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34A bra size — conversions, sister sizes & fit
A 34A fits an underbust of about 72.5–77.5 cm with a bust 8.75–11.25 cm larger than the band. Here is everything that label actually means — and how to check it really fits you.
Your bra size
34A US
Which measurements give 34A?
| cm | |
|---|---|
| Underbust (snug) | 72.5–77.5 |
| Bust (fullest point) | 81.25–88.75 |
| Difference (cup volume) | 8.75–11.25 |
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 34A
32B and 36AA hold a similar cup volume to 34A with a tighter or looser band. If the band of a 34A rides up, try 32B; if it digs in, try 36AA.
With this profile, fit quality is often the bigger challenge — small cups on standard bands are often cut for a rounder shape than many bodies have, so gaping at the top edge is common. Balconette and demi cuts tend to follow a shallower curve better than full-coverage styles, and a band that stays put matters more than the cup label.
34A in the Cherry Size catalogue In the Cherry Size catalogue, 449 of 617 brands have a recorded size range that includes 34A. 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 34A brand by brand34A in questions
What is 34A in European sizing?
A 34A corresponds to 75A in European sizing and 90A 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 34A big or small?
It pairs a standard or larger band with a shallower cup. Cup letters mean nothing alone: a cup only has a volume relative to its band, which is why 32B and 36AA hold a similar volume to 34A.
My 34A doesn't fit — what should I try?
If the band rides up or feels loose, go to 32B. If the band digs in while the cup is fine, go to 36AA. 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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