This depends on how much breast tissue there is to begin with. For a DD cup size, it may be enough to reduce you to a C cup breast. Typical breast reductions remove tissue from 500 gm to 2000 gm or more per breast so this is whithin a normal range.
I assume you are asking how grams relates to pounds. To do the convervions, multiple the grams by 0.0022 to find the weight in pounds. 650 x 0.0022 = 1.433 pounds.That does not sound like alot but it is when you are carrying it around your neck all day.If you want to know how that relates to your breasts, we would need to know your breast size. height, weight and probably do an exam. It is very tough to give an exact size that would result from removal of a specific weight of breast tissue. It is difficult to go into surgery with the thought that "I have to remove 650 grams" rather than "I need to reduce the breast size to relieve symptoms and have an attractive breast with sensation when finished".Unfortunately, insurance companies seem to be getting hung up on a specific amount of weight that needs to be removed in order for them to consider the procedure "medically necessary". That is why we jump through the hoops of trying to determine the weight.I hope I answered your question