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Small bra sizes | How to measure a small cup?

I meet women who wear a cup A who’d be better off with an AAA or AA cup. But it can also be that they might need a B or C cup bra. That’s how close sizes can be.

  • What are the small bra sizes?
  • How do I measure my bra size for small breasts?
  • Will my bra size change over time?
More than one bra size may fit you just fine


What are the small bra sizes?

What I do know about small cups is the fact that most lingerie stores do not sell the smallest cup sizes and therefore cannot possibly give proper advice. Maybe you end up with a cup A that is too big for you. Or you might not visit a lingerie store in the first place because you feel you don’t belong there.

As we keep reading and hearing all around us is the fact that more than half of us do not wear their right bra size. Percentages can be different but vary from 60 to 80 percent.

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I always found these percentages a bit high. But I know now their not. I discovered my own new bra size (after wearing wrong sized bras for decades).

Having small breasts we have a disadvantage of the simple fact the smallest cups are not available in most (online) stores. But, thank god there’s the internet (well, for us petite surely a good thing).

The smallest cup sizes you’ll find are AAAA, AAA, AA, and A. Read more about the smallest bra size online »

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How do I measure my bra size for small breasts?

It is not hard, and only human, to go along with something that is no longer good for you. Like a bad-fitted bra. It happens to women with all bra sizes, whether you are a plus size, medium, or a petite breasted woman.

I see it with women friends of mine. Of the first four women I measured, three of them were not wearing their right bra size. They felt it already and saw their bad-fitted bra in the mirror every day.

woman holding measuring tape


If you have small breasts measuring yourself is done the same way women of all sizes do. The thing is. Many women stick with their bad-fitted A cup while they think this is the best they can get. Isn’t a cup A the smallest already? Well, no we know now it’s not.

I advise every woman to measure herself at home if she has doubts about her current bra size. Read all the bra measure tips you’ll need to take your measurements. Or watch this video by Herroom.com on how to measure our breast size.

4:26 minute video Measure your bra size

Herroom has a wonderful collection of petite bras, starting from cup AA. With brands like The Little Bra Company, Calvin Klein, Wacoal, and Timpa | See petite bra collection at Herroom.com


Of course, it’s ok to do a bra fitting in a store or let a friend help you. But even then I encourage you to write down your own measurements. Why?

I developed the bra calculator because I want to make women play around a bit with their measurements. You’ll notice that you might fit another size as well. This will make you doubt what size to try. And that’s a good thing.

As for any woman, we all might fit more than one bra size. This is because our bra size has sister bra sizes. Sister bras have the same cup volume, even though their cup size and band size are named differently.

For example:

  • a bra in 34B has the same cup volume as a bra in 36A
  • a bra in 38AA has the same cup volume as a bra in 36A

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Will my bra size change over time?

Many women need different bra sizes during their lives. There are many causes that may or will change our body and our breasts.

  • When going up a band size your cup size volume will automatically be bigger as well. To keep the same cup volume you will have to go down a cup size.
  • When going down a band size your cup size will automatically have less volume. To keep the same cup volume you will have to go up a cup size

It’s important to measure precisely. Only a slight change in measurements can change your bra size altogether. And because our body sizes may change during life, it is wise to measure on a regular base.

Especially women with smaller busts may never have had the right bra size before. So measuring yourself is the best thing you can do for yourself. Only a well-fitted bra will turn a woman into a bra lover.

Wink Gal Women’s Stretch Wireless Padded Removable Cups Cotton Bralette A-C cups See details at Amazon.com

There really is only one way to find out what your best bra size is.

  • measure your cup size and band size
  • check your sizes in the bra size calculator
  • dare to try different sizes, especially if you know or think you’re in between two sizes.


Go to bra size calculator and determine your best bra size


Amazon AA cup bras »


Amazon A cup bras »


Amazon B cup bras »


Amazon C cup bras »


Video Top 10 for petite ladies by Herroom

How To Measure Your Bra Size
Bras For Women With Small Cup Sizes
Bras For Strapless And Backless Dresses
Best Bra Styles For Deflated And Pendulous Breasts
Best Bras For The Plus Size Petite Woman
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