I'm 5'4 a 140 Lbs Currently 36b How Big Would 450cc Make my Breast?

There is no exact correlation between implant volume and cup size, but a 450 cc implant should bring you to a D cup if you are a B cup now. On average about 150-200 cc will add a cup size in most women (less than a cup if you have a broad chest), so 450 cc should bring you about 2 cup sizes larger. The cup size is also dependent on the brand of bra. Talk to a board certified plastic surgeon in detail about what you want. It helps to bring photos in addition to simply talking cup size.

Without actually examining you it is impossible to say exactly what cup size you would be.  Rather than worrying about what bra size you would be, I strongly recommend that you try the breast implant sizes on in your surgeons office and make sure that you pick the perfect look for you, regardless of bra size.  Good luck.

A 450 mL implant will probably leave you with a full D cup. This may or may not be what you are interested in. I would suggest you get a 450 mL Sizer and try it in your bra.