A Knixpert's Guide to Breast Mass: How Much Do Boobs Weigh?

July 31, 2024
Isabella Torchia

I pray that a day never comes where someone leaks my Google Search history.

“Is Ernie a Muppet,” “Can you have a raccoon as a pet,” “What's pickleball,” “How much do breasts weigh.”

And like, that's the normal stuff. But what can I say? I love to ask questions and I love to get answers. Shrugs! Like yes, Ernie is in fact a Muppet. No, you actually can't domesticate a raccoon (illegal). I love learning!

As for how much breasts weigh? Well, that answer is a bit more complicated than the above. But not to worry. I went down the rabbit hole so you don't have to. 

If you've ever wondered how heavy your Thelma and Louise's are, let's embark on a journey together to uncover the mysteries of all things breast weight (and the magic of a good ol' supportive bra).

So… How Much Do They Weigh? 

The One&Only Scoop Bra in Pink Lemonade display: full

Just like kiwis and watermelons weigh differently, so do boobs. The short answer is that it varies. Naturally, if you have FF cup boobs, they're going to be different from what AA cup breasts weigh.

The long answer: Breast weight depends on a ton of factors—including cup size, shape, body weight, age, hormone levels, life stages, as well as breast composition and density.

Breast density (as you can imagine), plays a pretty big role when it comes to breast weight. Boobs composed of dense glandular and fibrous tissues are heavier than those with more fatty tissue, even if they're the same size. On top of that, most people lose breast density as they get older too.

All this is to say, two people who wear the exact same cup size can have completely different breast weight.

Because of factors like breast density, there's no straight answer across the board when it comes to weight (not to mention more than half of people have one boob that's bigger than the other). But an average breast weight looks a little something like this:

  • A cup boobs weigh around 0.5 pounds each

  • B cup boobs weigh around 0.6 pounds each

  • C cup boobs weigh around 1 pound each

  • D cup boobs weigh around 1.5 pounds each

  • DD/E cup boobs weigh anywhere between 1.5 pounds to 3 pounds each​ 

  • F/FF cup boobs weigh anywhere between 3 to 4 pounds each

Sources: (Genie), (Breast and Body UK), (Statcare)​

How to Measure Your Unique Breast Weight

The One&Only Scoop Bra in Glacier display: full

Now, if that answer isn't satisfying enough and your curiosity is getting the better of you—you can in fact measure the weight of your own breasts. It's a little involved, but like, what a fun fact to know about yourself.

With that, here's how to measure your breast's actual weight:

You'll need: 

  • A kitchen scale 

  • A tray that has a lip 

  • A large bowl (big enough to fit one of your boobs in there)

  • A calculator 

Then all you need to do is: 

Step 1: Measure the weight of the tray.

Step 2: Fill your bowl with water completely to the rim, and place onto the tray. 

Step 3: Now plonk one breast into the bowl of water, and make sure it's fully submerged. Water displaced by your breasts will push water out into the tray underneath.

Step 4: Weigh just the tray of water.

Step 5: Subtract the weight of the tray with the water > with the weight of JUST the tray. 

Step 6: Take the difference, and multiple it by 0.9. Why? Breast tissue breast tissue has a different weight by volume then water.

Step 7: Repeat for your other breast! And voila!

#HeavyBreastProblems

Revolution V-Neck Bra in Glacier display: full

You most likely don't need to be doing all that math to confirm whether or not your boobs are heavy. You can probably just tell.

It can be a lot to carry, so it's not surprising a study of 300 women in The Open Orthopaedics Journal concluded that when it comes to large breasts, breast size can lead to continuous tension on muscle groups that cause shoulder, neck, and back pain.

For some, chronic pain and discomfort can lead to solutions like breast reduction surgery. For others, it may just come down to finding the right bra.

And while there are also things like rashes, shortness of breath, headaches, and numbness to contend with, there's also a 🚨BRA ISSUE🚨 affecting things too. Way to many folks are walking around wearing the wrong bra sizes.

A 2013 study of postmenopausal women found that those with heavy or larger breasts often wear the wrong bra size, which can actually cause implications for “thoracic” (upper and middle back) pain.

What's Next For You and Your Heavy Boobs

The WingWoman Contour Bra in Pink Lemonade display: full

Trust the science—simply knowing what bra size you are can help alleviate some of those #HeavyBreastProblems. Getting fit by experts in-store, or even taking an online quiz can set you on the right track.

If you have larger breasts, be sure to shop brands with inclusive bra sizes. You can also switch up the kind of bra you wear.

Here's an easy checklist to refer to when bra shopping: 

  • Bras with wider bands and adjustable hooks will provide more support and stability and help take some of that weight off your back. Our recommendation? The Revolution V-Neck Bra.

  • Wider straps that are also adjustable, to help distribute weight off of your shoulders. Our recommendation? The Revolution Adjustable Pullover Bra

  • Full coverage cups and side support panels that provide support and prevent your boobs from spilling out. Our recommendation? The WingWoman Contour Bra

  • Breathable and extra comfy fabric. Our recommendation? The One&Only Scoop Bra

So there you have it. Off to dunk my boobs in a bowl of water (and maybe buy a new bra…). I'll let you know how it goes! 

We hope you found this post informative—but remember: we're not doctors and this post is not medical advice! While all posts are fact-checked and well researched, we always recommend you chat with your doctor about any questions or concerns you might have regarding a medical condition.

We're here to support and educate, but never with the aim of disregarding professional medical advice you've been given. Phew, now that that's out of the way, you can go on living unapologetically free.