Concentration Molarity Calculator

Amount of substance dissolved. Leave blank to derive it from mass and molar mass, or from molarity and volume.
Mass of solute actually weighed out.
Needed to move between grams and moles. NaCl is 58.44 g/mol.
Volume of the finished solution, not the volume of solvent added.
The concentration you want. Use with a volume to work out how much solute to weigh.
Molarity
0.500000 mol/L
Molarity Calculator
Moles of solute
2.000000 mol
Solution volume
4.000000 L
Millimolar equivalent
500.0000 mmol/L
Worked out from OpenStax Chemistry 2e, section 3.3 Molarity and 2 other sources.
Enter the molar mass of the solute to also get the mass to weigh out.
Solution preparation figures assume the final volume is made up to the stated value. Confirm reagent purity, hydration state and the molar mass you entered before weighing anything out.

How this is worked out

1 step
  1. M = n / V = 2 mol / 4 L = 0.5 mol/L

Results are general information, not financial, tax, legal, medical or engineering advice.