Average Breast Size: Statistics on Breast and Cup Sizes by Country, Age, and BMI (Height and Weight)

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 average breast size of the population in different countries is. We hope that many more will use this dataset and uncover interesting and new findings.

Please reach out to contact@bedbible.com to gain access to the full dataset. When publishing any mediums online that have made use of this dataset please make sure to reference it and this article. This applies to any use case, quote or reiteration of any points, insights, or data.

Key statistics

• Norway have 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 an 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 to be 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 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 arrise 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 too E. Meanwhile there are three other scientific categories for breast sizes:

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

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 a 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 breasts 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 increase on average due to menopause.

Ideal breast sizes

To better understand the statistics, biases, and the opinions about breast sizes we choose to include data on preferences and peoples 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 breast 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 breast 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 countries

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.

How does breast size and waist size correlate?

Waist to height ratio

Breast volume to Waist/Height-Ratio

Breast size in proportion to relative frame by % of body mass – Breast size index

Breast size hypertrophy

Average breast size total calculations

Bra size conversion table

Band size converter

Cup size calculator

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