brasize.ai
Calculate
Cup comparison

G vs F Cup

A US G is a seven-inch cup and equals a UK F and an EU G. A UK G is nine inches: two steps larger than a US G.

The alphabets

Same inches, three names

Bust − bandUSUKEU
3″CCC
4″DDD
5″DDDDE
6″DDDEF
7″GFG
8″HFFH
9″IGI

Read the system, not the letter. Above D, US repeats D (DD, DDD), the UK doubles alternate letters (DD, E, F, FF, G, GG), the EU just continues (E, F, G). Convert exactly with the size converter.

On a band

G vs F on the same body

Every cup letter is relative to its band. The guides below show each cup across every band, with the sister sizes that hold the same volume.

Answered

G vs F: answered

Is a G cup the same as a F cup?

A US G is a seven-inch cup and equals a UK F and an EU G. A UK G is nine inches: two steps larger than a US G.

Which is bigger, G or F?

Depends on the system: A US G is a seven-inch cup and equals a UK F and an EU G. A UK G is nine inches: two steps larger than a US G.

Why do cup letters differ between countries?

US, UK and EU sizing all measure the same inch difference but continue the alphabet differently above D.

Shop itAt HauteFlair, our sister retailer

Opens HauteFlair’s own hub page; use your measured size there. HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.

Find your cup, in every system

Two measurements, then the letter in US, UK and EU.

Calculate My Bra Size →