The cup size can be calculated using the difference between bust size and band size. Refer to the table below for some size measurements, though some variation from the published measurements is possible. However, band sizes come in different measurements in different countries, in that sizes such as small, medium, and large, equate to different measurements. The band size is the size of the bra band around the torso. The two major aspects of bra size are the band size and the cup size. Some signs of incorrectly fitted bras include the band digging into the torso or sliding upwards, red marks, shoulder or neck pain, the breasts overflowing around the edges of the bra, and the bra's center panel not lying flat against the breast, among others. A 34B bra from two different companies, for example, may not fit the same person because of this lack of standardization. These vary largely between countries, and even manufacturers, making it difficult to use these measures as anything more than an approximate fit. Part of the issue is the lack of standardization regarding band and cup sizes.

Studies have revealed that the most common mistake made by women when selecting a bra was to choose too large a back band and too small a cup. This application helps you to calculate and adjust the right bra size, based on bust measurements.

While data collection methods between various sources is not consistent and these percentages may be inflated, incorrectly fitted bras are nonetheless a significant issue, evidenced by the number of studies, articles, and complaints surrounding the issues women face due to a lack of size standardization.

Surveys and studies often cite that anywhere between 70-85% of women wear incorrectly fitted bras.

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