How many CCs does to take to get from an A cup to a D cup?

I'm assuming that an A cup to D cup breast augmentation can be done, but wouldn't that require 500 ccs or more? I've been reading that there is no actual correlation between the number of CCs and the cup size, so now I'm totally confused. How can the same-sized implant give one woman more volume than another?


F, 48, Ontario