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What Is The Average Bra Size For A Teenager? (Explained!)

Finding the right bra size for your teenager can be daunting, especially if your first time shopping for one. Like other parts of the body, breasts vary in size depending on factors such as age, weight, and genetics.

What Is The Average Bra Size For A Teenager?

The average bra size for a teenager can vary depending on various factors, including genetics, body weight, and overall development. While there is no one-size-fits-all answer, studies suggest that the average bra size for teenage girls in the United States is around a 34B.

A teenage girl’s average bra size is tough to calculate because puberty can occur at different times. While some girls can start developing breasts from age 8, older teens might be without any signs of breast development. The only way to figure out the right size is by taking measurements of the bust and the rib cage.

At age 8, 25% of girls are already developing breast tissue. At the same time, other girls might be 12 or 13 without any signs of breast development. Most women will have fully developed adult breasts by their early 20’s. A teen can be wearing an ‘adult’ bra while many of her peers are still in training bras or don’t even wear a bra.

This article will delve deep into the most appropriate bra sizes by age and how the sizes vary in different countries. We will also answer some of the buzzing questions around this topic.

Breast Development Stages

Prepubescent stage: This stage starts from age eight and goes to 12 years. At this stage, only the tip of the nipple is elevated. Because every woman’s body is different, the range varies. You don’t need a bra for support at this stage, so a training bra, triangle bra, or bralette is fine.

Early Puberty: A year or so later, the breast bud forms; that’s why the stage of development is known as “budding.” The areola expands and gets a bit larger. Training bras can still be helpful, but you can also start looking into the smallest bra sizes, such as AA or A.

Puberty: Once your teen has started puberty, she will start getting larger breasts with a further widening of the areola. Now it’s time to start measuring her chest and bust in order to buy the correct cup and bra size and get the proper support.

Young Adult: Most women will have fully developed adult breasts by their early 20’s. Your bra size can still change in her lifetime due to hormonal fluctuations (pregnancy or menopause) as well as weight changes. Many women tend to wear the wrong size bra, so it’s always a good idea to have your bra measurements retaken every few years to ensure you’re wearing the correct bra size.

❤️ Suggested reading Guide To Buying First Bras For Teenagers

The Average Bra Size by Age: 12 to 18 Years Old

The Average Bra Size by Age 12 to 18 Years Old

Bra sizes change as your teenager grows; therefore, it is not a one-size-fits-all situation. But, you can find an appropriate size for specific ages for a start, then figure out the exact true size for your girl.

What Is The Average Bra Size For A 12 Year Old

When it comes to the average cup size, most 12-year olds fit into an A or B cup comfortably. Your 12-year old could wear a bra size in the 30 to 32 range.

12-year olds wearing an A cup might quickly move to a B cup as they’re developing rapidly at this age.

So if she’s of average weight and height she may find a 30A to 32B bra fits her best.

One should be aware that the topic of 12 year old boobs and what constitutes the average or normal breast size for a 12 year old can be a sensitive subject. It’s essential to remember that every girl develops at her own unique rate, and there’s a broad spectrum of what’s considered “normal.”

When parents and guardians search for “what is the average bra size for a 12 year old,” they should be aware that many factors influence this, including genetics and overall physical development.

The average breast size for 12-13 year old girls is often in the beginning stages of development and may fit into training bras or smaller cup sizes. Yet, some 12 year olds might require a more substantial cup size.

It’s paramount to focus on ensuring that the young girl feels comfortable and confident in her body, irrespective of her chest size.

❤️Suggested reading: Should A Teenager Wear A Bra To Bed?

What Is The Average Bra Size For A 13 Year Old

The average cup size for 13 year old girls depends on their overal stature and development.

At 13, your teenager will fall under the A cup if she is of smaller stature or a B cup if she is a little bigger than her peers. Another thing to consider is that if puberty started earlier for your teenager, they might fit a bigger bra at 13 than those whose puberty started later.

