Formula and method
Moles = mass in grams/molar mass in g/mol. Molarity = moles/final solution liters.
Worked example
A 5.844 g solute with molar mass 58.44 g/mol contains 0.1 mol. In a final 1 L solution, concentration is 0.1 mol/L or 100 mmol/L.
Molarity Calculator
Calculate mol/L and mmol/L from solute mass, molar mass and final solution volume.
Printed from Calxy · https://www.calxy.net/other/molarity-calculator
Molar concentration0.1000 mol/L
g
0 – 1000000000000000
g/mol
1e-12 – 1000000000000000
L
1e-12 – 1000000000000000
Molar concentration
0.1000 mol/L
- Amount of solute0.1000 mol
- Millimolar concentration100.0000 mmol/L
Use final solution volume, not the volume of solvent added. Purity, dissociation, activity and temperature-dependent volume changes are not modelled.
How this was calculated
Moles = solute mass in grams ÷ molar mass in g/mol.
Molarity = moles ÷ final solution volume in liters.
Frequently asked questions
Should I enter solvent volume?
Enter final solution volume. Dissolving a solute can change volume, so the amount of solvent added is not necessarily the final volume.
Last updated . Results are estimates for informational purposes only.