Molarity and dilution calculator
Leave one box empty and it solves for that value, with the work shown.
Need the molar mass? Use the molar mass calculator.
M1V1 = M2V2. Concentrations can be in any unit as long as M1 and M2 match.
How these formulas work
Molarity is moles of solute per liter of solution: M = n ÷ V. Convert milliliters to liters before using it, which the calculator does for you.
When you dilute a solution, the moles of solute stay the same, so M1V1 = M2V2. If you know three of the four values, the fourth follows. The solvent to add is V2 minus V1.