Is a 40M the same in every brand?

No — a 40M isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 40M translates in the brands we track: ThirdLove 40M, Wacoal 40M, Panache 40J, Freya 40J, Elomi 40J, Glamorise 40M, SHEFIT 40M, b.tempt'd 40M, Kindred Bravely 40M, ENELL 40M, Fantasie 40J.

What are the sister sizes for 40M?

40M's sister sizes — same cup volume, different band — are 38N and 42L. Try a sister size if the band feels too tight or loose but the cup still fits.

40M Bras

204 bras tracked in 40M · 2 brands · See all M cup

Brands: Elomi, Panache

Your 40M across brands

A 40M isn’t the same in every brand. Here’s how a standard US 40M translates across the brands we track — and how each one runs.

Brand	How it runs	Your 40M →
ThirdLove	cups run generous	40M
Wacoal	true to size	40M
Panache	true to size	40J
Freya	band runs small	40J
Elomi	cups run generous	40J
Glamorise	true to size	40M
SHEFIT	true to size	40M
b.tempt'd	true to size	40M
Kindred Bravely	true to size	40M
ENELL	true to size	40M
Fantasie	true to size	40J

Translate across all 30+ brands →

Editorial buying guide

Read the 40M buying guide

Top picks, sister sizes, and how to spot a good 40M fit.

Read →

Sister sizes

38N 42L What are sister sizes?

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Your 40M across brands

Anya Riva Print Balcony Tankini - Blue/Floral

Power Wired Sports Bra - Marble

Kira Active Balcony Swimsuit - Mulberry

Tango Balcony Bra - Nutmeg

Tango Balcony Bra - Navy

Sophie Nursing Bra - Linen

Envy Full Cup Bra - Indigo

Envy Full Cup Bra - Emerald Leopard

Envy Full Cup Bra - Terracotta

Harmony Plunge Bra - Hot Pink

Lauren Plunge Bikini Top - Verde

Tango Essence Balcony Bra - Cherry Red

Lauren Plunge Bikini Top - Magenta

Esme Balcony Bra - Ziggy

Esme Balcony Bra - Wildflower

Esme Balcony Bra - Wonderland

Endurance Wired Sports Bra - Blue

Endurance Wired Sports Bra - Chalk

Power Wired Sports Bra - Black/Chalk

Bliss Full Cup Bra - Lilac

Radiance Full Cup Moulded Bra - Ash Rose

Botanical Balcony Bikini Top - Botanical Floral

Radiance Full Cup Moulded Bra - Steel Blue

Estel Full Cup Bra - Royal Blue

Estel Plunge Bra - Royal Blue

Estel Plunge Bra - Blush Pink

Jaida Plunge Bra - Scarlet

Estel Full Cup Bra - Sage

Estel Plunge Bra - Rose Gold

Josephine Full Cup Bra - Magenta/Latte

Josephine Full Cup Bra - Cobalt/Latte

Natalia Full Cup Bra - Bordeaux Red

Illuminate Full Cup Bra - Dark Green

Upbeat Wired Sports Bra - Blue

Anya Spot Balcony Tankini Top - Black/White

Anya Spot Balcony Tankini Top - Navy/Ivory

Evie Balcony Strapless Bra - Black

Eden Balcony Bra - Black

Ashley Padded Balcony Bra - Black

Eden Balcony Bra - Pink

Non Wired Sports Bra - Black

Non Wired Sports Bra - Latte

Boundless Non Wired Sports Bra - Abstract Animal

Envy Full Cup Bra - Chai

Envy Full Cup Bra - Chestnut

Envy Full Cup Bra - Teal

Allure Full Cup Bra - Forest Green

Bliss Full Cup Bra - Rose Print

Power Wired Sports Bra - Digital Bloom

Sophia Plunge Bra - Red

Freedom Non Wired Sports Bra - Sienna Rose/Chalk

Naomi Nursing Bra - Noir

Ella Plunge Bra - Black Sequin

Josephine Full Cup Bra - Forest Green

Renee Balcony Tankini Top - Navy Gingham

Iris Balcony Tankini Top - Green Gingham

Estel Full Cup Bra - Cherry Red

Activate Wired Sports Bra - Black/Chalk

Paloma Balcony Swimsuit - Black Sand Print

Paloma Balcony Swimsuit - Navy Gingham

Paloma Balcony Swimsuit - Flutter Print

Paloma Balcony Swimsuit - Green Gingham

Tango Essence Balcony Bra - Honey

Tango Essence Balcony Bra - Black

Dream Full Cup Bra - Navy

Tango Edit Balcony Bra - White

Clara Full Cup Bra - Black/Pink

Anya Riva Spot Balcony Swimsuit - Navy/Vanilla

Cate Allure Full Cup Banded Bra: Deep Emerald

Anya Riva Balcony Swimsuit - Black

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