Question 1

Is a 30F the same in every brand?

Accepted Answer

No — a 30F isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 30F translates in the brands we track: ThirdLove 30DDD, Wacoal 30DDD, Panache 30E, Freya 30E, Elomi 30E, Glamorise 30DDD, SHEFIT 30DDD, b.tempt'd 30DDD, Kindred Bravely 30DDD, ENELL 30DDD, Fantasie 30E.

Question 2

What are the sister sizes for 30F?

Accepted Answer

30F's sister sizes — same cup volume, different band — are 28G and 32DDD. Try a sister size if the band feels too tight or loose but the cup still fits.

30F Bras

Your 30F across brands

Bare Mesh Plunge Bra: Indigo

Bare Mesh Plunge Bra: Atmosphere

Lace Contour Plunge Bra: Soft-Pink

Lace Contour Plunge Bra: Black

Bare Mesh Unlined Bra: Zest

Bare Mesh Unlined Bra: Rose-Dust

Front-Closure Stretch Lace WonderWire Bra White

Front-Closure Stretch Lace WonderWire Bra Cafe

Front-Closure Stretch Lace WonderWire Bra Black

Zero Edge™ Wireless Push-Up Bra: Violet-Ice

Zero Edge™ Wireless Push-Up Bra: Black-Leopard

Zero Edge™ Push-Up Bra: Taupe

Zero Edge™ Push-Up Bra: Black

Zero Edge™ Push-Up Bra: Leopard

Zero Edge™ Wireless Push-Up Bra: Taupe

Zero Edge™ Wireless Push-Up Bra: Black

24/7® Classic Strapless Push-Up Bra: Taupe

Zero Edge™ Wireless Push-Up Bra: Leopard

Zero Edge™ Contour Bra: Taupe

Brand	How it runs	Your 30F →
ThirdLove	cups run generous	30DDD
Wacoal	true to size	30DDD
Panache	true to size	30E
Freya	band runs small	30E
Elomi	cups run generous	30E
Glamorise	true to size	30DDD
SHEFIT	true to size	30DDD
b.tempt'd	true to size	30DDD
Kindred Bravely	true to size	30DDD
ENELL	true to size	30DDD
Fantasie	true to size	30E