Mass Percent Calculator. Mass percent tells you what fraction of a solution's total weight comes from a specific component — useful in chemistry, cooking, pharmaceuticals, and industrial mixing. Enter the Mass of Solute and Total Mass of Solution, then select your preferred units (g, mg, or kg) to get the Mass Percent. Secondary outputs include the Mass of Solvent and the Solute to Solvent Ratio. Also try the use the TDS Calculator (Total Dissolved Solids).
Mass percent is the ratio of the mass of a component to the total mass of a solution, expressed as a percentage. Percent composition typically refers to the mass percent of elements in a compound, while mass percent can apply to any component in any mixture or solution. See also our calculate Volume to Take from Stock (V1), Volume of Diluent to Add & Dilution Factor — Solution Dilution.
Use the formula: Mass percent = (mass of solute / total mass of solution) × 100. The total mass of solution includes both the solute and solvent masses.
First, find the total solution mass: 8 g + 42 g = 50 g. Then calculate: (8 g / 50 g) × 100 = 16% mass percent of NaCl. You might also find our Mixing Ratio Calculator useful.
Yes, but they must be converted to the same unit before calculation. Our calculator automatically handles conversions between grams, milligrams, and kilograms.
Mass percent (w/w) uses mass for both solute and solution, while volume percent (v/v) uses volumes. There's also mass/volume percent (w/v) which uses mass of solute and volume of solution.
Rearrange the formula: Mass of solvent = Total solution mass - Mass of solute. You can calculate the mass of solute from: Mass of solute = (Mass percent × Total solution mass) / 100. Check out our Concentration Calculator as well.