How Big is a 36DD Bra Cup Size?

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Large breasts come with a lot of challenges. They can lead to poor posture, chronic pain in the neck, shoulders, back, and underboob rashes. Moreover, the lack of awareness about the correct bra sizes can further elevate these issues.

This brings us to our topic, “how big is a 36DD bra cup size, and are you wearing the correct bra size?”

How Big Is 36DD?

The size 36DD refers to a band size of 32 to 34 inches and a bust size of 40 inches. The band size is measured just under your boobs, while the bust size is measured across the fullest part of your chest. You can only fit into the right-size bra if you measure your dimension correctly.

If your bra size is 36DD, your bust size measures around 40 inches with an underbust size ranging from 32-34 inches

It becomes even more imperative for you to invest in a good, well-fitting bra if you have a size 36DD. This is because bras for larger breast sizes are specially designed with additional features to provide better support. These include:

  • Wide straps to support the substantial bust size
  • Reinforced seams to maintain the cup shape
  • Taller cups to accommodate the side boobs
  • Firmer, sturdier band material to ensure the fabric does not strain and tear under the weight
  • Additional hooks to divide the load and keep the bra fastened
  • U-shaped backs or “ballet backs” where the straps curve into the band, distributing the weight over a larger area

For women with average sized frames with large breasts, like a 36DD, you need everyday support. Our favorite? The Elomi Banded Underwire Stretch Lace Bra. It has really supportive bands and a nice, three section cup.

Is 36DD Very Big?

DD boobs are larger than most, with only 1% of the population having breasts larger than a D cup size. However, they are still smaller than DDD breasts, which are one inch bigger.

While 36DD is towards the heavier side of the bra size spectrum, it is still a relatively common bust size. More and more lingerie and fashion brands are stocking bigger sizes, including E, F, G, H, and J.

Moreover, bras designed for bigger busts are no longer about providing only support. There is an increased demand for more stylish and sexy lingerie. Thus, these bras have the same aesthetical elements, such as lace design and sheer cup, as their smaller counterparts.

Woman with a tape measure draped in her body while wearing a white bra and blue jeans

However, there are some misgivings about the 36DD being amongst the most common bra sizes. These stem from the research that shows that about 80% of women wear the wrong size bra.

Some of them were too embarrassed to go for a proper fitting while others reached for the size that appeared most suitable. Thus, to save yourself from the discomfort of an ill-fitting bra, consult a fitting expert to get yourself measured correctly.

Can I Fit Into Other Bra Sizes?

Yes, you can go for alternate sizes, called the sister sizes, depending on how well you fit into your current bra. Sister sizes refer to sizes that surround your bra size and have approximately the same cup volume.

Graphic image that features an illustration of three white body mannequins representing 34DDD/F, 36DD and 38D as the sister sizes for a 36DD cup size

To determine your sister bra size, you can go up a band size and down a cup size, or vice versa.

Sister sizes for 36DD are 34E (sister size down) and 38B (sister size up). Since they have similar cup volumes, they should fit you comfortably around the boobs. However, the band can feel slightly tighter or looser.

Bra Size Measurement & Cup Size | A, B, C, D, DD Bra Sizes AND Extra Large Breasts


Found towards the bigger end of the spectrum, size 36DD fits women with 31-33.5 inches band size and a 40 inches bust size. Thus, women wearing 36DD are considered to have big breasts. Finally, if you are looking for sister sizes of 36DD, you can pick up a 34E or 38B.


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.