Cherry SizeCalculator › All bra sizes, size by size › 34A
34A bra size — conversions, sister sizes & fit
A 34A fits an underbust of about 73–77 cm with a bust 9–11 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) | 73–77 |
| Bust (fullest point) | 82–88 |
| Difference (cup volume) | 9–11 |
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 the same cup volume as 34A with a tighter or looser band. If the band of a 34A rides up, try 32B; if it digs in, try 36AA.
This is one of the easiest profiles to shop: nearly every brand carries it. Your bigger risk is fit quality rather than availability — 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.
Who makes 34A? 406 of the 632 brands in the Cherry Size catalogue are confirmed to carry 34A in their standard range. But each of them cuts it differently — the app tells you the exact size to try at every one of them, from your own measurements.
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. The cup volume is identical — only the band numbering changes between systems.
Is 34A big or small?
It is a common band with a shallower cup — widely stocked and easy to find. Cup letters mean nothing alone: a cup only has a volume relative to its band, which is why 32B and 36AA hold exactly the same volume as 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 confirms it.
Nearby sizes
Your size, everywhere you shop
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