What is the Molarity Calculator?
Calculate the molarity of a solution from the mass of solute, molar mass and volume.
Enter mass of solute, molar mass and volume of solution and the Molarity Calculator returns molarity and moles of solute. Results update as you type, and nothing you enter leaves your device.
How it is calculated
M = (mass ÷ molar mass) ÷ volume in litres
How to use it
- Enter mass of solute in g.
- Enter molar mass in g/mol.
- Enter volume of solution in L.
- Read molarity in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Molarity Calculator use?
It uses: M = (mass ÷ molar mass) ÷ volume in litres.
What do I need to use the Molarity Calculator?
You need mass of solute, molar mass and volume of solution. Sensible starting values are filled in so you can see how it works straight away.
Is the Molarity Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.