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Molarity Calculator

Find the molar concentration of a solution from mass, moles, volume or a target molarity.

Molarity of a solution

Molarity: —
Moles of solute: —
Mass of solute: —
Molarity is the moles of solute per litre of solution. Everything is calculated locally in your browser.

How to use the Molarity Calculator

  1. Pick whether you know the solute mass, the moles or a target molarity.
  2. Enter the solute data, the molar mass and the solution volume in litres.
  3. Read the molarity, the moles and the mass of solute from the result panel.

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Frequently Asked Questions

Common questions about the free online molarity calculator.

Molarity is the number of moles of solute dissolved in one litre of solution. It is written as mol/L and is also called molar concentration.
Divide the moles of solute by the volume of the solution in litres. For 0.1 mol in 1 litre the molarity is 0.1 mol/L.
Divide the mass in grams by the molar mass to get moles, then divide by the volume in litres. This tool does both steps at once.
Sodium chloride has a molar mass of 58.44 g/mol, so 5.85 g is 0.1001 mol and the solution is about 0.1 mol/L.
Yes. Choose the target molarity option, enter the molarity and the volume, and the tool reports the mass of solute to weigh out.
The calculator expects litres. Divide millilitres by 1000 first, so 250 mL becomes 0.25 L before you enter the volume.
No. The calculation happens entirely in your browser and nothing you type is stored or transmitted anywhere.
Yes. Molarity is based on volume, which expands with heat, so a solution made at one temperature can change slightly when warmed.

Last updated: October 10, 2026