Percentage Concentration to Molarity Calculator

Percentage Concentration to Molarity Calculator

The Percentage Concentration to Molarity Calculator converts between weight/volume percentage and molarity for aqueous solutions. Percentage concentration gives the mass of solute per 100 units of solution mass, while molarity counts moles of solute per liter.

$$M = \frac{\mathrm{wt\%} \times \rho}{MM \times 100}$$

where $M$ is molarity in mol/L, wt% is percentage concentration, $\rho$ is solution density in g/L, and $MM$ is molar mass in g/mol.

To convert molarity back to percentage:

$$\mathrm{wt\%} = \frac{M \times MM \times 100}{\rho}$$

For a 10% NaCl solution with density 1080 g/L and molar mass 58.44 g/mol, molarity is about 1.848 M.

Related tools: Molarity Calculator, Mass Percent Calculator, and Concentration Calculator.