What’s the typical bra size in the US?

That’s a tricky concern to answer, since it counts on a couple of factors such as age and also whether we’re talking natural, pre-surgery sizes just (over 400,000 females in the US had actually a breast augmentation in 2018 alone). Oh, and also not to mention that the average breast dimension in America is 34DD, but is not necessarily the same in other countries.

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This article intends to explain exactly what determines your breast size, failure the mean cup size and overall most usual breast size roughly the world, and also introduce you to the assorted bra styles that have the right to make your bust watch bigger or smaller. 

Average breast size by period (teens come adulthood)


The teenage years are a delicate, confusing time because that both boys and also girls. Girls, however, are compelled to confront a number of body-image worries as they flourish and change throughout their adolescent years. Many young women get caught up through obsessing over their looks, their weight, and also their size.

Back before everyone had actually an iphone in your pocket, us blamed the magazines and the runways. In 2019, that all around social media. Instagram stars and also influencers space abound looking ever so exquisite, yet effortless v their taut skin and hourglass curves that boast rock-hard abs, tiny waists, and also perky breasts and bottoms.

It’s no wonder teenage girls desire to emulate their so-called flawlessness if being also young come realize exactly how unattainable this type of ‘perfection’ in reality is. Those worse? Teenage bodies room hardly perfect developing. Just how a girl looks at 12, and then in ~ 15, and also then at 17 can frequently look choose three completely different women.

Although a woman’s breasts room usually fully-formed by the time she finishes puberty (which usually indicates to a 14 year old, 15, 16 or 17 year old), that’s not to say the her bra dimension then is the one she’ll wear because that the rest of her life. Breasts change size and also shape transparent life – and also even on a monthly basis, as they can swell slightly during menstruation.

It’s especially complicated to calculate the mean bra size amongst teenagers, since puberty deserve to hit in ~ wildly various times. At age 7, 15% of girl are already developing breast tissue. By period 8, that number rises come 25%. And also yet there space others who make it come 12 or 13 v no indications of breast expansion at all. That perfectly possible for one teenager to be wearing one ‘adult’ bra while plenty of of she peers room still in a maintain bra, or not needing to wear a bra in ~ all. 

Going later right into life, the median breast size among women in your 20s, 30s and 40s will be smaller than for ladies in their 50s and also beyond. That’s because of the menopause, which often tends to begin between ages 45 and also 55. It reasons a slowly of the metabolism, i beg your pardon in turn have the right to lead to load gain. According to a 2004 study, about 1 in 5 women will certainly wear a bigger bra dimension post-menopause than they did beforehand.

No one seems to have studied bra dimension by period in depth. However it seems safe to surmise that the typical size will gradually increase with period – with perhaps a spike in the twenties and early thirties, because this being when many women end up being pregnant and also see their cup size temporarily skyrocket.

Average cup size in America and also other countries:

Just as the average garments size varies approximately the world, so too perform boob size – fairly a lot! an extensive study of end 340,000 ladies measured the average cup dimension of world born in 108 countries, and found the it differed from listed below an A to above an F (US DDD). Below are some of them:

Average cup size in Australia:D
Average cup dimension in Brazil:B
Average cup size in Canada:DD
Average cup size in France:A
Average cup dimension in Germany:D
Average cup size in Ireland:D
Average cup dimension in Italy:A
Average cup size in Japan:A
Average cup size in Mexico:B
Average cup dimension in brand-new Zealand:D
Average cup size in Russia:B
Average cup size in Singapore: DDD
Average cup dimension in USA (non-Caucasian):DD

Women in southern Asia and also South-East Asia have tendency to have the smallest cup sizes. Return some nations were excluded indigenous this study, including China, throughout Japan, Singapore, Taiwan, Thailand, Malaysia, Indonesia and also Cambodia the typical cup dimension was always an A or below. Unsurprisingly, this general an ar is known for that is ultra-padded, ultra push-up bra styles!

The biggest (popular) typical cup dimension was uncovered in the USA, specifically among Caucasian women. This was the only team in the study where the mean size was above a DD.

