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30DD bra size — conversions, sister sizes & fit
A 30DD fits an underbust of about 62.5–67.5 cm with a bust 18.75–21.25 cm larger than the band. Here is everything that label actually means — and how to check it really fits you.
Your bra size
30DD US
Which measurements give 30DD?
| cm | |
|---|---|
| Underbust (snug) | 62.5–67.5 |
| Bust (fullest point) | 81.25–88.75 |
| Difference (cup volume) | 18.75–21.25 |
Between two sizes? Measurements near the edges of these ranges can also fit the neighbouring size — check the sister sizes below and, in doubt, trust the fit checks from our measuring guide.
Sister sizes of 30DD
28DDD and 32D hold a similar cup volume to 30DD with a tighter or looser band. If the band of a 30DD rides up, try 28DDD; if it digs in, try 32D.
A small underbust with a deep cup is the profile the high street serves worst: mainstream ranges often stop at D or DD on small bands. Specialist full-bust brands build specifically for this shape, with narrower wires and deeper cups that don't gape at the top. Resist sister-sizing up in the band to find stock — on a small frame, band support is everything. The projected shapes of full-bust lines will fit better than a stretched mainstream cup.
30DD in the Cherry Size catalogue In the Cherry Size catalogue, 235 of 617 brands have a recorded size range that includes 30DD. That count uses each brand's band range and largest cup (the smallest cup is not recorded) and includes ranges not yet checked. Each of them cuts it differently: the app estimates the size to try at each brand, from your own measurements.In the app, your size is free, and so is your size at 3 brands you choose. Every brand, the fitting room, the wardrobe and the journal need a subscription, with a free trial for eligible new subscribers.
See 30DD brand by brand30DD in questions
What is 30DD in European sizing?
A 30DD corresponds to 65E in European sizing and 80E in French/Spanish sizing, by the usual correspondences. The conversion changes the band numbering, and from DD up the cup letter too (US DD = EU E); individual brands can differ.
Is 30DD big or small?
It is a full-bust size on a small frame — a combination mainstream brands often skip. Cup letters mean nothing alone: a cup only has a volume relative to its band, which is why 28DDD and 32D hold a similar volume to 30DD.
My 30DD doesn't fit — what should I try?
If the band rides up or feels loose, go to 28DDD. If the band digs in while the cup is fine, go to 32D. If the cup overflows, try one cup up in the same band; if it wrinkles empty, one cup down. Two minutes with the calculator gives you a fresh estimate.
Nearby sizes
Your size, everywhere you shop
Cherry Size keeps your measurements on your iPhone, translates them into 617 brands, tracks changes through pregnancy, nursing or weight shifts (with a subscription) — and never uploads a thing. In the app, your size is free, and so is your size at 3 brands you choose. Every brand, the fitting room, the wardrobe and the journal need a subscription, with a free trial for eligible new subscribers.
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