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Solution & Concentration Calculators

Mass Percent Calculator

Mass percent (w/w) of a solution from solute and solvent masses, in %, ppm and ppb.

Enter values

Results update as you type.

Result

Mass percent

12.5%

Total solution mass
200 g
Parts per million
125,000
Mass fraction
0.125

About the Mass Percent Calculator

Mass percent (w/w) of a solution from solute and solvent masses, in %, ppm and ppb.

Also known as: weight percent, w/w percentage, percent by mass solution, mass fraction.

How to use this calculator

  1. Enter solve for and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

% w/w = mass of solute ÷ total mass of solution × 100

Worked example

Using the values pre-filled in the calculator above:

  • Solve for: Mass percent
  • Mass of solute = 25 g
  • Mass of solvent = 175 g

the calculator returns:

  • Mass percent: 12.5%
  • Total solution mass: 200 g
  • Parts per million: 125,000
  • Mass fraction: 0.125