Bra size is composed of two dimensions; the band size and the cup size:

BAND SIZE

 

The band size is measured numerically e.g. 30, 32, and 34…etc. and refers to the size of the rib cage.

CUP SIZE

 

The cup size is measured alphabetically e.g. A, B, C, D, E, F… etc. and refers to the size of the breasts in relation to the rib cage i.e.how much bigger the breasts are than the rib cage.

It is important to note that the cup size doesn’t represent volume, but instead represents how much bigger they are than the rib cage. Breast size cannot be determined by the cup size alone as it is affected by the band size. For example, D cup breasts on a 28 band are smaller in volume than D cup breasts on a 40 band.

SISTER SIZES
Bra sizes that are the same in breast volume are often referred to as “sister sizes”. The table below shows a range of bra sizes. The cells that are diagonally adjacent from the top right to the bottom left (e.g. the grey cells) are the same in breast volume but across different circumferences i.e. the same volume of breast tissue spread across different size rib cages.

26D26DD26E26F26FF26G26GG26H26HH
28D28DD28E28F28FF28G28GG28H28HH
30D30DD30E30F30FF30G30GG30H30HH
32D32DD32E32F32FF32G32GG32H32HH
34D34DD34E34F34FF34G34GG34H34HH
36D36DD36E36F36FF36G36GG36H36HH
38D38DD38E38F38FF38G38GG38H38HH

Sisters sizes demonstrate that if your bra cups fit your breasts perfectly but you need a different band size (because it is too tight or too loose), you will need to change the cup size as well to achieve the came fit in the cup. For example, if a woman who normally wears a 36D finds that the band is too loose but the cups fit perfectly, she will need to try a 34D to gain the same cup volume.

 

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