Is a 28K the same in every brand?

No - a 28K isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 28K translates in the brands we track: ThirdLove 28K, Wacoal 28K, Panache 28H, Bravissimo 28H, Freya 28H, Elomi 28H, Glamorise 28K, b.tempt'd 28K, Fantasie 28H. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

What are the sister sizes for 28K?

28K's sister sizes — same cup volume, different band — are 30J. Try a sister size if the band feels too tight or loose but the cup still fits.

28K Bras

What is a 28K in other brands?

158 bras tracked in 28K · 3 brands · See all K cup

Brands: Bravissimo, Freya, Panache

Your 28K across brands

A 28K isn’t the same in every brand. Here’s how a standard US 28K translates across the brands we track — and how each one runs.

Brand	How it runs	Your 28K →
ThirdLove	cups run generous	28K
Wacoal	true to size	28K
Panache	true to size	28H
Bravissimo	true to size	28H

What is a 28K in other brands? See all 30+ brands →

Editorial buying guide

Read the 28K buying guide

Top picks, sister sizes, and how to spot a good 28K fit.

Read →

Sister sizes

30J What are sister sizes?

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Your 28K across brands

365 Moulded T Shirt Bra - Black

365 Moulded T Shirt Bra - Honey

365 Moulded T Shirt Bra - Lipstick

365 Moulded Plunge Bra - Honey

Katherine Nursing Bra - Black

Boundless Non Wired Sports Bra - Black

Boundless Non Wired Sports Bra - Berry/Chalk

Allure Spacer T Shirt Bra - Black

Lacey Bra - Black

Allure Full Cup Bra - Ivory

Allure Full Cup Bra - Black/Latte

Allure Full Cup Bra - Azure Blue

Allure Full Cup Bra - True Red

Allure Full Cup Bra - Honey

Ultimate Comfort Bra - Burgundy

Ultimate Comfort Bra - Dusky Blue

Ultimate Comfort Bra - Black

Ultimate Comfort Bra - Blush

Lauren Plunge Bikini Top - Cobalt

Lauren Plunge Bikini Top - Red

Freedom Non Wired Sports Bra - Black/Chalk

Una Bra - Blush Pink

Lacey Flourish Bra - Navy

Power Wired Sports Bra - White

Endurance Wired Sports Bra - Black

Power Wired Sports Bra - Latte

Endurance Wired Sports Bra - Dusty Rose

Endurance Wired Sports Bra - Berry/Chalk

Endurance Wired Sports Bra - Sienna Rose

The Shoulder Ease Bra - Steel Blue

Niya Smoothing Bra - Smokey Green

Millie Luxe Bra - Black

Millie Luxe Bra - White

Una Bra - Forest Green

Millie Luxe Bra - Burgundy

Endurance Wired Sports Bra - Black/Latte

Millie Nursing Bra - Black

Isabella Balcony Swimsuit - Polka Dot Print