G cup bra size: a US G and a UK G are two cups apart
A G cup is not one size. On US ladders (Wacoal, Freya, Elomi) G is seven inches of difference, which the UK calls F. On UK ladders G is nine inches, which the US calls I. Two cups apart, 5.1 cm of difference, under the same letter.
US G: 7 in, 17.8 cm of difference
| UK | US | EU | FR | AU | JP (approx.) |
|---|---|---|---|---|---|
| 32F | 32G | 70G | 85G | 10F | H70 |
| 34F | 34G | 75G | 90G | 12F | H75 |
| 36F | 36G | 80G | 95G | 14F | H80 |
| 38F | 38G | 85G | 100G | 16F | H85 |
| 40F | 40G | 90G | 105G | 18F | H90 |
| 42F | 42G | 95G | 110G | 20F | H95 |
UK G: 9 in, 22.9 cm of difference
| UK | US | EU | FR | AU | JP (approx.) |
|---|---|---|---|---|---|
| 32G | 32I | 70I | 85I | 10H | n/a |
| 34G | 34I | 75I | 90I | 12H | n/a |
| 36G | 36I | 80I | 95I | 14H | n/a |
| 38G | 38I | 85I | 100I | 16H | n/a |
| 40G | 40I | 90I | 105I | 18H | n/a |
| 42G | 42I | 95I | 110I | 20H | n/a |
"g cup bra" gets about 6,600 Google searches a month in the US, 1,300 in the UK and 590 in Australia; "g cup breast size" adds 9,900 in the US. Google Ads cluster figures, September 2026.
Which G is on the tag
The letter is the same; the size behind it depends on the ladder the brand uses. Each reading, and who prints it.
| Reading | Difference | UK | US | EU | AU |
|---|---|---|---|---|---|
| US G | 7 in (17.8 cm) | 34F | 34G | 75G | 12F |
| UK G | 9 in (22.9 cm) | 34G | 34I | 75I | 12H |
- US G. Wacoal, Freya and Elomi print US G next to UK F. Seven inches of difference.
- UK G. The UK ladder runs F, FF, G, GG, H: G is the ninth inch, and the US calls it I (Wacoal, Freya, Elomi). Marks & Spencer's UK G on band 32 is printed with a US I.
Sister sizes keep the G cup's volume
Go down one band and up one letter, or up one band and down one letter, and the cup volume stays the same. Shown for US G on a 34 band.
| UK | US | Compared with 34F |
|---|---|---|
| 32FF | 32H | Tighter band, 1 letter up |
| 34F | 34G | This size |
| 36E | 36DDD | Looser band, 1 letter down |
The full diagonal chart, with fit fixes for a band that rides up or digs in, is on the sister sizes page.
What the +4 method does to this cup
The traditional method adds 4 inches to an even underbust and takes the cup from what is left. For US G (7 in) that changes the answer on every band.
| Underbust | Bust | Measured band | +4 method (US) |
|---|---|---|---|
| 32 in | 39 in | 32F | 36C |
| 36 in | 43 in | 36F | 40C |
| 40 in | 47 in | 40F | 44C |
White and Scurr (2012) found the traditional method overestimated band size and underestimated cup size (Ergonomics 55(6)). A size from an older calculator may not be the size on this page.
Which charts list it
The bands on which each brand's own printed chart lists this cup. A chart check, not a stock check.
| Brand | US G (7 in) | UK G (9 in) |
|---|---|---|
| Elomi | 32 to 48 | 32 to 48 |
| Freya | 28 to 44 | 28 to 44 |
| Marks & Spencer | 30 to 46 | 30 to 46 |
| Victoria's Secret | not on its chart | not on its chart |
| ThirdLove | 32 to 44 | not on its chart |
Elomi: US underband and cup sizing, 32 to 48 bands and B to O cups (UK B to K; its chart continues to UK KK). Freya: bands 28 to 44, UK cups B to K. Marks & Spencer: its UK row lists sizes from 28AA to 46K (no FF, HH or JJ); matched here by the label as printed. Victoria's Secret: international chart: bands 30 to 44, AA to DDD (UK E). ThirdLove: bands 32 to 44, AA to H in US letters (UK FF), plus half cups.
What is particular about the G cup
Which G is on the tag
A US 34G is 34F in UK labels, EU 75G. A UK 34G is US 34I, EU 75I. If the brand sells in US sizing (Elomi, Fantasie and Freya say they do), read G as the seven-inch cup; if it is a UK brand, read it as nine.
SKIMS pairs G with two different cups
SKIMS's own cup table pairs its US G with UK G (nine inches on the other ladders we read) and EU H (eight). A SKIMS G cannot be converted with a general chart: use its chart.
Three answers in Australia
A UK G is an AU H on Berlei's ladder, which skips FF and GG, an AU G on Freya's and Elomi's charts, which repeat the UK letters, and an AU FF on Marks & Spencer's table. See the Australia section of the international size chart.
What the +4 method does to a seven-inch G
A 36 in underbust and a 43 in bust measure 36F, the US G. The +4 method pads the band to 40 and gives 40C. For the nine-inch UK G, 36 in and 45 in, it gives 40DD against 36G.
Other sizes and tools
- Bra size calculatorMeasure your size with both methods shown
- UK to US converterAny size in any of six systems
- Sister size chartThe full diagonal chart and fit fixes
- A cupWhat the letter means, by band
- B cupWhat the letter means, by band
- D cupWhat the letter means, by band
- DD cupWhat the letter means, by band
- E cupWhat the letter means, by band
- H cupWhat the letter means, by band
Sources
Each source was opened and checked on the date shown, or on 25 September 2026. Where sources disagree, the page says so instead of picking one silently.
- Wacoal America, "Size Charts": US and UK cup ladders side by side (opened 26 September 2026)
- Freya, "International Bra Size Chart & Bra Sizing": band and cup tables in UK, EU, FR, AU/NZ, US and JP (opened 26 September 2026)
- Elomi, "International Size Guide": US underband and cup sizing, B to O cups and 32 to 48 bands; UK, EU, FR, AU/NZ, US and JP rows (UK cups to KK, US to P) (opened 29 September 2026)
- Fantasie, "International Size Guide": US underband and cup sizing; the Merissa non-wired bikini top and swimsuit chart from bra size to XS to XXL (opened 29 September 2026)
- SKIMS, "Bra Size Guide": underband and overbust chart, sizes 30AA to 46H, US/UK/EU/AU cup table (opened 26 September 2026)
- Marks & Spencer US, "Bras size guide": UK, AU/NZ, US/CA, EU and FR conversion table (opened 26 September 2026)
- Berlei Australia, size charts: AU band = underbust row, cups A to H with no FF or GG
- Wikipedia, "Bra size": UK and US cup ladders, the +4 method, EN 13402 and JIS cup steps