G Cup Bras – Brands That Make G Cups & How to Find Your Size
A UK G cup is one of the most common fuller-bust sizes, yet many women still struggle to find bras that fit and support properly. This guide focuses specifically on G cup bras, explaining which brands make them, how sizing differs between brands, and how to confirm your correct size before buying.
To find your starting size, begin with our Bra Size Calculator, then explore the brands listed below.
Want to browse G cup bras by band size? Visit our G Cup Bras by Band Size page to jump straight to sizes like 32G, 34G, 36G and more.
Who This Guide Is For
- Women who wear a UK G cup
- Those experiencing spillage or lack of support
- Customers moving beyond high-street sizing limits
- Shoppers comparing fuller-bust specialist brands
- Anyone repeatedly sister-sized due to limited availability
Why Not All G Cup Bras Are the Same
The G cup is part of the UK bra sizing system used by many lingerie brands. While G is a recognised bra size, some brands use different cup lettering sequences, which can make size comparisons confusing.
In extended UK sizing, G sits between FF and GG. Some traditional cup sequences move directly from G to H instead, which is why checking the brand's sizing system is important when comparing bra sizes.
If you are unsure how this size compares to neighbouring cups, see our guides explaining F vs FF vs G cup size differences and G vs GG vs H cup size differences .
How Big Is a G Cup?
A UK G cup bra sits within the fuller-bust range of the UK cup size sequence. However, how large a G cup appears depends on factors such as band size, body proportions and bra design.
For example, a 30G and a 40G do not have the same cup volume. Cup volume increases as band size increases, which is why the cup letter alone does not tell the full story.
If you would like to see visual examples across different band sizes, visit our How Big Are G Cups? guide.
G Cup Size Progression
A G cup sits between FF and GG in the extended UK cup size sequence used by many fuller-bust brands. The diagrams below show how cup volume increases gradually while the band size remains the same.
G sits between FF and GG in the UK bra size sequence.
These simplified educational diagrams show how cup volume increases across nearby UK cup sizes when the band size stays the same.
Cup volume increases gradually across the UK sizing system. A 34GG has more cup volume than a 34G, while a 34FF has slightly less.
How cup sizes actually work: Bra cup sizes are based on a simple fitting rule — each step in the cup sequence represents a 1 inch difference between the bust and underbust measurement. This rule applies across all UK brands, regardless of whether they use a traditional or extended cup letter sequence.
In brands that use an extended UK cup sequence, G is a separate cup size positioned between FF and GG. Each step represents the same one-inch increase in measurement difference, making G one cup size larger than FF and one cup size smaller than GG.
The difference between brands is the lettering used, not the size step itself. For example, some traditional UK cup sequences move directly from G to H, while extended UK sizing includes GG as an additional cup size between them.
UK vs US Bra Sizes
Bra sizing systems vary slightly between regions. Most specialist fuller-bust brands such as Panache, Freya, Fantasie and Elomi follow the UK cup size sequence, which includes double letters such as FF, GG and HH.
Some US brands use a slightly different lettering system, which can create confusion when comparing sizes internationally. To understand how the sizing systems relate, see our UK vs US bra size comparison guide .
Is a UK G Cup the Same as a US G Bra Size?
It depends on the brand. Many UK and US lingerie brands use the same cup lettering for G cups, meaning an G cup is often labelled the same in both sizing systems.
However, some brands use different cup progressions or regional sizing conventions. For this reason, always check the brand’s stated sizing system rather than relying on the cup letter alone.
A cup size is not one fixed volume. Cup volume increases as the band size increases, so a 30G, 36G and 44G are all very different in fit and capacity, even though the cup letter is the same.
When comparing bras, brands or sizes, always consider both band size and cup size together.
This difference is not related to quality or support — it is simply the result of using different cup letter progressions. Both systems are valid UK sizing methods.
UK Brands That Make G Cup Bras
G cup bras are widely available across UK fuller-bust brands, but availability still depends on band size and brand sizing structure. The brands below show each brand’s full UK band and cup size range, based on their official size charts.
