Why do cup sizes vary between UK bra brands?

All UK bra sizing follows the same 1-inch rule, but brands use different cup letter sequences. This means the same cup letter can represent different volumes depending on the brand.

Does band size affect cup volume?

Yes. Cup volume increases as band size increases, so a 38 cup holds more volume than the same cup letter on a smaller band.

Is UK bra sizing the same as US or EU sizing?

No. UK, US and EU sizing systems use different cup progressions. Always use a conversion chart when comparing sizes across regions.

Bra Size Guides

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.

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

Although G cup is a recognised UK bra size, the letter alone does not represent one fixed volume. This is because different UK cup letter sequences are used by different brands, even though the underlying sizing rule is the same.

Traditional UK brands, including Triumph, follow the long-established cup sequence: B, C, D, DD, E, F, G, H, J, K.

Many fuller-bust specialist brands, such as Freya, Panache and Elomi, use an extended UK cup sequence that includes additional double letters: D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, KK, L, LL.

Each step in the UK cup size sequence represents a 1 inch increase in the difference between the underband and the fullest bust measurement. This rule applies to all UK brands, regardless of whether they use a traditional or extended cup letter sequence.

The only difference between brands is how those 1-inch steps are labelled. Traditional-sequence brands move directly from F to G to H, while extended-sequence brands include additional steps such as FF and GG. The measurements increase in exactly the same way — only the letters change.

This difference is not related to quality, support or construction. It is simply the result of using different cup letter progressions. Both systems are valid UK sizing methods, but they are not interchangeable by letter alone.

If you are unsure how this size compares to neighbouring cups, see our guide explaining F vs FF vs G cup size differences.

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 .

Important:
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

Browse G Cup Bras by Band Size

If you already know your band size, you can browse our detailed recommendations for each G size below. Each page includes fit guidance and carefully selected everyday styles.

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.

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 .