Generally, a 13-year old girl will fit into a size between 32A and 34B. A few will get a comfortable bra in size 34C, especially if they developed earlier or are heavier than their peers.

So if she’s of average weight and height she may find a 32A to 34B bra fits her best.

It is important to note that the size can change within their 13th year depending on how fast they develop.

What Is The Average Bra Size For A 14 Year Old

Teenagers around 14 will fit into a B cup bra comfortably. But like others, the right size will depend on the weight, general stature, and rate of development during puberty. Therefore, some can still fit into an A cup while others stretch to a C cup.

So if she’s of average weight and height she may find a 32B to 34C bra fits her best.

At 14, your teenager is at the peak of development; therefore, the bra size can change quickly before hitting their 15th year. This is why it is important to get the right size by calculating the band and the bust measurement.

While some statistics might suggest certain averages, the range can span from smaller cup sizes to the biggest bra size for a 14 year old, which can be well beyond a D cup.

The average cup size for 14 might vary across populations, but it’s generally within the A to D range. However, defining a normal breast size for 14 year old or a normal bra size for 14 year old is subjective due to individual differences.

What’s paramount is ensuring each young teen wears a bra that offers comfort, proper support, and boosts their self-confidence.

What Is The Average Bra Size For A 15 Year Old

It is common for 15-years olds to have big breasts, stretching to cup DD, but most of them fall in the B and C cups. If your 15-year old teenager is petite, she may still fit a cup A, but the band size may change as she grows or gains weight.

Again, there is no average chest size of a 15 year girl, as many factors play a role. But as a guide, stick to the A cup if your teen has a small stature, B if she is of average weight and height, and C if she is generally bigger than girls her age.

So if she’s of average weight and height she may find a 34B to 36C bra fits her best.

The band can go from as small as 30 and as big as 36 for 15-years old. So the only way to get the right size is to measure the band and the bust. Equally, trying a few teen bras within this range can help you get the best fitting bra for your 15-year old.

What Is The Average Bra Size For A 16 Year Old

16-year-old teenagers fall in various sizes when it comes to bras. They can fit as small as 30A bras to as big as 36D bras. The exact size will depend on the chest size and the size of the breasts, so she can fall anywhere inbetween these sizes.

If your 16 year old is of average weight and height she may find a 34B to 36D bra fits her best.

Teens in the 30A size are usually more petite in size, and in most cases, their development starts later into puberty. Some remain in the smaller sizes for years, while others last just a few months, depending on their development rate.

It is also considered ‘normal’ for a 16-year old teen to fit into a D-cup bra. Older teens generally have fuller breasts requiring a more accommodative cup for a comfortable fit. Depending on the teen’s weight, the band size can be as small as 30 or as big as 36.

What Is The Average Bra Size For A 17 Year Old

At 17, your teen girl is almost fully developed; therefore, their breast may have reached the average breast size. The most common bra size for 17-year old girls is a C-cup.

If she’s of average weight and height she may find a bra size of 34B to 36DD fits her best.

The breasts at this age are fuller; however, some may still have smaller boobs that fit in A-cup and B-cup bra sizes. On the same note, some girls with larger chest sizes may fit into E-cup and F-cup bras, especially if they developed earlier and are generally heavier.

What Is The Average Bra Size For An 18 Year Old

Girls at 18 will fall under bra sizes between 32 to 36. The cup can range from a B-cup for petite girls to an F-cup for plumper ones.

The best way to find a properly fitting bra for your 18-year old is to get measurements at the store. Your girl may have a relatively smaller band, but her breasts may be fuller, requiring a bigger cup for a comfortable fit.

The Average Breast Size Chart By Age

As mentioned, weight plays a significant role in the size of breasts. But, it is not directly related to the size of bra one wears. Some girls will weigh more than others but still wear smaller bras than their petite counterparts.

Here is a teenage bra size chart describing the range of breast sizes for age. You can use this chart to get an idea of where your teen lies, helping you to choose a more appropriate bra.

