I have just measured (not precisely or accurately!) the volume of my 38F breasts:
Left = 600 ml
Right = 500 ml
Total breast volume = 1100 ml
Assuming breast is 100% fat (I know it's not but it will do).
Mass = 1100 ml x 0.9g/ml = 990 g = 2.2 lbs
Volume wise 38F = 36FF = 34G
My volume seems to completely agree with my size but not the mass according to the table right at the end of this:
Brassiere measurement - Wikipedia, the free encyclopedia
According to that my breasts have a mass of 4.4 lbs (so a higher density than I thought). I would be VERY surprised if I don't lose volume as I lose weight.
I expect my back size to go down to a 34 at goal but I do not expect to be a 34G (no loss of volume). I was a 34DD last time I was slim (BMI 22.5) - which is a significant loss of volume.
Anyway, table at bottom of above article seems reasonably accurate for me at least - so you could work out the difference between your breasts at goal and the average. The only thing is it looks American and I think they call a DD an E as they don't do double sizes? Not sure - needs investigating!
Anyway, average bra size is supposed to be 34DD (average size people actually wear is a 36C) - and that is what I was when I was slim.
I guess a rough estimate would be to use the table to calculate the difference in mass between your breasts and a 34DD (34 E on there?) when you are at goal then? I think unless you have extremely large breasts at goal it will only be a matter of a couple of pounds really though.
Might come back to this when I have thought about it more!
ADD: seems women have varying amounts of dense/vs fatty breast tissue. Some have 10% dense and others 60% etc - which can make a big difference in mass for the same volume. So....I give up!
