The program is designed to recalculate the concentrations of substances in one- and multi- component aqueous solutions. The program also calculates the concentration of water and the solution density. For each chosen substance any of 6 concentration types can be entered: mass (g/l), molar (mol/l), mass fraction (%), mole fraction (dimensionless, from 0 to 1), g/kg of solvent, molal (mol/kg solvent). The number of substances in the solution is not limited. For chosen substancesn an info with brief description and maximum solubility can be displayed. For calculating of the density temperature is taken into account (entered in degrees Celsius or Kelvin). Density is calculated through the molar volumes of substances.