Chemistry / CALCULATOR

Mass Percent to Molarity

Mass Percent to Molarity with defined units, a worked example and input validation.

Runs on your deviceUpdates as you typeFormula & example ↓
01

Your inputs

Adjust the values to explore a different result.

%
Enter solute mass fraction in %.
g/mL
Enter solution density in g/mL.
g/mol
Enter molar mass in g/mol.

Formula

molarity=mass%/100 ×density ×1000/molar mass.
  • Use the units shown beside each field.
  • Results update automatically whenever you change an input.
  • Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
  • Mass/mass percent, not mass/volume percent. Density must be for the actual solution composition and temperature.

Example Calculation

Example inputs
  • Solute mass fraction: 10 %
  • Solution density: 1.2 g/mL
  • Molar mass: 60 g/mol

Solute mass fraction = 10; Solution density = 1.2; Molar mass = 60. Primary result: 2.

Frequently asked questions

How do I use this calculator?

Enter solute mass fraction, solution density, molar mass. The result updates automatically. Use Reset to restore the example values.

What method does it use?

molarity=mass%/100 ×density ×1000/molar mass.. Mass/mass percent, not mass/volume percent. Density must be for the actual solution composition and temperature.

Why might a rounded result differ?

The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.

Are my inputs saved online?

No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.

Check the assumptions and units before using this result. Read about calculation methods.