How big are 400cc implants?

Thank you for your question.  When choosing an implant size there are a few factors that come into play.  Nipple to crease distance, width of the breast and depending on the amount of breast tissue will determine the end cup size when adding an implant.  Without an in person exam it is hard to determine what a 400cc implant will do to your cup size.  I would suggest seeing a Board Certified Plastic Surgeon in person to evaluate you and discuss your options.  Best of luck to you. 

Hello and Great Question. I appreciate the time you are spending researching this procedure. My name is Dr. Matthew J. Nykiel. I am a Board Certified Plastic Surgeon, a Fellowship Trained Cosmetic Surgeon, and a Breast Augmentation Specialist
400 cc implants can look different on everyone, depending on your current measurements and what your body goals are will determine if that size is good for you, I would definitely recommend doing an in person consultation with a board certified plastic surgeon who specializes in this procedure and who can suggest what is needed. 
I hope that helps! Best of 
Luck! 
Matthew J. Nykiel MD