A cup

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Cup A is the slightly bigger sister of AAA and AA. This guide is all about A-sized ladies. Enjoy!

woman in cup a classic bra thirdlove

24/7® Classic T-Shirt Bra | A – H cup | See Thirdlove.com


1. How small is cup size A?

Bras come in different band sizes and in different cup volumes. Cup size A is one of the smaller cup sizes available. Other small cups are AAA and AA (also Teens).

A teenager’s first bra can be a cup A. But a grown-up woman can also have a cup A (or smaller).


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See my bra calculator or shop for bras at:

Lulalu Bras | Women's AAA-A cups »

HerRoom | Training and teen bras »

ThirdLove | Asymmetric Breasts »


Lulalu bras for women with AAA, AA, A cups | bands 30-42 | See Lulalu.com


Bra sizes can be very close. And you cannot just say cup A is smaller than cup B.

For example.

✔ a woman is wearing a 40C bra. She is not happy with the cups, they are too big and she finds the band size a bit too tight.
✔ going up a band size would be a 42 band. When going up a band size the cup volume will automatically change too.
✔ 42C bra has more cup volume than bra 40C. So this woman has to go down at least one cup size. She might wanna try 42B and 42A.


2. Changing your bra band size

woman holding measuring tape for bra size


I own bras in 3 different sizes ( 34AA, 34A, and 36AAA – and they all fit me just fine. Depending on the type of bra and the brand I choose different sizes.

Remember that bras have sister sizes.

Especially if you’re in between two possible band sizes you could well have different cup sizes that fit you just fine. For example, a bra 80A has the same cup volume as a bra 75B.


3. The smallest bra size online

woman wearing smallest cup size


There’s no such thing as breasts being too small.

Cup A sure isn’t the only small cup bra on the market. There are also cup AA and cup AAA read more about the smallest cups


4. Wonderbra push-ups

wonderbra push up


Now here’s a super bra brand if you’re looking for cleavage. Great on A cups

The story of the Wonderbra started in 1939 in Canada when a corset company decided to manufacture bras.


5. Small cup large band bras


No woman is the same and having smaller boobs does not necessarily mean your underbust size is also small.

See my selection for AAA-A cups in band sizes 40-54


6. Bralettes for small cups

woman wearing cup a bralette


Bralettes give only light support. A basic black design is always a good choice. And I do like the look and feel of a lace bralette.

This bra style is great on A-cup-sized women. I’ve selected 8 bralettes for AA-A cups


7. Bras 28a and 30a

woman wearing natori bra 28a


Small bust small frame bras for women. See my selection of 10 bras for sizes 28a and 30a


8. Teenager sports bras

two teenage sports bras blue and grey


Every teenage girl has her own body proportions. Girls of the same age may have a totally different size.

See my selection of bralette style, racerback, and cup-sized sports bras 10 Teenager sports bras


9. Bra inserts for small chest


Bra pads are little lifesavers really. And they come cheap. Add them in whatever you like. 

These 8 bra inserts work great for just some padding, a little extra cleavage, or for balancing uneven breasts.


10. Swim shapers

set of swim shapers


Swimsuit pad inserts are a great replacement for your original pads. You might not want to increase your size and keep it modest.

But if you do look for a little or bigger boost, it’s just that easy. See 8 Swim Shapers


11. Silk bras

woman wearing silk bra suitable for cup a


A silk bra matches very well with smaller cups, like A or B. Silk is gentle on the skin. If you once tried it… See 8 Silk Bras


My other guides

Bra calculator
6 Reasons Petites deserve a fine bra
Measure smaller breasts
Cup AAA guide
Cup AA guide (also teens)
Mastectomy bras
Bra Accessories
Blog on bras and more


Is there a question about your bra still unanswered? Please let me know. I’ll be happy to advise.


Lulalu Bras for women with AAA, AA, A cups | bands 30-42 | See Lulalu.com



Her Room Banner

See my bra calculator or shop for bras at:

Lulalu Bras | Women's AAA-A cups »

HerRoom | Training and teen bras »

ThirdLove | Asymmetric Breasts »