How Big Do Bra Cup Sizes Go?

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Do you find yourself wondering how big do bra sizes go? Many women are curious about this because it is not always easy to find larger sizes in stores. Here’s some information to help you answer your question.

How Big Do Bra Sizes Go?

Bra sizes start from a 32 bra size to a 44 bra size. According to most U.S. brands, bra sizes start from A being the smallest size to H being the largest. Currently, the biggest bra size is a 102 ZZZ customized for Annie Hawkins-Turner.

Brand new bras

If your bra size is bigger, you will have to request a custom-made one, although it might be a little expensive. Nevertheless, what is essential is to ensure that you have a bra that fits you well and is comfortable wearing.

What Determines Bra Size?

A woman’s bra size is determined by her band size and cup size, expressed as numbers and letters. The difference between these two measurements determines the cup size. That is why it’s better if you know how to measure your bra size.

Bigger Breast Cup Sizes

Most women classify their cup size as either A, B, or C. D cups are getting larger, and are considered above average in size.

Only 1% of women have boobs larger than a D, and DD and DDD are even larger cup sizes.

There are several big breast cups like the E, F, G, and H. All these sizes are found online or in local stores but let’s look at the I, J, and K cup sizes in depth.

  • I cup size: the overbust size is 9 inches bigger than the underbust size.
  • J cup size: the overbust is 10 inches bigger than the underbust measurements.
  • K cup size: Its overbust is 11 inches larger than underbust size. With K cups, always look for bras with wide straps, side support, wide bands, and seamed cups.

What Is a Big Bra Size?

A big bra size has a five to nine-inch difference between the band and bust measurements. Cups E, F, G, and H fall in a big bra size category and outside the standard A to D.

What Is a Large Bra Size?

A large bra size has an underbust size ranging from 42 to 44 inches. A large bra may have a size transition between 10 to 12 inches.

Different colors and style of laced bras

What Is a Large in Bra Sizes?

Ladies who have large breasts or have undergone breast augmentation can use I, J, K, and L, which are considered large cups in bra sizes.

What Is an XL in Bra Size?

An XL in bra size may have a bust and band size difference beyond 12 inches. For instance, your underbust size may range from 50 to 52, with the cups ranging from M to Z.

What Makes Breasts Bigger?

In most cases, bigger busts are brought up by genetics. If a lady has bigger breasts in your family and you are related to them by blood, there is a higher chance that you will also have bigger breasts.

Your bust can also become bigger because of medication, weight gain owing to menopause, general weight gain, and thyroid conditions. Additionally, pregnancy can cause your breasts to increase in size.

However, most women will experience having big breasts while breastfeeding. It is because your breasts tend to be pumped with milk, and this makes them extra heavy.

Pros and Cons of Larger Breast Sizes

Some women with full busts end up viewing their big breasts as a blessing or as a curse. When it comes to big breast sizes, it all depends on your viewpoint. Our society prices big breasts as attractive, and many women flaunt their big breasts since they make them feel sexy.

One disadvantage of big breasts is that you get unwanted attention. Large breasts can also cause back pains since the back gets strained from supporting all the weight from your breasts.


Whether you are blessed with big or small cup sizes, you should embrace your natural breast size. If you have large breasts, ensure you have a pretty, stylish, and fitting bra that gives you the comfort and confidence that you need. Don’t be worried when people stare; remember, big breasts make you look sexy.


Hi there, I’m Allena, Founder and Editor of The Better Fit. I’ve always had a passion for finding ways to help women improve various areas of their lives. I have researched and worked to create this website so women would have a place to come and be informed about an article of clothing they literally wear every day.