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Molarity Calculator — Mass, Molecular Weight, Volume & Concentration
Solve molarity in mol/L, solute mass in grams, final volume in litres or molecular weight in g/mol from the other three quantities.
Last updated: 2026-09-17
Results
Leave exactly one field blank to solve it
Formula, example and assumptions
M=n/V=(mass/MW)/V.
For 1 L of a 0.1 M solution of a 58.44 g/mol compound, the ideal solute mass is 5.844 g.
- Molarity is moles of solute per litre of final solution.
- Use the molecular weight for the exact chemical form, hydration state and salt you are preparing.
Frequently asked questions
How do I calculate grams from molarity?
Mass in grams equals molarity in mol/L multiplied by final volume in litres and molecular weight in g/mol.
Is molarity the same as molality?
No. Molarity uses litres of solution; molality uses kilograms of solvent.