Molarity Calculator
Solution Concentration Calculator
Molarity
Ready for Calculation
Enter the solute mass, molar mass, and solution volume to calculate molarity.
Understanding Molarity
Molarity (M) expresses the concentration of a solution as moles of solute per liter of solution. It's the standard unit chemists use to prepare accurate, reproducible solutions in the lab, from titration standards to buffer solutions.
Moles First
Molarity is always derived in two steps: first convert mass to moles (moles = mass ÷ molar mass), then divide moles by the solution's volume in liters.
Volume of Solution, Not Solvent
A crucial detail: molarity uses the total volume of the final solution (solute + solvent combined), not just the volume of water or solvent added.
Finding Molar Mass
Molar mass is the sum of the atomic masses of every atom in a compound's formula. Our Molecular Weight Calculator computes this automatically from a chemical formula like NaCl or C6H12O6.
Common Reagent Example
Table salt (NaCl) has a molar mass of about 58.44 g/mol — dissolving 58.44 g in enough water to make 1 L of solution gives a 1 M solution.
Key Takeaways
- Units Matter: Always keep mass in grams, molar mass in g/mol, and volume in liters for the standard molarity formula.
- Dilution Follows Separately: To dilute an existing solution to a target molarity, use the dilution equation M₁V₁ = M₂V₂ instead of this calculator.
- Lab Safety: Always follow proper lab safety protocols and material safety data sheets (MSDS) when preparing chemical solutions.