Use the formula: Molarity = moles of solute / liters of solution
Find the mass of the solute in grams
Convert grams to moles using: moles = mass / molar mass
Measure the total volume of the solution in liters
Divide the number of moles by the volume in liters
If needed, convert milliliters to liters by dividing by 1000
If starting with concentration data, use the given values in the molarity formula
Check that the final unit is mol/L or M