Average Breast Size Statistics [New Data]

This article is a summation of a dataset that covers the average breast size and other interesting breast and bra size statistics from around the world.

The dataset covers more than 15,000 international measurements and +5,500 survey responses. Hopefully, the data helps break down biases around breast sizes, such as comparing the actual average breast size with what people report to think the average breast size of the population in different countries is.

Here’s what we’ve covered:

• Average Breast Size, by country
• Average US Breast Size
• Global Average Breast Size
• Average Breast Size, by age
• Ideal Breast Sizes
• Cup Size Preferences, by Gender
• Ideal Bra Size Versus Most Common Bra Size, by country
• Are You Satisfied With Your Breast Size?

Key Takeaways

• Norway has the biggest average bra sizes in the world with a 38D.
• 40C is the average cup size in the US.
• The global breast size average is 32A.
• The global average breasts weighs in at around 0.5 kg.
• Over 50% of men and women prefer a breast size that fits in a C cup.
• Men generally report to like smaller (below B cup size) and larger (over C cup size) boobs better, whereas women prefer average cup sizes, B and C cups, more than men.
• Over 20% of women report that they are not satisfied with their breast size.
• 70% of men report being satisfied with their partners’ breast size.
• 11% of men report to prefer small breasts, while 35% report to prefer large boobs.
• The bra size increases from an average A size at age 12, to a B size at age 13-14, while fully developed to cup size C+ at age 16 for US women.

Average Breast Size, by country

In the below table, we have sorted based on cup size, as this is typically what people refer to when measuring breast sizes. However, some issues arise with this, as we will address in later tabulations.

Cup Size and Weight of Breasts

To measure the weight of breasts in the dataset based on cup size alone we have taken the average band size of 32. The normal breast sizes run from A to E. Meanwhile, there are three other scientific categories for breast sizes:

1. The larger end of the Normal Spectrum – GG too JJ cup size (with 32 bands)
2. Macromastia – K to L cup size (with 32 bands)
3. Gigantomastia – LL to NN cup size (with 32 bands)

Average US Breast Size

What the above tabulation shows is that the average US breast size is a C cup.

Measured in other ways the average US breast size is 40C (when including band size), which equates to 3.3 lb breasts or 52 cu in.

Global Average Breast Size

What we also see from the dataset is that the world’s average breast size fits in a bra with a 32-34 size band and an A cup. The global average breast weighs in at around 0.5 kg

Average Breast Size, by age

• Age 13: Breast size B
• Age 14: Breast size B
• Age 15: Breast size C
• Age 16: Breast size C+, at this age girls on average have fully developed breasts
• At age 50: Breast size increases on average due to menopause.

Ideal Breast Sizes

To better understand the statistics, biases, and opinions about breast sizes we choose to include data on preferences and people’s understanding of breast sizes.

This will help both explain the biases that contribute to insecurities or can account for

For Men

When asking men, if they prefer small, medium, or large breasts the answers are distributed as follows:

• 11.0% of men report that they prefer small breasts.
• 53.6% of men report that they prefer medium/average-sized breasts.
• 35.3% of men report that they prefer Large sized breasts

For Women

When asking women, if they prefer small, medium, or large breasts the answers are distributed as follows:

• 9.1% of women report that they prefer small breasts.
• 60.4% of women report that they prefer medium/average-sized breasts.
• 30.5% of women report that they prefer Large sized breasts

Comparing Men and Women

While 11% of men prefer small breasts, only 9% of women prefer the same. Conversely, 35% of men report to prefer Large breasts, while 31% of women prefer large breasts.

Overall, the preferences between genders are very similar, meaning that both genders have a bias towards larger breasts.

This does, however, not mean, that the reported average breast size is not a size that is actually unhinged from reality. It is very likely that due to human biases people believe the average breast size is different than the actual average.

Cup Size Preferences, by Gender

Instead of asking about small, average, or large we gathered data on respondents answers to questions about specific cup size preferences.

Below are the results per gender:

The results are clear:

• Over 50% report that they prefer a C cup sized breasts.
• Compared to women, men generally report to like smaller (below B cup size) and larger (over C cup size) boobs better, whereas women prefer B and C cup sizes more than men.

Ideal Bra Size Versus Most Common Bra Size, by country

Here is a side by side comparison of the reported ideal cup size and the average cup size for each country in the dataset.

Please do remember, that cup size are not necessarily an accurate or optimal measure of actual breast size.

Are You Satisfied With Your Breast Size?

We asked both people with breasts about their satisfaction with their own breast size, and additionally about if they were satisfied with their partners breast size.