A 30G bra fits a 30 inch underband with a nine inch difference between your underbust and the fullest part of your bust. It is a small back with a full bust, so the band has to stay firm while the cups hold a lot of volume without gaping at the top.
Our 30G bras come mainly from Freya and Fantasie, with Panache adding sports and balcony styles. If the band feels loose, your sister size is 28GG. If it feels tight, try 32FF.
Side Support From Fantasie
Fantasie makes most of the 30G side support bras here. A side panel in the cup moves breast tissue forward, which gives a narrower silhouette and keeps the wire from pressing under the arm. Shop all side support bras or the full Fantasie range.
Plunge and T-Shirt Bras From Freya
Freya leads on plunge and moulded styles in 30G. A plunge bra suits lower necklines, and a T-shirt bra gives a smooth line under fitted tops. Curvy Kate and Fantasie add strapless options.
30G Sports Bras
For running and gym work, there are 30G sports bras from Panache, Shock Absorber and Freya, each cut to hold a full bust on a small band. Browse all sports bras.
Checking Your 30G Fit
Fasten a new bra on the loosest hook so you can tighten it as the band relaxes. The wire should sit behind breast tissue at the side, not on it. If you are unsure of your size, start with our bra size calculator, then read the fitting guide.
Related Sizes
All G Cup Bras | 28G Bras | 32G Bras | 34G Bras | 36G Bras | 38G Bras | 40G Bras | 42G Bras | 44G Bras | 46G Bras | 48G Bras