Bra Size Converter

Bra sizing combines a band measurement around the ribcage with a cup letter that reflects the difference between bust and band. US, UK, EU, and Australian systems use the same basic idea but label bands and cups differently, which creates confusion when ordering lingerie from overseas brands. A UK 34DD is not the same label as a US 34DD because cup progressions diverge after certain letters.

International shopping for bras has grown with direct-to-consumer brands shipping worldwide, but return rates stay high when shoppers assume their home label translates directly. EU band sizes are often expressed as the underbust measurement in centimeters, while US and UK bands use inches with a different offset formula. Cup letters that look identical across systems can represent different volume once band sizes change in sister-sizing logic.

Proper fit affects comfort, posture, and garment drape more than most people realize. The band should provide most of the support, sitting level around the torso without riding up in back. Cups should encapsulate tissue without spillage or gaping at the top. Weight fluctuation, hormonal cycles, and athletic training all shift measurements, so a size that worked last year may need re-evaluation.

Professional fittings in stores remain valuable, but knowing how to convert your measured band and bust difference into multiple regional labels helps when your preferred style only ships from abroad. Sports bras and bralette sizing often use simplified S/M/L charts that do not map cleanly to structured bra sizes, so check each brand's guide separately.

Use this converter when comparing UK heritage brands to US department store labels, shopping AU swimwear with bra-sized tops, or helping friends abroad exchange sizing advice. Understanding regional cup progressions reduces returns and makes international lingerie shopping far less frustrating.