- Bravissimo – Bands 28–40, cups D–L View size guide
- Freya – Bands 28–42, cups B–K View size guide
- Panache – Bands 28–46, cups B–K View size guide
- Elomi – Bands 32–48, cups B–LL View size guide
- Sculptresse – Bands 34–46, cups D–K View size guide
- Goddess – Bands 32–56, cups B–K View size guide
G Cup Band Sizes by Brand
- Bravissimo: 28G, 30G, 32G, 34G, 36G, 38G, 40G
- Freya: 28G, 30G, 32G, 34G, 36G, 38G, 40G, 42G
- Panache: 28G, 30G, 32G, 34G, 36G, 38G, 40G, 42G, 44G, 46G
- Elomi: 32G, 34G, 36G, 38G, 40G, 42G, 44G, 46G
- Sculptresse: 34G, 36G, 38G, 40G, 42G, 44G, 46G
- Goddess: 32G, 34G, 36G, 38G, 40G, 42G, 44G, 46G, 48G, 50G, 52G, 54G, 56G
G Cup Volume Changes With Band Size
Many people assume that all G cups are the same size. In reality, cup volume increases as band size increases. A 38G holds more volume than a 34G, while a 30G holds less.
The cup letter stays the same, but overall cup volume increases as the band size increases.
These simplified educational diagrams show how cup volume changes as the band size increases, even when the cup letter remains G.
A bra size consists of both the band size and cup size. A 38G holds more cup volume than a 34G, while a 30G holds less, despite all three using the same cup letter.
Popular G Cup Bras (UK Sizing)
Below are selected G cup bras in UK sizing from fuller-bust specialist brands. These examples show styles commonly available in G cup sizes across a range of band sizes. If you are still confirming your size, see the fitting advice and sizing information further down this guide before purchasing.
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How to Find Your Correct G Cup Size
Measure your underband and bust carefully, then enter your details into our Bra Size Calculator.
For step-by-step measuring guidance and fit checks, visit our Bra Fitting Advice.
Common Fit Issues for G Cup Bras
- Band riding up at the back (often means the band is too big)
- Cups gaping (often shape-related, not always “too big”)
- Spillage at the top edge (often means the cup is too small)
- Wires sitting on breast tissue at the sides
- Straps digging in or slipping off
If your G cup fit feels inconsistent, try another style within the same brand or compare brands using our Bra Size Converter.
Can I Sister Size Instead of Wearing a G Cup?
Sister sizing can help if your exact size is unavailable in a specific style, but it should be used carefully. If you go up a band size, you usually need to go down a cup size to keep a similar cup volume (and vice versa). However, sister sizes can change where wires sit and how the bra supports you, especially across different shapes.
G Cup Sister Size Example
When sister sizing, the band size changes while the cup volume stays similar. A common G cup example is:
These sizes have a similar cup volume, but different band lengths.
Sister Size Comparison
These diagrams provide a simplified visual example of sister sizing. While the band size changes, the overall cup volume remains broadly similar.
Sister sizes can help when your usual size is unavailable. As the band size increases, the cup letter decreases to maintain a similar cup volume.
For a full explanation of how sister sizing works, see our Bra Sister Sizes Guide .
Use our Bra Size Converter to compare UK brand sizing and sister sizes accurately.
Explore More G Cup Guides
If you want to compare G cup sizes in more detail, these related guides can help you understand cup volume, band size, sister sizing and neighbouring cup sizes.
- G Cup Bras by Band Size
- How Big Are G Cups?
- F vs FF vs G Cup Size Comparison
- G vs GG vs H Cup Size Comparison
- Bra Sister Sizes Guide
G Cup Bra FAQs
Do all brands use the same G cup sizing?
No. While G cup is a recognised UK size, brands use different cup letter sequences.
Traditional brands use a shorter progression, while fuller-bust brands use extended sequences that include FF and GG cups.
Is a UK G cup the same as a US G cup?
No. US sizing uses a different cup structure.
A US G cup is smaller than a UK G cup from extended UK sizing brands.
Always use conversion charts rather than relying on the letter alone.
Does band size affect G cup volume?
Yes. Cup volume increases with band size.
A 38G holds more volume than a 32G.
Can G cup bras be supportive without wires?
Some non-wired styles exist, but most G cup wearers get better lift and support from underwired bras.
Related Cup Size Guides
For background information on bra sizing systems, see the bra size reference on Wikipedia .