Molarity Calculator

Find the concentration of a solution in moles per liter, or how much solute to weigh out.

What Do You Want to Find?
NaCl is 58.44 g/mol.
Enter values in the units shown.
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Result
Moles of solute
Millimolar
Grams per liter
Work

Saved Calculations

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How to Calculate Molarity

Moles = mass (g) ÷ molar mass (g/mol)   Molarity (M) = moles ÷ liters of solution
Mass needed = M × liters × molar mass

Worked Example

Tips

The volume is the final solution volume, not the volume of water added: dissolve the solute in less water, then fill to the mark in a volumetric flask.