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Molality to Molarity Conversion Calculator

Convert mol/kg-of-solvent into mol/L using density and MW.

Convert solute molality (mol per kg of solvent) into molarity (mol per L of solution) given the solution density and the solute molar mass: M = m·ρ / (1 + m·MW/1000).

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

Inputs

mol/kg
g/mL
g/mol

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 = m · ρ / (1 + m · MW / 1000); ρ in g/mL, MW in g/mol.

In depth

Convert solute molality (mol per kg of solvent) into molarity (mol per L of solution) given the solution density and the solute molar mass: M = m·ρ / (1 + m·MW/1000).