What are the sister sizes of 34DD?

32DDD and 36D — same cup volume, different band.

Is 34DD the same in every brand?

No. A 34DD can fit differently between brands because of pattern, fabric and cup shape. Use it as a starting point and try a sister size when switching brands.

34DD bra size — conversion chart, sister sizes & brands

A 34DD bra (US notation) in every regional standard. The same band-and-cup, labelled eight different ways.

US	UK	EU	FR	IT	AU	JP	IN
34DD	34DD	75E	90E	75E	12DD	75E	34DD

Band conversions are exact; cup fit still varies by brand, style, and body — a conversion is a starting point, not a guarantee.

Sister sizes of 34DD

Sister sizes hold the same cup volume with a different band — the quickest fix when a band feels too tight or too loose.

32DDD 36D

Not sure you're a 34DD? Two measurements, two minutes — free, nothing stored.

Check my size →

Brands that make DD-cup bras

34DD FAQ

What is 34DD in EU sizing?: 34DD (US) is EU 75E. In UK sizing it is 34DD. Band conversions are exact; cup fit still varies by brand, style, and body — a conversion is a starting point, not a guarantee.
What are the sister sizes of 34DD?: 32DDD and 36D — same cup volume, different band.
Is 34DD the same in every brand?: No. A 34DD can fit differently between brands because of pattern, fabric and cup shape. Use it as a starting point and try a sister size when switching brands.