150cc is the equivalent to roughly a cup size – depending also on the size (width) of your frame.
Plus add in your own breast tissue.
So a size 6 girl with a B cup breast would get a lot more size from (let’s say) a 300cc implant, than a size 12 girl with an A cup.
Have you made rice sizers to try the different sizes that you are thinking of?.
The USA surgeons say that a C cup is approx 500cc of TOTAL volume.
Meaning if you already had 200cc of your own (A cup) and added 300cc to it – you should be a C cup. (150 x 2 = 2 cup sizes)
However implant profile/and overs/unders/existing breast tissue/ribcage all effect the end result.
Hope this helps.