For beer, BeerSmith calculates everything as if 1 lb (or kg) is used to make 1 gallon (or l) of wort, must, juice, etc.. To my knowledge, it doesn't automatically account for the extra water in LME or whole juice. With LME or candi syrup, it's more about displacement than actual finished volume since the directions will say "add water to X volume." This may be different in Cider, Mead and Wine settings, I just don't have experience with those settings.