Molarity Calculator (solution concentration M)
Enter the mass of solute, its molar mass and the solution volume to get molarity (mol/L) instantly.
Quick answer
5.85 g NaCl in 100 mL solution: 1.001 M.
How it is calculated
- Moles = mass ÷ molar mass = 5.85 ÷ 58.44 = 0.1 mol.
- Volume in litres = 100 mL ÷ 1,000 = 0.1 L.
- Molarity = moles ÷ litres = 0.1 ÷ 0.1 = 1 M.
Worked example
5.85 g of salt (NaCl, molar mass 58.44 g/mol) dissolved to make 100 mL of solution gives 1.001 M.
| Mass of solute | 5.85 g |
| Molar mass | 58.44 g/mol |
| Solution volume | 100 mL |
| Molarity | 1.001 M |
Formula
Molarity = Ms/Mw/(Vm/1000)
Good to know
- Use the volume of the whole solution, not just the water.
- Molar mass is the sum of atomic masses from the periodic table.
Questions people ask
What is the molarity formula?
M = moles ÷ volume of solution in litres.
How do I make 1 L of 1 M NaCl?
Dissolve 58.44 g of NaCl and make the total volume 1 L.
Molarity vs molality?
Molarity is per litre of solution; molality is per kg of solvent.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0