Molarity Calculator
Solution molarity from moles or mass of solute.
Enter your values
Enter the solute mass in g.
Enter the molar mass in g/mol.
Enter the solution volume in L.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Molarity
- 1 mol/L
- Moles of solute
- 1 mol
- Concentration
- 1 M
Quick answer
Molarity M = moles of solute / litres of solution.
M = n/V
At a glance
| What it does | Solution molarity from moles or mass of solute. |
|---|---|
| Category | Science |
| Inputs needed | Solute mass, Molar mass, Solution volume |
| Main output | Molarity |
| Formula | M = n/V |
| Cost | Free — no sign-up, no download |
How to use the Molarity Calculator
- 1Enter the mass of solute dissolved and its molar mass.
- 2Enter the total volume of the resulting solution in litres.
- 3Read the molarity in mol/L (M).
Inputs explained
- Solute mass(g)
- Enter the solute mass in g.
- Molar mass(g/mol)
- Enter the molar mass in g/mol.
- Solution volume(L)
- Enter the solution volume in L.
Worked example
Using the values the calculator loads with:
Inputs
- Solute mass58.44 g
- Molar mass58.44 g/mol
- Solution volume1 L
Results
- Molarity1 mol/L
- Moles of solute1 mol
- Concentration1 M
Frequently asked questions
What if I already know moles, not mass?
Divide moles directly by volume in litres to get molarity, skipping the mass-to-moles step.
Does temperature affect molarity?
Yes slightly, since solution volume can change with temperature; molality is often preferred when precision matters.
What do I need to enter into the Molarity Calculator?
Just 3 values: solute mass, molar mass, solution volume. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Molarity Calculator work out the answer?
Molarity M = moles of solute / litres of solution. It applies the formula M = n/V and shows the working so you can check each step by hand.
Is the Molarity Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.