Bra cup sizes smallest to biggest – easy guide

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We get it – looking at bra cup sizes can be confusing and overwhelming, especially if you don’t understand how they work. However, finding a reliable bra cup sizes (smallest to biggest) chart is essential to get a proper fitting. 

Despite the critical engineering involved in bra cup sizes, how they are accurately measured remains a mystery. 

It is why there is no universal size standard for bra cups

Bra cup size charts differ depending on your bra brand and where you live. So we combed through the internet to get well-grounded information about them. 

When you’re out looking for bras that are best for you, don’t be shy, and feel free to ask questions. 

Everyone has a unique physique, and therefore no bra size will immediately fit you, even if you’re under a bra cup category. 

How to Properly Measure Your Bra Size

It’s easy to know your bra size measurements. All you need is a tape measure, a pen, and paper. 

Band Size

Opt to measure your breasts at their most natural state. So, remove your top, padding, binding, and other things that may enhance or restrict your breasts. 

Wrap the tape measure around your ribcage, just under your bust, and parallel to the ground.

Try to wriggle one finger under the tape. 

It’s important that it’s not wrapped tightly around you, or else you’ll end up picking a bra that’s constricted. 

Ending up with a tight bra band will make you uncomfortable since it’s directly resting against the bones of your ribcage. It will make breathing hard.

Then, round your measurement to the nearest whole number. 

Depending on the bra manufacturer, you’ll add specific numbers to your band size to make sure you have enough breathing room. 

Make it a habit to check any manufacturer’s note to identify these numbers.

The standard practice is to add four for even measurements and add five for odds. 

Some speculate that this practice was passed down from a time when bras were made from materials that couldn’t be stretched, like silk and satin.

Bust Size

Still parallel to the ground, wrap the tape measure around the most protruding part of your breast. 

Usually, this is at your nipple height. Then, round to the nearest whole number.

Cup Size

Subtract your bust size from your band size. 

If you getThen you’re an/a
0AA-cup
1A-cup
2B-cup
3C-cup
4D-cup, and so on

A more detailed bra size chart is as follows:

Band Size (Inches)Cup Sizes (Inches)
AAABC
2631.5-33.0
2832.7-34.333.5-35.0
3033.0-34.633.9-35.434.6-36.235.4-37.0
3235.0-36.635.8-37.436.6-38.237.4-39.0
3437.0-38.637.8-39.438.6-40.239.4-41.0
3639.0-40.539.8-41.340.5-42.141.3-42.9
3841.0-42.541.7-43.342.5-44.043.3-44.9
4043.0-44.543.7-45.344.5-46.045.3-46.8
4245.0-46.545.7-47.246.5-48.047.2-48.8
4446.8-48.547.6-49.248.4-50.049.2-50.8
DDDFG
2632.3-33.933.0-34.633.9-35.4
2834.3-35.835.0-36.635.8-37.436.6-38.2
3036.2-37.837.0-38.637.8-39.438.6-40.2
3238.2-39.839.0-40.539.8-41.340.5-42.1
3440.2-41.741.0-42.541.7-43.340.5-44.0
3642.1-43.742.9-44.543.7-45.344.5-46.0
3844.0-45.744.9-46.545.7-47.246.5-48.0
4046.0-47.646.8-48.447.6-49.2
4248.0-49.648.8-50.4
4450.0-51.6
HIJ
2635.4-37.036.2-37.8
2837.4-39.038.2-39.7
3039.4-40.940.1-41.740.9-42.5
3241.3-42.942.1-43.742.9-44.5
3443.3-44.944.0-45.7
3645.3-46.8

Bra Cup Sizes Smallest To Biggest

Common bra cup sizes are labeled A to DD, but there might be instances when you won’t be able to find your correct size. 

To ensure that you have the proper measurements, you can get professionally measured at lingerie shops.

A, AA, AAA

What is the smallest cup size? No, it’s not AA. The smallest bra size is actually AAA, with less than a 0.5” difference between the band and bust size. 

It’s an uncommon size, so you don’t see it in mainstreams stores often. 

Although not all bra size charts have AAA and AA, professional bra makers offer to create them to accommodate the one-inch difference between the band and bust size.

B

There are no BB or BBB cup sizes, unlike the previous cup size. 

If a B cup doesn’t quite fit you, you can try between A or C to find your size. 

C

Similarly, C cups are stand-alone and don’t have any additional letters to accompany them. C is also the most popular ideal cup size for women.

D, DD, DDD

People with D-cup breasts carry around bigger breasts daily, making it a burden for most women since they can’t jog or do strenuous exercise or activities. Because of this predicament, women who have D-cups usually wear full-coverage bras that can support their chest.

E

Bra size charts become more confusing when you’re larger than a D-cup. 

General retailers don’t have the supplies to cater to women with bra cups larger than DD. However, due to the recent rise in plus-size bras online, more and more E-cup bras are being produced.

F, FF

You can find these bra cup sizes in specialized bra stores. However, keep in mind that the bras may have varying measurements depending on the manufacturer and the designer. 

If you can, it’s best if you have your bra made by experts.

G

Women with G-cups can either order online or visit specialized bra boutiques to get the support they need. 

People with G-cups are prone to chronic back pain, so bear in mind to search for bras that fit you the best. 

However, having a G-cup doesn’t mean you should only strive for maximum support. 

You can also pick bras that will help you improve your shape and increase your confidence. 

Many online lingerie stores are available, offering many designs and styles to compliment your full figure.

H and Over

What is the biggest cup bra size in standard retailer stores? Mainstream stores often carry bra cup sizes up to the letter O in the US.

A fun fact: The biggest bra size in the world is 102 ZZZ by Annie Hawkins, who has the largest pair of natural breasts in the world.

Much like the previous bra size, women who need H-cups and over can only get their bras at online stores that produce specialized bras for their size. 

How to Convert Cup Sizes

Here is a chart to help you convert your cup sizes among varying regions:

DifferenceUS(United States)UK(United Kingdom)EU(European)
½”AAAA
1”AAA
2”BBB
3”CCC
4”DDD
5”DDDDE
6”DDD/FEF/DDD
7”GFG
8”HFFH
9”IGI
10”JGGJ
11”KH
12”LHH
13”MJ
14”NJJ
15”OK

Do You Have To Wear A Bra?

At the end of the day, you don’t have to wear anything you’re not comfortable in. So it’s important to consider the many factors in play when you’re picking the bra that’ll fit you. 

Bras are there to support and give you coverage. If you find shopping for bras taxing, you can make your current ones last by properly taking care of them. 

You can make your bras last for as long as one year if you rotate between 5 to 9 items and hand-wash them on a regular schedule.

Do You Have To Wear A Bra To Sleep?

You can, but you should ensure that the bra you’re wearing is breathable and stretchy. 

It should also be void of any underwire that can irritate your skin and pressure the muscles underneath. 

It’s also best to assign bras for when you have your menstrual cycle to ensure utmost comfort when your breasts are most sensitive.