I want to know what cc will take me from a 34b to a 34dd? (Photos)

Thank you for your question and photos.  Unfortunately, it is impossible to tell you an exact implant size that would give you the results you are looking for.  The best thing to do is schedule an in person consultation with a board certified plastic surgeon.  There you will have the opportunity to try on the implant sizers and decide which size you like best on your body.  There are also other factors that go into such as your chest dimensions and measurements.  There are so many options these days, that I'm sure you will be able to find what you are looking for, but without a consultation, I cannot tell you exactly.  However, to give you an idea, generally speaking approximately 200cc is about a full cup size, but that is purely an estimate.If you would like more information and resources regarding breast augmentation you can download a free copy of my breast augmentation planner at aBetterBreast.com. 

Thank you for your question and photographs.  Breast implant selection is an exciting, but stressful part of the breast augmentation process as there are so many choices. Unfortunately it is impossible to recommend the best implant style, size or shape without an in-person examination that allows for the measurement of key breast parameters, as well as permits an in-depth discussion as to your desired goals and outcome. I would recommend seeing an ASPS board certified plastic surgeon, they are in the best position to ensure that the implants the two of your decide upon are the right ones to meet your expectations.  It sounds as if it may be wise for you to "try on" several of the implants so that you can have a better visual representation as to what they would look like.  Best wishes!

Patients often think in terms of cup size when considering augmentation. Unfortunately, devices are sized in terms of milliliters (cc) of volume. This can lead to some confusion when sizing. Additionally, it is important to remember that cup size itself is not standardized with variations from one manufacturer to another. Unfortunately, as many women can attest their cup size in an industry leader such as VS is not necessarily transferable to another brand.
Another point which is often under appreciated is that of anatomy and starting point. Any implant will add volume to the volume which is already present. The implant is additive. A particular volume will not necessarily confer the same cup size to different patients (often times it will not even confer the same cup size to different breasts in the same individual...remember they are "sisters" not "twins"). 
A general rule of thumb is that 125cc can represent somewhere between 1/2 to a full cup size increase. Smaller volume differentials (25-50cc) are typically less consequential representing a volume change of less than a shot glass. However, I have found these numbers, at least anecdotally, to be of little help. Patients often present with notions/goals which do not correlate with these sorts of sterile volumetric assessments.
When sizing patients, there are a number of useful tools including:
-3D imaging (has the added benefit of offering a volumetric analysis of the pre-operative breast)
-Breast sizers (rice bags)
-Goal photos
I also recommend that patients commit to a particular look rather than a cup size. Once a patient settles on a look that pleases them the overall cup size increase becomes less relevant.With regards to your specific question, there is very little that can be said without an in-person exam/consultation. Your board certified plastic surgeon is uniquely qualified to guide your decision making process taking into consideration your goals and expectations as well as the unique anatomic measures/qualities that define you (breast width, native breast tissue, skin elasticity etc.)
As always, discuss your concerns with a board certified plastic surgeon.