Mass Percent Concentration Calculator
Percent by mass of a solution, converted to grams per litre, molarity and parts per million.
Results
Percent by mass
5.00000
%
Concentration
52.5000
g/L
Molarity
0.89836
mol/L
Parts per million
50,000
ppm
What this tool does
Concentration gets quoted four different ways depending on the trade, and converting between them needs the density, which changes as the solution gets stronger. The mass of solution is solute plus solvent together, not the solvent on its own — a common slip that makes every figure slightly too high.
Formula
% m/m = solute mass ÷ solution mass × 100
Variables
| Symbol | Meaning | Unit |
|---|---|---|
ms | Mass of solute | g |
mt | Total solution mass | g |
ro | Solution density | g/mL |
mm | Molar mass | g/mol |
PC | Percent by mass | % |
GL | Concentration | g/L |
MO | Molarity | mol/L |
PP | Parts per million | ppm |
Worked example
- Mass of solute25 g
- Total solution mass500 g
- Solution density1.05 g/mL
- Molar mass58.44 g/mol
- Percent by mass5.00000 %
- Concentration52.5000 g/L
- Molarity0.89836 mol/L
- Parts per million50,000 ppm
Limitations
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.
- Density changes with temperature, moisture and composition. Use a value from the supplier's data sheet whenever precision matters.