Remember that measuring your band and bust size is the best way to calculate what your teen’s bra size should be. A well-fitting bra can prevent breast discomfort, back pain, and shoulder pain.

Teenager Bra Size Chart

AgeAverage Teen Bra Size
12 years30A – 32B
13 years32A – 34B
14 years32B – 34C
15 years34B – 36C
16 years34B – 36D
17 years34B -36 DD
18 years34C – 36-F

How Do I Find The Right Bra Size?

How Do I Find The Right Bra Size

How To Measure Bra Size For A Teenager

The right bra must be of the correct band size and cup size.

To determine your overall breast size, you will need three different measurements, including:

  • length around your torso – under your breasts (band)
  • length across your breasts (bust)
  • overall breast volume (cup)

How To Measure Your Band Size

To get the band size, use a cloth measuring tape under your breasts, on the ribs, and wrap it all around. When you get the number, add 5 inches to it to determine your band size.

For example, if you get 27 inches, add 5 inches to get 32. This is the band size of the bra you should get. If your measurement ends up being an odd number, go up the next even number as bra sizes come in even-numbered bands.

How To Measure Your Bust Size

Next, you need to measure the fullest part of your breasts, wrapping the tape measure around you. While doing this, make sure your arms are pointing down in a relaxed position.

When measuring for band size, do not pull the measuring tape too firmly; the tape should be untwisted and should have contact with the teen’s body all the way around but should not be tight.

The number you will get will determine the correct cup size of your bra.

How To Calculate Your Cup Size

The bust line measurement will be higher than the band measurement. The cup size will be the difference between the two measurements. For example, if your bust line is 34 inches and your band measurement is 32, your cup size will be 2, which is a B cup.

Here is a guide for determining the cup size:

  • AA cup: ½ inch
  • A cup: 1 inch
  • B cup: 2 Inches
  • C cup: 3 Inches
  • D cup: 4 inches

It is also important to note that bra cups actually have more volume the higher the band size, which means that the cup of a 38D bra will appear a little larger and roomier than that of a 36D bra.

Please note that cup and band sizes vary around the world, as well as by brand. Measuring and trying on different bras is really the best way to determine your correct size.

You can use a bra size calculator for teens once you’ve measured your band and bust size.

This video shows you how to measure your bust and band size to calculate your bra size correctly:

❤️ Suggested reading: How To Teach Your Teen Daughter To Use A Tampon

What Determines Breast Size?

Breast size in teenagers is determined by a combination of factors, including genetics, hormones, and body weight.

  • Age determines breast size, as very young teens start to develop breasts. 
  • Genetics plays a major role, as breast size tends to run in families.
  • Hormones, specifically estrogen and progesterone, are also key determinants, as they stimulate breast growth during puberty.
  • Body weight can also affect breast size, as breasts are made up of fatty tissue.
  • Breast shape will also have an impact on the correct bra cup size.

However, it’s important to note that breast size can vary greatly among teenagers and is not necessarily an indication of overall health or development.

It’s also important for teenagers to wear properly fitting bras to ensure comfort and support during this period of breast growth.

What Is The Best Bra For Teenagers?

Finding the best bras for teenagers will most likely mean trying on many different types of bras to start. Taking some time to try on different bras is essential since different teenage bra brands and bra styles fit differently.

As your teenage daughter goes through puberty, she will most likely wear different types of teen bras, appropriate by age and breast size.

Training bras

Training bras don’t have cup sizes or under-wiring, so they’re much more comfortable and perfect as a starter bra. They don’t offer much support, but they help get your teen used to wearing a bra and can make her feel more confident as it covers up her chest area.

Training bras can be called crop top bras or slip-on bras.

Here are some examples:

Bleuet Training Bras
bleuet training bra
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  • Pull-On
  • 95% nylon 5% spandex
  • 12 pack
  • True to size fit

Fitted bras

Once your breasts start developing beyond ‘budding,’ you might want to start getting a fitted bra that will offer you more support.

