Enter any two of molarity, moles, and volume to calculate the third.

How to Use the Molarity Calculator

Same two-of-three pattern as the Density calculator — molarity, moles, and volume — fill in any two and the third solves itself.

molarity (mol/L) = moles of solute ÷ liters of solution

This Molarity Calculator solves for molarity, moles, or volume — whichever two you know feed the third. Molarity is one way of expressing concentration, not the only one; molality and mass percent measure related but distinct things and aren't directly interchangeable with molarity without extra information like density.

One detail worth getting right: the denominator is total solution volume, not solvent volume. Dissolving something can shift the total volume slightly from what the solvent alone occupied, and molarity is defined against the final mixed volume specifically — using solvent volume instead introduces a small, avoidable error.