How Big Is a 40DD Bra Cup Size?

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Huge boobs have several difficulties. Moreover, a lack of knowledge about proper bra sizes might increase these difficulties. Choosing the correct bra is one of the secrets to looking and feeling fabulous. This post will address how to determine whether you have a 40DD cup size and how big is a 40DD bra size.

How Big Is a 40DD Bra?

The size 40DD corresponds to a band size of 35 to 39 inches and a bust size of 43 to 45 inches. The band size is taken just beneath your boobs, while the bust size is taken over the most expansive area of your chest. You can only fit into the correct-size bra if your measurements are accurate.

Graphic image of a woman wearing an olive green top and black shorts explaining that a 40DD bra size has a bust size of 44-45 inches and a band size of 39-40 inches

Your sister sizes are 38E, 36F, 34FF, 32G, 30GG, and 28H if you wear a 40DD. A DD cup has a 5-inch difference in breast and band measures, making it an inch larger than a D cup. Your breasts might weigh up to 2.15 pounds if you are a 40DD cup size.

How Do You Measure Your Cup Size?

One of the most challenging issues that women have is finding a well-fitting bra that is both cozy and supportive. Finding the perfect fit is particularly difficult for large-breasted ladies. There are several methods for determining your bra cup size. Today I shall discuss the simplest one. You need a measuring tape.

Step 1: Take a Chest Measurement

First, ensure you’re not wearing a push-up bra before collecting your measurements. Wrap the measuring tape across your back; it should be level with your bra band. You don’t want the tape digging into your back or overly loose. It is advised that you increase your bra band size by 2 to 4 inches.

A cream full-coverage underwire bra with a floral lace design and black adjustable straps placed on a white mannequin

Step 2: Determine Your Cup Size

Wrap the measuring tape around your body again, this time over your breasts, and take another chest measurement. Subtract your band size from the figure you just obtained to get your cup size.

Step 3: Ensure That It Is a Perfect Fit

You may always go to a lingerie store if you’re still unsure whether your bra cup is right. Request assistance from pros and try on several styles of bras.

The hooks should be on the loosest setting, and your breasts should fill up the cups. Adjust the straps so they don’t dig into your skin. If you feel at ease and your bra fits well, this is the bra for you.

What Are the Best 40DD Cup Bras Available?

There are various styles of bras for different breast shapes. I’ve compiled a list of the top bras for your 40DD cup size. Remember to select the right bra.

A blue full-coverage underwire bra with an adjustable strap placed on a white mannequin
  • Bralette bralette bras are often non-padded, non-wired, and slip-on types. With less support and structure, this form emphasizes elegance and comfort. They can also be worn as trendy outerwear.
  • Strapless bra strapless bras are most likely the most popular alternative for attire that exposes your shoulders. They usually work the same way as a traditional bra, wrapping around your chest, although without the added support of shoulder straps.
  • Sports brathis bra is ideal for sports or everyday use. It provides full coverage for 40DD cup-size women who desire support all day. It’s intended to protect your boobs from jumping about during physical activities such as jogging, hiking, and yoga.
  • Minimizer – a minimizer can let you wear a form-fitting dress without revealing the size of your breasts. It might make your bust look smaller by dispersing the mass of your breasts. This bra typically provides much coverage to keep things from spilling over.
  • A t-shirt bra – this bra should be in every woman’s lingerie closet. T-shirt bras are intended to be seamless and unnoticeable. Some have padding or push-up technology incorporated. T-shirt bras are your go-to for everyday use. Wear these beneath almost anything for total body confidence.
  • Front closure braa front-open bra features a fastening between the cups in the front. This bra is easier to remove and put on than a bra with a back hook. Because the hook is at the front of the bra, it provides a seamless finish at the back. This bra type is ideal for those who find it difficult or inconvenient to hook the bra in the back.

Related Questions

How Does a 40DD Cup Look?

If the top and bottom of the boobs have enough fatty tissue, a DD cup may seem more projecting. If your hips or waist are slimmer, your DD cup may appear larger.

Is a 40DD Cup Large or Small?

A 40DD cup is huge in comparison to other standard bra sizes. It’s rated large since the band and bust dimensions differ by five inches.

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


Fitting within the average breast size range isn’t as crucial as fitting into your comfort level regarding your health and well-being. Measure yourself and determine your bra size to feel comfortable wearing a bra. Confirm that you are a 40DD before looking for the appropriate bra type for your breasts.


Allena is the Founder and Editor of The Better Fit, a platform dedicated to empowering women with practical advice on bras and fitness, inspired by her own revelation of the widespread issue of incorrect bra sizing. Her expertise and tips have been recognized by major publications such as Cosmopolitan, Better Homes & Gardens, Insider, and NBC, making her a trusted voice in women's wellness and lifestyle.