Molarity Calculator

What is the Molarity Calculator?

Calculate the molarity of a solution from mass, molar mass and volume. Molarity tells you how many moles of solute are dissolved in each liter of solution.

How to use the Molarity Calculator

1. Enter your mass of solute, your molar mass, your solution volume.
2. Results update automatically as you type; you can also press Calculate.
3. Read the output: molarity, moles of solute.
4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Worked example

With mass of solute = 5.85 g, molar mass = 58.44 g/mol, solution volume = 0.5 L, the Molarity Calculator returns molarity: 0.2002 mol/L; moles of solute: 0.10010 mol.

Where the Molarity Calculator helps in real life

You dissolve 5.85 g of sodium chloride in 1 liter of water. The calculator shows a 0.1 M solution.

A lab requires a specific molarity. Entering mass and molar mass checks your preparation.

Common mistakes to avoid

• Using milliliters instead of liters.
• Using the wrong molar mass.
• Confusing molarity with molality.
• Measuring final volume incorrectly.

💡 Practical tip: Molarity uses the volume of the final solution, not just the solvent added.

Tips for better results

• Convert mL to L.
• Check molar mass from reliable sources.
• Make up solutions to the final volume.

Related tools