Is a 42K the same in every brand?

No - a 42K isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 42K translates in the brands we track: ThirdLove 42K, Wacoal 42K, Panache 42H, Freya 42H, Elomi 42H, Glamorise 42K, b.tempt'd 42K, Fantasie 42H. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

What are the sister sizes for 42K?

42K's sister sizes — same cup volume, different band — are 40L and 44J. Try a sister size if the band feels too tight or loose but the cup still fits.

42K Bras

What is a 42K in other brands?

146 bras tracked in 42K · 4 brands · See all K cup

Brands: Elomi, Glamorise, Panache, Wacoal

Your 42K across brands

A 42K isn’t the same in every brand. Here’s how a standard US 42K translates across the brands we track — and how each one runs.

Brand	How it runs	Your 42K →
ThirdLove	cups run generous	42K
Wacoal	true to size	42K
Panache	true to size	42H
Freya	band runs small	42H

What is a 42K in other brands? See all 30+ brands →

Editorial buying guide

Read the 42K buying guide

Top picks, sister sizes, and how to spot a good 42K fit.

Read →

Sister sizes

40L 44J What are sister sizes?

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Your 42K across brands

Tango Balcony Bra - Nutmeg

Tango Balcony Bra - Navy

Chi Chi Balcony Bra - Cappuccino

Harmony Plunge Bra - Hot Pink

Tango Essence Balcony Bra - Cherry Red

Esme Balcony Bra - Ziggy

Esme Balcony Bra - Wildflower

Esme Balcony Bra - Wonderland

Bliss Full Cup Bra - Lilac

Estel Full Cup Bra - Royal Blue

Estel Plunge Bra - Royal Blue

Estel Plunge Bra - Blush Pink

Estel Plunge Bra - Berry

Jaida Plunge Bra - Scarlet

Estel Full Cup Bra - Sage

Estel Plunge Bra - Rose Gold

Josephine Full Cup Bra - Cobalt/Latte

Natalia Full Cup Bra - Bordeaux Red

Andorra Full Cup Bra - Black

Illuminate Full Cup Bra - Dark Green

Anya Spot Balcony Tankini Top - Black/White

Anya Spot Balcony Tankini Top - Navy/Ivory

MagicLift Front-Closure Posture Back Bra Blue

MagicLift Front-Closure Posture Back Bra White

MagicLift Front-Closure Posture Back Bra Cafe

Eden Balcony Bra - Black

Ashley Padded Balcony Bra - Black

Eden Balcony Bra - Pink

Bliss Full Cup Bra - Rose Print

Sophia Plunge Bra - Red

Back Appeal® H-K Cup Underwire Bra: Regina Red

Ella Plunge Bra - Black Sequin

Josephine Full Cup Bra - Forest Green

Estel Full Cup Bra - Cherry Red

MagicLift Active Support Bra Gray Heather

MagicLift Active Support Bra Cafe

MagicLift Active Support Bra White

MagicLift Active Support Bra Black

Tango Essence Balcony Bra - Honey

Tango Essence Balcony Bra - Black

Dream Full Cup Bra - Navy

Tango Edit Balcony Bra - White

Cate Allure Full Cup Banded Bra: Deep Emerald

Kintai Plunge Bra: Blackberry

Cate Full Cup Banded Bra: White

Cate Full Cup Banded Bra: Latte

Cate Full Cup Banded Bra: Hazel

Cate Full Cup Banded Bra: Black

Cate Allure Full Cup Banded Bra: Sahara

Cate Allure Full Cup Banded Bra: Black

Tango Balcony Bra - Honey

Tango Balcony Bra - Blush

Tango Balcony Bra - Black

Dream Full Cup Bra - Pistachio

Lucie Stretch Plunge Bra: Midnight

Charley Stretch Plunge Bra: Fawn

Charley Stretch Plunge Bra: Black

Charley Stretch Plunge Bra: Ballet Pink

Charley Plunge Bra: Jet

Sachi Plunge Bra: Cafe Au Lait