There are many different options when it comes to fitted bras, from simple cotton bras to lace bralettes, balconette bras, plunge bras, padded bras, push-up bras, and underwire bras.

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  • Hook & Eye closure
  • 94% nylon 6% spandex
  • Sizing (S-3XL)
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  • Hook & Eye closure
  • 88% polyester 12% spandex
  • Ultra-light
  • Underwire bra
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  • Hook & Eye closure
  • 87.5% polyamide 12.5% spandex
  • Underwire bra
  • Demi bra
  • Straps convertible into cross back

Sports Bras

Many teens will probably need a sports bra as well. Sports bras are tighter and hold your boobs closer to your chest to minimize movement while playing sport.

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  • Pull-on closure
  • 100% Cotton
  • 3 pack
  • Spaghetti straps
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  • Pull-on closure
  • 60% nylon, 28% polyester, 12% spandex
  • Great support
  • Full coverage

Watch this useful video that demonstrates teenage bra fit issues when it comes to shopping for your first bra:

❤️ Suggested reading: Best Strapless Bra For Teens: Finding The Perfect Fit

The Average Bra Size for Teenagers in the US

Most teenagers in the US can fit into bras between 30A to 36B. Some may lean towards the smaller bras with A cups, while others may fit into as big as 36DD sizes.

The Average Bra Size for Teenagers in Canada

Most Canadian teenagers fit into the B and C cup bra sizes. The average band size can be as small as 28 and as big as 36 for teens in Canada.

The Average Bra Size for Teenagers in Australia

The average breast size for teens in Australia is between an A cup and a B cup for younger teens between 12 and 13 years old. Older teens beyond 15 years fit in the C cup, although some may fit better in D-cup bras.

The Average Bra Size for Teenagers in the UK

Teenagers in the UK wear bras between 30 A to 34 C. Those between 10 and 11 years old fit in the 30A size, while older ones above 13 fit in sizes between 34A to 36C. The average bra size UK for 16 year olds and older is 36D, which has increased significantly (from 34 B) in the last few years.

Research notes that this may be due to weight gain, increased Body Mass Index, as well as surveys including breast implants and breast augmentation surgeries.

The Average Bra Size for Teenagers In China

The most common size for teens in China is between 32A and 34C. Most Chinese teens are petite; therefore, the sizes can go as small as 30A. But many others fit into the bigger bra sizes between 34B and 36D.

Frequently Asked Questions About Bra Size

What is the Average Bra Size For A Teenager

What is the Smallest Bra Size?

The smallest bra size is cup AAA. This size is not common; therefore, most bra designing companies do not make them.

What is the Biggest Bra Size?

The biggest bra size is cup O, slightly bigger than N. The difference between the bust line and the chest measurement is between 14 to 15 inches.

Will My Breast Size Change?

Your breasts will go through changes as your body develops. Your breasts size may fluctuate throughout the month, depending on where you are in your menstrual cycle. Some people experience swelling of breasts closer to menstruation, which is normal.

As you grow older, your breasts will increase in size, but that is dependent on how quickly you develop and whether or not you add weight.

What Does the Letter in Bra Size Mean?

The letter in Bra size means the cup. The cup is the difference between the bustline and chest circumference measurement, usually in inch increments.

What Does the Number in Bra Size Mean?

The number in bra size means the band measurements, which is the chest measurements plus 5 inches. The number in bra size comes in even numbers; so, if the chest measurements plus 5 inches do not add up to an even number, you round off to the following even number.

Average Bra Size For Teens Conclusion

This guide can come in handy to find the average size bra for your teenage daughter. However, you may need to get your teen measured as various factors can play a role in the size of breasts besides age.

If you want to know what size your teen’s bra should be, measure her band and bust size. Having a bra that fits correctly can help prevent breast discomfort, back pain, and shoulder pain.