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, b.tempt'd 40M, Fantasie 40J. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

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

What is a 40M in other brands?

191 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

What is a 40M in other brands? See 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

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

Clara Full Cup Bra - Orchid/Red

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

Sachi Plunge Bra: Black

Morgan Stretch Banded Bra: Dark Romance

Reja Plunge Bra: Black

Nerina Stretch Plunge Bra: Rouge

Zarla Stretch Banded Bra: Sapphire

Namrah Bandless Plunge Bra: Pale Blush

Kintai Plunge Bra: Black

Lucie Stretch Plunge Bra: Wildcat

Lucie Stretch Plunge Bra: White

Lucie Stretch Plunge Bra: Pale Blush

Lucie Stretch Plunge Bra: Mocha

Lucie Stretch Plunge Bra: Mist

Lucie Stretch Plunge Bra: Black

Morgan Stretch Banded Bra: White

Morgan Stretch Banded Bra: Sahara

Morgan Stretch Banded Bra: Midnight

Morgan Stretch Banded Bra: Haute Red

Morgan Stretch Banded Bra: Black

Morgan Stretch Banded Bra: Toasted Almond

Morgan Stretch Banded Bra: Hot House

Morgan Stretch Banded Bra: Ebony

Morgan Stretch Banded Bra: Cameo Rose

Tiernie Stretch Plunge Bra: Sahara

Nerina Stretch Plunge Bra: Sahara

Nerina Stretch Plunge Bra: Black

Serene Full Cup Bra - Noir

Molly Nursing Bra: Cameo Rose

Matilda Plunge Bra: White

Matilda Plunge Bra: Sunset

Matilda Plunge Bra: Pearl Blush

Matilda Plunge Bra: Lunar Blue

Matilda Plunge Bra: Cafe Au Lait

Matilda Plunge Bra: Black

Brianna Plunge Bra: Heather

Brianna Plunge Bra: Black

Energise Sports Bra: Navy Geo

Energise Sports Bra: White

Energise Sports Bra: Nude

Energise Sports Bra: Navy

Energise Sports Bra: Black

Priya Plunge Bra: Vanilla

Priya Plunge Bra: Black

Molly Nursing Bra: Black

Aerith Plunge Bra: Rose

Darcie Padded Half Cup Bra: Azalea

Darcie Plunge Bra: Azalea