However, it is important to note that no all boob sizes, prefer ‘D cups’ room the exact same size. A 36D is bigger than a 34D in the band and cup, and also has the exact same amount of chest tissue as a 38C. We’ve explained why in detail in the ‘sister sizing’ section of our bra size chart page.

Therefore, it’s better to look at the typical boob size in terms of volume, and not just the average cup size. Luckily, the very same study also involved measuring breast volume in milliliters.

Average Breast dimension By country (mL)


Boob size Chart


You’ll an alert for instance that the median breast volume in Ireland is significantly higher than in Germany, regardless of both countries having an median cup dimension of D. Back the study did not encompass band dimension data, this says that in Ireland, the median band dimension is larger – a 36D for example rather than a 34D. As just mentioned, ‘D cups’ room bigger when they’re top top a bigger band size.

Note that both boob size charts over are based on measurements bring away from ladies aged 28-30 only (who to be neither pregnant nor lactating, and also who had not undergone breast surgical procedure of any type of kind). For this reason although lock are very useful for comparing cup and breast sizes in between countries, they don’t necessarily stand for the average size in each nation overall.

So what is the as whole average? well according come one research of 60,000 people, the median bra size in America is a 34DD. It is up indigenous a 34B two years ago.

However, in ~ least component of the increase have the right to be meeting to much better education top top bra sizing, and also the truth that it’s far easier nowadays to find a bra in a D+ cup size. Fewer full-busted ladies today room wearing a too-small cup size by mistake, or trying to cram their breasts into one simply because nothing larger is available. And given that the mean band dimension hasn’t changed, it seems American women haven’t really acquired much bigger.

What determines your breast size?

Why perform some ladies wear a AA cup, and also others wear a GG? overall weight is a variable of food – yet then the course, there are both slim women with naturally big breasts and also plus-sized women with little ones.

As described further above, age plays a duty in determining your bra size. A mrs in her fifties or sixties is more likely to it is in full-busted 보다 a 17 year old fresh out of puberty.

Pregnancy is also a factor. Not simply lactation itself, which deserve to easily cause an (albeit temporary) rise of two to three cup sizes, or even more. But also whether you’ve been pregnant in the past – some women’s breasts stay larger after they’ve perfect breastfeeding, however many uncover that your shrink down to smaller than their pre-pregnancy size.

Mostly though, it simply depends on her genetics. Despite cases to the contrary, there space no pills you can take, cream you can use, or practice you deserve to do to boost your breast size (although structure up your pectorals muscles that sit below the breasts can make them look a tad bigger). If your mom had an especially small or big chest, or proficient a details change in cup size after having you, yes a an excellent chance you will do it follow suit.

Bra styles to make her breasts look bigger or smaller

Not happy through your natural bust size? If you’re searching for a less invasive systems than surgery, you might be surprised in ~ just exactly how much of a difference changing bra formats can make. 

Bras come make your boobs watch bigger

Molded cups – return these don’t actually include much volume, they give you a rounded shape that we have tendency to associate v the ‘fullness’ of larger breasts.

Padded bras – usually made v foam or gel, these have padding concealed away within the cup to give the impression of extra volume. Depending on how lot padding there is, you deserve to look all over from 1 come 3 cup sizes bigger.

Push up bras – a specific type of padded bra, these have the most padding in ~ the basic of the cup. Your chest tissue sit on peak of it, lifting it greater for an ext obvious cleavage.

Bras to make your boobs look smaller

Minimizer bras – particularly designed for simply this purpose, these use tall, non-stretch cups that save your chest tissue compressed, because that a flatter profile. They tend to make your bust appear about one cup size smaller.

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Bralettes – a wire-free, frequently unpadded format of bra, this offer much less lift and also a much more natural shape. Return they nothing ‘squish’ your breasts at all favor a minimizer, numerous women think your bust looks smaller in a bralette.

Bandeaus – essentially a pipe of fabric, this basic bra style doesn’t have actually separate cups or underwires. The absence of support and lightweight compression incorporate to offer your bust a slightly flatter appearance.