How much would it cost and how many cc are need to go from 34b to 34d breast implants ?

Dear imperfect,   Front and side view pictures would have been very helpful. If indeed you are 34 B cup size, you will need 300 cc to become 34  D cup. However, your true size will have to be taken by your surgeon who will measure the circumference  of your breasts and chest, in inches.   I have noticed in my over 29 years of experience, that many women over estimate their breasts size, because Victoria secrets make the bra cup size smaller, so women feel better about their breasts size. So, if you are, in reality, 34 A cup size, you will need 450 cc implants to become 34 D cup size.  As far as the cost, breasts augmentation surgery (no lift)  with smooth , round moderate profile saline implants made by Mentor (99.9% of my patients) cost in my  surgery center $5500. The price includes accredited surgery center, board certified plastic surgeon, operating room, recovery room, implants and standard post operative follow up visits.   You have to realize that cost is important , but quality of surgeon is more so, because if corrective surgery is necessary, the total cost of surgery will escalate dramatically. So, do your due diligence carefully and choose your surgeon wisely, to avoid bad result and need for redo surgery.    Always, consult with experienced board certified plastic surgeon who operate in accredited surgery center for your safety. Most importantly, check the before and after pictures in the photo gallery, to make sure that they are numerous, consistent and attractive with nice cleavage, perky, symmetrical and natural looking.                              Best of luck,                                                  Dr Widder

Thank you for the question.  There is no accurate/reliable/predictable correlation between size/profile breast implant utilized and cup size achieved.  Ultimately, careful selection of plastic surgeon and 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, and computer imaging) 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. I have found that the use of words such as  “natural” or "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.When it comes to costs of surgery, there may be many “variables” involved. The specific surgeon's credentials/experience level (or lack thereof), the specific geographic area you are looking at, the different operations available, the location of the procedure (quality of surgery facility), type/quality of anesthesia provide, type of breast implants… are some of the potential variables involved. You will find some average costs of surgery on this website and on individual plastic surgeons' websites as well.
I hope this (and the attached link, dedicated to breast  augmentation surgery concerns) helps. Best wishes.