Numbers represent your lower bust size, and the letters "75" and "80" in the above example refer to your lower bust size table size. The length of a circle horizontally around the bottom of the breast is your bust size in CM. For convenience, when buying a bra, we often choose a similar approximate figure as our bra size according to our bust.

For example, if your lower bust is between 68 cm and 72 cm, please choose size 70. Please refer to the bra size table and bust size table for details. These letters are your cups. The "B" and "C" in the above example are your breast cups. The calculation formula of cup is: cup size = upper bust size-lower bust size.

Extended data:

Measuring cup method:

The size of the cup is the difference between the upper bust minus the lower bust. According to the measurement result of step 1, the cup size is determined by the difference between the bust size and the lower bust size.

Generally speaking, the difference is about 10CM, a cup, b cup, c cup, d cup, e cup and f cup.

For example, the bust is 85 cm and the lower bust is 70 cm. Then 85-70= 15 cm. Then you should choose a 70C bra, and 70 is the lower bust size to determine the model.

Note: everyone's bra size will be slightly different due to different figure.

References:

Baidu encyclopedia-bra size comparison table