This is a question that we are asked frequently during our consultations. There is no 'correct' answer as each person has individual preferences and an overall comfort level for their body. That having been said, the ideal breast size is compatible with the general body structure of the person. Height, rib cage width, hip width play an important role in the ideal breast size. This is called the golden ratio. This golden ratio is important in terms of aesthetics, naturalness and comfort of the person. From your photos, you are very fit and have great starting overall breast shape. There is no sagging nor structural issues such as breast constriction, tuberosity, etc. The issue is 'volume' meaning how big to go. As a general rule, it takes about 200 cc per cup size increase. It appears that you are closer to a small B. So, a 300 cc implant would be expected to give you a one and a half cup increase to a full C/small D cup. In your consultation, as with other board-certified plastic surgeons, we would measure your breasts and torso. We would then give you appropriately sized implants to try on at different volumes. In this way, you would have a very good understanding of what to expect. It would allow you to 'test drive' the implants. I believe that you will be very happy with whatever size (or not) that decide upon. Respectfully, Jules A Feledy, Jr, MD American Board of Plastic Surgery, American Society of Plastic Surgery