DDD vs F Cup
US DDD is UK E and EU F: six inches. Some US brands print F for DDD; a UK F is one step larger.
Same inches, three names
| Bust − band | US | UK | EU |
|---|---|---|---|
| 3″ | C | C | C |
| 4″ | D | D | D |
| 5″ | DD | DD | E |
| 6″ | DDD | E | F |
| 7″ | G | F | G |
| 8″ | H | FF | H |
| 9″ | I | G | I |
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.
DDD vs F: answered
Is a DDD cup the same as a F cup?
US DDD is UK E and EU F: six inches. Some US brands print F for DDD; a UK F is one step larger.
Which is bigger, DDD or F?
Depends on the system: US DDD is UK E and EU F: six inches. Some US brands print F for DDD; a UK F is one step larger.
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.
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 →