A molarity calculator finds a solution's molar concentration, amount of solute, or total volume using M = n/V. Choose the unknown, enter the other two values, and see unit conversions with clear steps.
Chemistry learning support
Use the worked conversion as a model, then build differentiated chemistry practice with SPED Lesson Planner.
Solution concentration
The field being calculated is disabled. Choose its result unit, then enter the other two positive values.
Your values stay in this browser and are not uploaded.
Molarity result
Calculated after converting the known values to moles, liters, and mol/L.
Molarity
0.25 mol/L
Amount
0.5 mol
Volume
2 L
Molarity equals moles of solute divided by liters of final solution: M = n/V. Rearrange it to n = M × V for amount or V = n/M for solution volume.
1 M = 1,000 mM = 1,000,000 μM.
1 mol = 1,000 mmol = 1,000,000 μmol.
1 L = 1,000 mL = 1,000,000 μL.
A molarity calculator uses M = n/V to find a solution's molar concentration, amount of solute, or volume from the other two values.
Molarity is measured in moles per liter, written mol/L or M. Millimolar and micromolar are 10^-3 M and 10^-6 M.
Convert milliliters to liters by dividing by 1,000, then divide moles of solute by liters of solution.
Molarity uses the final total volume of the solution, not only the volume of the solvent before mixing.
For a physical solution calculation, the known amount, concentration, and volume must be greater than zero.