Molarity Calculator
Moles, mass and concentration for any solution.
Enter your values
ⓘ Live results
Results
- Molarity
- 1 mol/L
- Moles of solute
- 1 mol
- Millimolar
- 1000 mM
- Mass percent (aqueous, approx)
- 5.844%
Working
- 1moles = 58.44 ÷ 58.44 = 1
- 2M = 1 ÷ 1 = 1
Quick answer
Molarity is moles of solute per litre of solution: M = mass ÷ (molar mass × litres).
M = mass ÷ (MW × V)
How to use the Molarity Calculator
- 1Enter the mass of solute in grams.
- 2Add the molecular weight.
- 3Enter the final solution volume in litres.
Worked example
Using the values the calculator loads with:
Inputs
- Mass of solute58.44 g
- Molecular weight58.44 g/mol
- Solution volume1 L
Results
- Molarity1 mol/L
- Moles of solute1 mol
- Millimolar1000 mM
- Mass percent (aqueous, approx)5.844%
- moles = 58.44 ÷ 58.44 = 1
- M = 1 ÷ 1 = 1
Frequently asked questions
Molarity vs molality?
Molarity uses litres of solution and changes with temperature; molality uses kilograms of solvent and does not.
How do I dilute a stock solution?
Use M₁V₁ = M₂V₂ — multiply the stock concentration by the volume taken and divide by the final volume.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.