100cc=1 cup size if measuring a 32?

Thank you for the question. There is no accurate/reliable/predictable correlation between size of breast implant utilized and cup size achieved.  
Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery ( regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals.
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. For example, I have found that the use of words such as “natural” or "C or D cup” etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup size may also be inaccurate. Again, the use of computer imaging has been very helpful during the communication process, in our practice.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery, after the use of temporary intraoperative sizers.
I hope this (and the attached link, dedicated to breast augmentation surgery concerns) helps. Best wishes.

Dear Philadelphian,       Chest and breasts circumference measurement is critical fo selecting the correct implants size. Other two important factors are your desire and your tissue elasticity. It is important that the measurements are taken by your surgeon. I have been in plastic surgery practice for over 28 years and performed breasts augmentation with implants on thousands of patients. In my experience, for a patient with chest circumference of 32 inches, the amount of volume needed for one size increase is, roughly, 125 cc. That can be either saline ( my preference ) or Silicone. For 34 inches chest circumference it is 150 cc , so on and so forth. Always, consult with experienced board certified plastic surgeon who operates in accredited surgery center for your safety. Check the before and after pictures to make sure that they are numerous, consistent and attractive. Pay special attention to the cleavage area, the perkiness, the symmetry and the natural look.              Best of luck,                                     Dr Widder