Molarity (M) is the number of moles of solute per liter of solution. M = n/V, where n is moles and V is volume in liters.

How do you calculate moles from mass?

Moles = mass (g) / molar mass (g/mol). For example, 18 g of water (molar mass 18.015 g/mol) = 1 mole.

Back to home

Molarity Calculator

Calculate solution molarity (M = n/V), moles of solute, or volume. Results shown in mol/L, mmol/L, and μmol/L.

Calculate

Solve For

Moles input method:

Moles of solute (mol)

Volume of solution (L)

About the Molarity Calculator

Molarity (M) measures the concentration of a solution as moles of solute per liter of solution: M = n/V. This is one of the most commonly used concentration units in chemistry labs. You can enter moles directly or provide mass and molar mass to have the moles calculated automatically. To find the molar mass of a compound from its chemical formula, try our Molecular Weight Calculator.

In laboratory settings, molarity is used to prepare buffer solutions, dilute stock solutions, and calculate reaction stoichiometry. The calculator also outputs millimolar (mM) and micromolar (μM) concentrations for convenient reference. For physical properties of solutions, you may also find our Density Calculator useful for converting between mass concentration and volumetric concentration.

Related Calculators

Explore more free online calculators to help with your calculations

Molecular Weight Calculator

Calculate molar mass from formula

Density Calculator

Calculate density, mass, or volume

Percentage Calculator

Calculate percentage values

Take this calculation further

Browse the other calculators collection for more tools in this subject.

For a related calculation, use Molecular Weight Calculator to calculate molecular weight from a chemical formula. Shows elemental composition and mass percentages. Alternatively, use Speed Calculator to solve for speed, distance, or time with S = D/T. Supports mph, km/h, m/s, knots, and more.