What cup size approximately will I be if I add 500cc to my already 36C breasts? (Photo)

Great question!  Without seeing you in person its hard to give an accurate recommendation but 500cc's seems quite big for someone who's already a C.  As a general estimate, which can vary from person to person, 200cc's is about 1 cup size - so 500cc's is 2.5 cups bigger than you are now, which will definitely put you past the D cup size.  Your surgeon should be able to provide you sample implants  or imaging for you to try on and see how they would look with the size they chose.  If your surgeon cannot do this, then I would highly seek a secondary consultation with someone who can give you a better idea of what the sizing looks like.  I spend a long time with all my consults about sizing, and we have a sizing system where patients try on different implants in a bra and t-shirt so they can see what the final result will look like - you need to do this as well.Best of luck and hope this information helps!
- Dr. Roger Tsai  @DrRogerTsai
Board Certified Plastic Surgeon

Hello, thank you for your question. I recommend you to discuss this with your board certified plastic surgeon, measurements of the chest wall and breast imprint width as well as knowledge of all breast implant sizes and profiles should make this process easy. Try on a profile bra with various silicone moderate and HP sizers starting at the number of ccs your PS recommends under a tailored blouse, tight sweater, swimsuit, workout clothes, and other garments you typically wear so that you have the best idea of whether the garments fit as desired with the implant selected. Work your way up or down from that size to determine the size that boosts your self-esteem, and fits your anatomy.  Choosing an implant based on an aesthetic goal that exceeds your anatomic capacity may lead to complications and possibly revision.

My best advice: more communication.
It is definitely worth spending more time (prior to the date of surgery) with your plastic surgeon to discuss further.  As you know, it will be important for many reasons, that you feel comfortable that you and your plastic surgeon are on the "same page" prior to proceeding.There is no accurate/reliable/predictable correlation between size/profile breast implant utilized and cup size achieved. For example, I do not think that the generalizations of "200 cc equates to 1 cup" hold any validity or are helpful in any specific or practical way.  In my practice, I ask patients not to communicate their goals, or evaluate the outcome of the procedure performed, based on cup size references.
One question that might be helpful for you to consider: would you be more disappointed if you are slightly too big or slightly too small after the breast augmentation procedure?
Ultimately, careful communication of your goals (in my practice I prefer the use of goal pictures, direct examination/communication in front of a full-length mirror, in bra sizers, and computer imaging) as well as careful measurements (dimensional planning) will be critical.
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 "large D cup” etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him 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 helps. Best wishes for an outcome that you will be very pleased with.