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Mihsaba›Chemistry›Molarity Calculator

Molarity Calculator

Calculate solution molarity from amount in moles and solution volume in liters, with mmol/L conversion.

Use final solution volume, not solvent volume alone.

How to use

Molarity is the number of moles of solute per liter of final solution volume, one of the most common concentration units in chemistry.

  1. Enter solute moles.
  2. Enter final solution volume in liters.
  3. Calculate M.
  4. Review mol/L and mmol/L.

How it is calculated

M=n/V

Example

0.5 mol in a final volume of 1 L gives 0.5 M = 500 mmol/L.

Important notes

If starting from mass, convert grams to moles first using the correct molar mass.

Frequently asked questions

Is V the solvent volume?

No, final solution volume.

M units?

mol/L.

Can moles be zero?

Yes, giving zero concentration for positive volume.