A cup

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


1. How small is a cup size A?

Please note that this article contains affiliate links. Please see my full disclosure at the bottom of the page.

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.

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

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.
A 42C bra has more cup volume as a bra in 40C. So this woman has to go down at least one cup size. She might wanna try 42B and 42A.

front closure bra for cup a

DOBREVA Women’s Floral Lace Back Front Closure Padded Push Up Underwire Bra Plunge AA – DD cups | See Dobreva collection at Amazon.com


2. What happens with my cup size if I change the band size?

woman measuring 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.


Exclusive AAA, AA & A cups | Shop lulalu.com

Remember that bras have sister sizes. Meaning you could fit one of your siter 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 difference between cup A and cup B

Bra measuring is not difficult. But bra sizing afterwards can be tricky.


80% of women are wearing the wrong size bra
Find your fit Thirdlove's Fit Finder Quiz

Bra sizes can be very close.

Use my bra calculator to play around with your measurements a bit. It will be of great help to learn what bra sizes you can try.


4. What is the smallest bra size online?

There’s no such thing as breasts being too small. It’s what nature is all about, we come in all shapes and sizes. The cups AA or A can be the right bra size for a teenage girl, but also the cup size for a grown-up woman.

hanes bra seamless

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5. Wonderbra push-up for small cups

Now here’s a super bra brand if you’re looking for cleavage.

wonderbra push up cup a

Wonderbra Women’s Refined Glamour Triangle Underwire Push-Up Bra, A-I cups | See details at Amazon.com

The story of the Wonderbra started in 1939 in Canada when a corset company decided to manufacture bras. Nowadays the Wonderbra stands for push-up bras

billboard of hello boys campaign Wonderbra
The Hello Boys Wonderbra campaign on billboards in 1994


6. Small cup large band bras

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

cup a large band size

Glamorise Women’s Perfect Full Figure Wireless Padded Bra A Cup Only 38-58 band sizes | See details at Amazon.com

See my selection for AAA-A cups in band size 40-58


7. Bralettes for small cups

bralette for small cup

DOBREVA Women’s Lace Bralette Plunge Halter Longline Top Wirefree Bra | See collection Dobreva at Amazon.com

Bralettes are light and I always love the feeling and the look of lace all-over. This bra style is great for women with a smaller cup size. I’ve selected 8 bralettes for AAA-A cups


8. A cup bras for band sizes 28a and 30a

wingslove shelf bra cup a

Wingslove Women’s Sexy 1/2 Cup Lace Bra Balconette Mesh Underwired Demi Shelf Bra 28a-36a | See details at Amazon.com

See my selection of 10 bras for sizes 28a and 30a


9. 10 teenager sports bras | shopping guide

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

See my teenager sports bra guide for sport tops and cup-sized sports bras.


10. Bra inserts for small or sagging breasts

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.


11. swim shapers | 8 popular styles

Swimwear shapers can be lightweight pads that you tuck into the pocket of your bikini top or swimsuit. Or try this unique insert that allows air and water to pass through. See all 8 styles swim shapers


My other guides

6 reasons why small boobs deserve a fine bra
Bra calculator
Measuring guide at home
Cup AAA guide
Cup AA guide (also teens)
Mastectomy bras
Blogs on bras and more
Bras that men wear


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



Herroom Video Top 6 for Petite Ladies

  1. How To Measure Your Bra Size »
  2. Bras For Women With Small Cup Sizes »
  3. Bras For Strapless And Backless Dresses »
  4. Best Bra Styles For Deflated And Pendulous Breasts »
  5. Best Bras For The Plus Size Petite Woman »
  6. Cleavage Defined: The Hidden Truth »

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