Science & engineering
Molality calculator
Calculate solute moles per kilogram of solvent, keeping solvent and solution mass separate.
A clear answer. Here’s how.
Molality m = solute moles ÷ kilograms of solvent, where solute moles = solute mass ÷ molar mass. Solvent mass excludes the solute. Also reports total mass and solute mass percentage. Unlike molarity, molality does not use final solution volume. No dissociation, reaction, solubility or material identity is inferred.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Solute mass (g)
- 10
- Solute molar mass (g/mol)
- 58.44
- Solvent mass (g)
- 1000
Example result
- Molality
- 0.171115674196 mol/kg solvent
- Solute amount
- 0.171115674196 mol
- Total solution mass
- 1,010 g
- Solute mass percentage
- 0.990099009901 %