Molarity Calculator

Calculate molarity from solute amount, molar mass, and solution volume.

Calculator Inputs

Select a common compound or enter your own.
Mass of the solute used in the solution.
g/mol
Molecular/molar mass of the compound.
Final total volume of the solution.

Results

Calculated Molarity
—
mol/L (M)
Millimolar — mM
Micromolar — µM
Moles of solute — mol
Volume in liters — L
Formula
M = n / V
M = molarity, n = moles of solute, V = volume in liters

Calculation Steps

Enter your values and click Calculate.
Your calculated molarity will appear here.

What is Molarity?

Molarity is the amount of solute, measured in moles, present in one liter of solution. It is commonly expressed as mol/L or M.

Molarity Equation
M = n / V
where M is molarity, n is moles of solute, and V is solution volume in liters.

How to Calculate Molarity

  1. Enter the amount of solute.
  2. Enter the molar mass in g/mol.
  3. Enter the final solution volume.
  4. Click Calculate Molarity.
  5. The calculator converts the units and displays the result.

Example Calculation

Example: Calculate the molarity of a solution containing 5.844 g of NaCl in 500 mL of solution.

NaCl molar mass = 58.44 g/mol
Volume = 500 mL = 0.5 L
Moles = 5.844 ÷ 58.44 = 0.100 mol
Molarity = 0.100 ÷ 0.5

Result = 0.200 M

Unit Conversions