Complete Guide to International Lingerie Sizing

Let’s be real—figuring out lingerie sizes across countries? Super confusing. One minute you’re a 34B in the US, the next you’re an entirely different animal in Europe. If you’ve ever ordered online from a UK brand and ended up with a cup that looks more like a teacup than a support system, you're not alone.

I've been reviewing lingerie for over 8 years, tested 200+ brands globally, and let me tell you: the biggest mistake shoppers make is assuming sizing is universal. Spoiler: it’s not. But don’t sweat it—I’ve broken down exactly how international lingerie sizing works, complete with hard data and a handy conversion table.

Why Lingerie Sizes Vary Around the World

The root of the confusion? Different measurement systems and branding standards. The U.S. and U.K. use inches, while most of Europe uses centimeters. Also, bra size conversion isn’t always linear—some brands 'size up' their bands for comfort (looking at you, French brands), while others run tight.

According to a 2023 study by Intimate Apparel Today, 68% of women wear the wrong bra size, and cross-border shopping bumps that number even higher. Yikes.

U.S. vs. U.K. vs. EU: The Real Deal

Here's the golden rule: band sizes differ, but cup sizes grow consistently. A B cup in the U.S. is the same volume as a B in the U.K.—but the band? Totally different numbering.

Check this breakdown:

Notice the pattern? European sizes (except Germany) = band inches × 2.5, rounded. So 34 × 2.5 = 85. Germany subtracts 5 from that number—hence 80.

Cup sizes stay consistent per letter, but watch out for vanity sizing. For example, a 'D' in the U.S. may fit like a 'DD' in Australia due to brand-specific grading.

Pro Tips for Shopping Across Borders

• Always measure yourself using the European method: snug tape under bust for band, fullest part for bust. Subtract to find cup size (each inch = one cup step).
• Check the brand’s country of origin. A Swedish brand likely follows EU standards.
• Read reviews. If multiple people say “runs large,” size down.
• Use our free international bra size calculator tool to convert instantly.

Bottom line: don’t guess your size. With the right info, you can rock that French lace set or Japanese molded cup with zero stress. Stay measured, friends.