Will 400cc Implants Give Me a Full C or Small D Cup?

Hello,
Identical breast implants do look different on different women. Trying to judge cup size based upon a few written measurements makes hazarding a guess even more chancy. Different surgeons use different measurements to optimize their predictions.
This is one to ask in the office with your surgeon.

There is not a direct correlation between breast implant size and cup size as the cup size varies greatly among companies and even within the same company. Moreover, cup size can vary based on who is performing the measurement. The size of the implants are based on a combination of a patient's goals and objectives and her anatomy. In order to provide a natural looking augmentation, the surgeon needs to evaluate many factors including soft tissue coverage, skin laxity, chest wall width, breast imprint width, the shape of the breasts and relative level of constriction to ensure that the breast implants are appropriate for your body.Consult in person with 3 experienced and expert board certified plastic surgeons to understand your options.

In order to make an accurate size recommendation, I would need to assess your chest wall and breast mound measurements and characteristics.  Unfortunately, there is not a general rule of thumb or objective criteria to implant selection.
Your plastic surgeon will perform several measurements of your chest wall and breast anatomy and determine a range of implants that both fit your chest wall and reach your desired goals.
The next step is to try on this range of implants in the office with your doctor.   The key to this success is showing your surgeon the body proportion you desire with a bra sizer and allowing your surgeon to guide you to the right implant.   It will be much easier to communicate in implant cc's than cup size when determining the appropriate implant for you.
I wish you a safe recovery and fantastic result.
Dr. Gill

When ever you talk about bra sizes you have to realize it is not an exact science. Different manufactures have very different sizes and shapes so one manufacture may consider you a C and another manufacture will consider you a D. The cup size of a 32 C is very different than a C cup of a 38 bra. With all of this in mind, we still have a general idea of what you are asking.
With the information you have given in regards to height and weight and starting bra size it sounds like the 450 cc implants will be about right. One way to help confirm this is to try on some implants and see if this is close to the size you are looking for. No one can guarantee you to be a certain bra size but it sounds like you are real close.
Best Wishes
Dr. Peterson

The breast cup designation is often variable between bra manufacturers and depends likewise on chest wall inch measurements. With this in mind, prediction of outcome can be somewhat hazy. From your measurements the volume you quote sounds reasonable. Don't forget, there are different profile implants that may also have a bearing on cup outcomes. Discuss this with your surgeon.
As far as pre operative prediction, try placing the implants in a non padded bra with a T shirt or similar over. This gives a rough idea keeping in mind that externally, the implant will be approximately 50 cc smaller that the implant required for the augment when placed in the body. Perhaps even 75 cc if sub-muscular.
Hope this helps!