Rylee92,There is no formula for choosing implant size and geometry, as a lot has to do with the existing breast volume, breast base dimensions, location of your breasts on the chest wall, and then your personal desires. This includes how natural versus how obviously augmented you wish to appear. You will find that there is a range of effective volumes for each patient, below which the breast will not be adequately filled and will not reach its best shape potential (least effective volume), and beyond which the breasts will give up natural shape for the sake of additional outcome volume (maximum effective volume).Additional volume can be added beyond the maximal effective volume, but will transform the shape to a less natural-appearing roundness and then on to a completely fake-looking shape, eventually reaching a point where the addition of further volume requires destruction of internal muscle and fibrous support structures, and breach of breast landmarks (mainly the folds), which in some patients will lead to double fold contour deformity, bottoming-out, symmastia etc. Implant Sizing schemes with, external implants in a bra, may be of some help, but can be misleading if an implant volume and width is desired that is beyond the capacity of the breast fold geometry, particularly if there is mild skin overhang over the lower pole fold (dedicated fold geometry). I find that bringing photos of similar shaped women's results can help in the discussion, but realize that photos can only be used as a theme for what you are looking for, and not like a catalog from which exact sizes and geometries can be ordered. I hope that this helps a little, as this is a complex issue. Study this well and ask informed questions, even on the day of surgery, as it will help in the process, and limit the chance of dissatisfaction.