Molarity Calculator
Calculate molarity (M) from moles of solute and volume of solution in liters.
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Enter the number of moles of solute and the total volume of the solution in liters. The calculator divides moles by volume to give you the molarity in mol/L. If you know the mass of solute instead, first convert to moles by dividing by the molar mass.
About the Molarity Calculator
Molarity is the most common way to express solution concentration in chemistry. Defined as moles of solute per liter of solution (M = mol/L), it is used in virtually every chemistry lab for preparing solutions, performing dilutions, and solving stoichiometry problems. Note that molarity depends on total solution volume, not solvent volume alone.
Frequently Asked Questions
What is the difference between molarity and molality?
Molarity (M) is moles of solute per liter of solution. Molality (m) is moles of solute per kilogram of solvent. Molarity changes with temperature because volume changes, while molality does not because mass is temperature-independent.
How do I convert molarity to grams per liter?
Multiply molarity by the molar mass of the solute. For example, 0.5 M NaCl is 0.5 times 58.44 g/mol = 29.22 g/L.
What units does molarity use?
Molarity is expressed in moles per liter (mol/L), abbreviated as M. A 1 M solution contains exactly 1 mole of solute dissolved in enough solvent to make 1 liter of total solution.