Molarity Calculator (M)
Calculate Mass, Molar Concentration, or Volume with Molecular Weight
How to Use the Molarity Calculator
Molarity (M) is the most common unit of concentration in pharmaceutical and chemistry laboratories. It is defined as the number of moles of solute per liter of solution (mol/L).
Step 1: Identify Molecular Weight
Find the Molecular Weight (MW) of your substance from the label, Certificate of Analysis (CoA), or periodic table.
Example: NaOH = 40.00 g/mol.
Step 2: Choose Calculation Type
Select what you need to find from the dropdown:
- Mass Required: To prepare a solution of known volume and molarity.
- Molarity: To determine the concentration of a prepared solution.
- Volume: To find how much solvent is needed to dissolve a specific mass at a target molarity.
Step 3: Calculate & Verify
Enter your values and click Calculate. The tool automatically provides the result and preparation instructions suitable for laboratory notebooks or batch records.
Key Formula
The fundamental equation used is:
Mass (g) = Molarity (M) × Volume (L) × Molecular Weight (MW)
Labels: Molarity Calculator (M)