Most commercial/industrial solution concentrations are expressed either as...
%v/v volume/volume
%w/w weight/weight
%w/v weight/volume
to convert %w/w weight/weight to grams per ml (g/ml) use this formula.
(density of solution x %w/w)/100 = g/ml
Download my calcpack at
http://www.angelfire.com/scifi/WizardX/calculation/calcpack.zip