A80 is a cup, and the cup size is 10cm. It means that the upper bust is 90cm, the lower bust 100cm, the difference between the upper bust and the lower bust 10cm, and the European size 36A.

Calculation formula of cup size: cup size = bust-lower bust.

Extended data

Generally speaking, A cups are divided into type A and type AA. If the figure obtained by subtracting the bust from the lower bust is about 7.5cm, then the bust of this girl is AA cup. If the number obtained by subtracting the two is about 10cm, then the girl's bust is a cup. When wearing underwear, girls with A cups and AA cups can adjust by adjusting the buttons behind the bra straps.

A cup also has a certain size range and is not fixed. If the cup is described by fruit, it is appropriate to use cherry as a metaphor, and it can also be described by the small fist of an ordinary girl.

Baidu Encyclopedia: Cup