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Molarity Calculator

Enter the mass of solute, its molar mass and the volume of the solution.

g
g/mol

Add up the atomic masses of the formula, for example NaCl is 58.44 g/mol.

The total volume of the finished solution.

Volume unit

This result is an estimate only. Double-check important figures before relying on them.

How it is calculated

  • Moles = mass ÷ molar mass
  • Molarity = moles ÷ volume in litres
  • Grams per litre = mass ÷ volume in litres

To dilute a solution, use the solution dilution calculator.

Worked example

58.44 g of sodium chloride (molar mass 58.44 g/mol) made up to 1 litre:

  • Moles = 1 mol
  • Molarity = 1 M

Why your number may differ

The result depends on the molar mass you enter, and on the solution volume rather than the water you started with. Follow your lab’s safety rules when preparing solutions.

Frequently asked questions

What is molarity?

The number of moles of solute dissolved in one litre of solution. It is written M or mol/L.

What is the formula?

Molarity = moles ÷ litres of solution, where moles = mass ÷ molar mass.

Is it the volume of the solvent?

No. It is the volume of the final solution, after the solute has been dissolved.

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