Science
Molarity calculator
Molar concentration (mol/L) from mass, molar mass and volume.
- Instant
- Free
- Private (processed locally)
- No sign-up
Calculate a molarity
Enter the mass, the molar mass and the volume: the tool gives the molar concentration and the amount of substance.
Example (NaCl)
| Input | Value |
|---|---|
| Mass | 58.44 g |
| Molar mass | 58.44 g/mol |
| Volume | 1 L |
| Molarity | 1 mol/L |
Exact calculation. 100% local.
Frequently asked questions
Which formula?
C = n / V, where n (mol) = mass (g) ÷ molar mass (g/mol) and V is the volume in liters.
Where to find the molar mass?
Use our “Molar mass” tool: it computes the molar mass from the chemical formula.
What about dilution?
For a dilution use C₁V₁ = C₂V₂; this tool gives the starting concentration.