Bra Size Guides

G Cup Bras by Band Size (UK) – Find the Best Bras for Your Exact Band Size

This G cup bras by band size guide helps you find the best bras for your exact band size, with links to detailed pages covering fit, support and recommended styles for every G band size.

A G cup sits within the UK bra sizing system between FF and GG. However a 28G, 34G and 40G represent different cup volumes because cup size changes with band measurement.

If you want to understand the size itself before choosing a band, see our G Cup Bras Guide or explore real-world measurements in our How Big Are G Cups explanation.

If you are unsure of your starting size, begin with the Bra Size Calculator. You can then confirm your fit using our Bra Fitting Advice and compare sizing across brands using the Bra Size Converter.

What Is a G Bra Size?

A G bra size is part of the UK bra sizing system and appears between FF and GG in the cup progression. Each step typically represents about a 1 inch increase between the band size and the fullest bust measurement.

In most UK size charts a G cup corresponds to roughly a 9 inch difference between the band measurement and the fullest part of the bust. Because cup volume increases with band size, a 30G, 34G and 40G all represent different volumes.

Understanding G Cup Size

In the UK bra sizing system, each cup size step represents roughly a one-inch increase between the band size and the fullest bust measurement. A G cup sits between FF and GG in this progression.

If you want to compare neighbouring sizes, you can also explore our guides to FF cup bras by band size and GG cup bras by band size.

You may also find these related guides helpful:

Because cup size works together with band size, you can also use bra sister sizes to find equivalent sizes when adjusting the band while keeping a similar cup volume.

G cup sizes are available across many band sizes. For example, you can explore detailed guides for 34G bras, 36G bras and 32G bras.

Popular G Bra Sizes

Some G sizes appear more frequently in UK fuller-bust brands. These sizes sit near the centre of the band range and are widely produced by brands such as Panache, Freya and Fantasie.

G Cup Bras by Band Size

This G cup bras by band size guide allows you to quickly navigate to your exact size and explore bras designed for your specific band and cup combination.

Why Band-Specific G Guides Matter

Cup volume increases as band size increases. This means a 40G holds significantly more volume than a 30G, even though the cup letter is the same.

Because cup size always works together with band size, each G cup combination behaves differently in terms of structure, support and overall fit. Smaller band sizes typically require more precise tension and narrower wire shaping, while larger band sizes benefit from wider wings, reinforced frames and stronger fabric construction.

Reading guidance written specifically for your band size helps you understand how a G cup performs across different band measurements and can improve overall fit accuracy.

For example, a 32G bra combines a G cup with a smaller band measurement. A 34G bra sits near the centre of the G band range and is widely available across UK brands, while a 36G bra holds slightly more overall cup volume.

This G cup bras by band size guide brings together all available sizes from 28 to 50, helping you compare G cup bras by band size and choose styles suited to your measurements and support needs.

G Cup Bra Size FAQs

What is a G bra size?

A G cup sits between FF and GG in the UK sizing system and represents roughly a 9 inch difference between band and bust.

Is G bigger than FF?

Yes. G comes directly after FF in the UK cup sequence.

What cup size comes after G?

The cup size after G in the UK bra sizing system is GG.

Does the same G cup have the same volume on every band?

No. A 30G holds less volume than a 38G even though the cup letter is the same.

For a broader explanation of how bra sizing systems developed, you may also find this bra size overview helpful alongside the guides on this site.

Browse your specific band size above to find supportive GG cup bras suited to your measurements, or start with our Bra Size Calculator to confirm your size.