What is bulk density? In simple terms, it’s mass per unit volume of powder, liquid, granules--any material-- in a bulk state. When handling solids or powders, a bulk material’s weight is usually stated as lb./ft3 or g/cm3. Veteran processors often have their material weights memorized. While the graphics and easy-to-understand reports on BinCloud seem simple, bulk inventory information results from numerous calculations like vessel size, headspace, and the material's density.