<P> Bra - wearers can calculate their cup size by finding the difference between their bust size and their band size . The bust size, bust line measure, or over-bust measure is the measurement around the torso over the fullest part of the breasts, with the crest of the breast halfway between the elbow and shoulder, usually over the nipples, ideally while standing straight with arms to the side and wearing a properly fitted bra . This practice assumes the current bra fits correctly . The measurements are made in the same units as the band size, either inches or centimetres . The cup size is calculated by subtracting the band size from the over-the - bust measurement . </P> <P> Cup sizes vary from one country to another . The larger the cup size, the bigger the variation . </P> <Table> Over the bust / band measurement difference and cup size <Tr> <Td> Difference </Td> <Td> (inches) </Td> <Td> <1 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 6 </Td> <Td> 7 </Td> <Td> 8 </Td> <Td> 9 </Td> <Td> 10 </Td> <Td> 11 </Td> <Td> 12 </Td> <Td> 13 </Td> <Td> 14 </Td> <Td> 15 </Td> <Td> 16 </Td> <Td> 17 </Td> </Tr> <Tr> <Td> Cupsize </Td> <Td> U.S. </Td> <Td> AA </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> DD / E </Td> <Td> DDD / F </Td> <Td> DDDD / G </Td> <Td> </Td> <Td> </Td> <Td> J </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Cupsize </Td> <Td> UK / Austr . </Td> <Td> AA </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> DD </Td> <Td> </Td> <Td> </Td> <Td> FF </Td> <Td> </Td> <Td> GG </Td> <Td> </Td> <Td> HH </Td> <Td> J </Td> <Td> JJ </Td> <Td> </Td> <Td> KK </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> Difference </Td> <Td> (inches) </Td> <Td> <1 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 6 </Td> <Td> 7 </Td> <Td> 8 </Td> <Td> 9 </Td> <Td> 10 </Td> <Td> 11 </Td> <Td> 12 </Td> <Td> 13 </Td> <Td> 14 </Td> <Td> 15 </Td> <Td> 16 </Td> <Td> 17 </Td> </Tr>

What is the difference between a size d and dd bra
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