basic

Molality Calculator

Moles of solute per kilogram of solvent.

Compute molality (mol of solute per kg of solvent) from the mass of solute, its molar mass, and the mass of pure solvent.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

g
g/mol
kg

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

m = (mass_solute / molar_mass) / (mass_solvent_kg)

In depth

Compute molality (mol of solute per kg of solvent) from the mass of solute, its molar mass, and the mass of pure solvent.