Molarity Calculator

What This Calculator Does

This tool finds the molarity of a solution — the concentration of a dissolved substance (solute) expressed in moles per liter (mol/L, also written as M). It’s one of the most common calculations in chemistry labs and classrooms.

The Formula

Molarity is calculated in two steps. First, the mass of solute is converted to moles using its molar mass: moles = mass ÷ molar mass. Then molarity is found by dividing moles by the solution’s total volume in liters: Molarity (M) = moles of solute ÷ liters of solution.

A Few Notes

• Molar mass (g/mol) can be found on a compound’s label or calculated from its chemical formula.
• Volume refers to the total solution volume after the solute is fully dissolved, not just the volume of solvent added.
• This calculator is intended for general educational and laboratory-planning purposes and does not replace formal lab protocols or safety data sheets.