your overall well-being. Finding a bra that truly fits shouldn't feel like deciphering an ancient, unsolvable puzzle, yet the chaotic landscape of international sizing often makes it seem exactly like that.
We understand the exhaustion of ordering what you think is your size, only to have it arrive and fit completely differently from the bra you bought just weeks prior. You might be a 34DD in a US brand, but suddenly find yourself spilling out of a French 90E, or swimming in a UK 34E. It’s enough to make anyone want to give up and settle for "good enough." But you deserve better than "good enough." You deserve a garment that supports you seamlessly, distributing weight evenly across your torso rather than placing the entire burden on your delicate shoulder muscles. A well-fitted bra can alleviate chronic back pain, improve your posture, and give you the confidence to move freely throughout your day without constantly adjusting your undergarments.
This is why we have meticulously compiled this comprehensive guide and sizing matrix. We believe that knowledge is power, and by demystifying the complex world of international bra sizing, we aim to empower you to make informed, confident choices. Whether you are shopping for a delicate lace bralette from a boutique in Paris, a highly structured sports bra from the UK, or a comfortable everyday t-shirt bra from an American retailer, understanding how your measurements translate across different regional standards is the key to unlocking true comfort.
Before diving into the charts and converters, it is absolutely crucial that you start with accurate baseline measurements. If you haven't measured yourself recently—and by recently, we mean within the last six months—we strongly encourage you to visit our comprehensive How to Measure Guide. Our bodies are dynamic and constantly evolving; factors such as weight fluctuation, hormonal changes, pregnancy, and simple aging can all impact your breast tissue and ribcage dimensions. Relying on a measurement taken three years ago is a guaranteed recipe for a poor fit. Once you have your current, precise measurements in both inches and centimeters, you can use the tools provided here to seamlessly translate your size across any global standard. For a deeper understanding of how a bra should actually sit on your body, check out our Ultimate Fit Guide.
