What Bra Size Is Saoirse Ronan?

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Saoirse Ronan, an American-Irish actress, began her acting career as a child actor and has since achieved international success. Her roles in The Grand Budapest Hotel, The Lovely Bones, Little Women, and Lady Bird are among her most recognizable works.

Since becoming one of the most in-demand actresses of her generation, her fanbase continues to grow with curiosity about her appearance. I’m going to talk about Saoirse Ronan’s bra size and how it affects her body.

What Bra Size Is Saoirse Ronan?

Saoirse Ronan’s bra size is 30B. She is a B cup since her bust measures around 31 and 32 inches, while her band is between 26 and 28 inches.

Graphic image of Saoirse Ronan with 30B bra size wearing a green spaghetti strap v-neck sequin dress

She has a slim, banana-figure body with full hips, firm busts, and a flat stomach. Her 30B breasts make enough projection without feeling heavy, unlike fellow actress Lindsey Pelas, who has a 30H bra size.

Saoirse Ronan can size down to 28C if the band rides up the back or go up to 32A if the band feels too tight. This means she shares nearly similar bust proportions to dancer and TikTok star Charli D’Amelio, who wears a 32A bra size.

Saoirse Ronan Measurements

Saoirse Ronan is average in height, measuring in at 5 feet 6 inches (5′ 6”). It’s estimated that her body measurements are 32-23-34 inches, which translates to a bust size of 32″, a waist size of 23″, and a hip size of 34”. She weighs roughly 121 pounds.

Benefits of a Small Bust

Don’t Have Back Pain

Ladies blessed with small breasts can avoid the dreaded back pain. Breast weight can cause your shoulders to move forward, which forces the muscles in your back and shoulder blades to adjust. Having less weight in front means your torso can easily carry your breasts, and the weight doesn’t need to be redistributed.

Can Easily Sleep On Your Stomach

Another advantage of having small breasts is that you can comfortably sleep on your stomach without it being painful on your chest. There’s no need to toss and turn at night to prevent squashing your breasts. It’s also fairly easy to choose sleep clothes.

Can Go Braless

One of the best things about being small-chested is that if you don’t want to wear a bra, you don’t have to! At their core, bras are meant to support your boobs, and when you are an A or B cup, you don’t need a bra for this purpose.

Drawbacks of a Small Bust

Sports Bras Can Flatten Breasts Too Much

The right sports bras with hooks are a must-have in every woman’s wardrobe, even if you have small breasts. However, some sports bras, like minimizer sports bras have the potential to flatten your chest by compressing more breast tissue. It’s like watching your small breasts disappear once you wear a sports bra as a top.

Might Feel Self Conscious

It’s normal to feel self-conscious about having small breasts, particularly if you truly want to have large boobs. This can sometimes make you focus on looking for bras that can volumize your small breasts regardless of the fit. However, small breasts can be as sexy as other breast sizes.

Breasts Stay Small as You Gain Weight

If your breasts are dense with tissue, they won’t grow in size even as you gain weight. In turn, they may look significantly smaller as you gain more fat in other parts of your body. However, if you lose weight, the fat in your breasts may also reduce, causing your boobs to become even smaller.

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


Saoirse Ronan has a 30B bra size. She has shallow breasts, so they may look somehow flat, depending on the outfit. Triangle, strapless, and padded bras meant to fill flat chests, work best for this size.


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.