Women's underwear models are generally composed of bra size and cup size, bra size is expressed in numbers, referring to the size of the lower bust, the unit has centimeters and inch size of the British system, the lower bust size is converted to: 70CM = 32; 75CM = 34; 80CM = 36; 85CM = 38; 90CM = 40; 95CM = 42. The code when you buy a bra may show 34

The letters ABCD are cup sizes, which are determined by the depth of the breasts, and are the result of subtracting the circumference of the breast at the highest point of the breast from the length of the lower circumference of the breast, and subtracting the length of the lower circumference of the breast from the upper circumference of the breast. That is, the upper bust minus the lower bust. The difference between each cup is 2.5 centimeters, starting at 7.5 centimeters for AA cups, 10 centimeters for A cups, 12.5 centimeters for B cups, and so on, 15 centimeters for C cups, 17.5 centimeters for D cups, and 20 centimeters for E cups.

Refer to the table:

Expanded information:

Measurement, the body of the measured person is upright, the two arms are naturally hanging down, measurement of adult women, the measurements will be placed horizontally on the tape measure in the lower corner of the two shoulder blades, placed in the front of the fourth ribs and the sternum of the joints, measuring The circumference of the thorax was measured in one week, firstly during quiet time, then during deep inhalation, and finally during deep exhalation. Deep inhalation and deep exhalation of the difference between the chest circumference is called the respiratory difference, can reflect the function of the respiratory organs, the general adult respiratory difference of 6-8 centimeters, the respiratory difference of the regular exercise up to 10 centimeters or more, in the measurement, attention should be paid to let the person do not shrug his shoulders, and do not bend over when exhaling.

The average chest circumference at birth is about 32cm, which is 1~2cm smaller than the head circumference; the chest circumference is equal to the head circumference at about 1 year old; after 1 year old, the chest circumference should gradually exceed the head circumference, and the growth curve of the head circumference and the chest circumference forms a cross. It is said that this cross, its time and children's nutrition and the development of the thorax is related to the poor development of the cross delayed. China's 1985 survey showed that the average time of the boy's head and chest cross is 15 months old, suggesting that the thoracic development of our children lag behind, in addition to nutritional factors, it is likely that do not pay attention to the upper limbs and thoracic exercise.