Solve for molarity, moles or volume using the relationship molarity = moles ÷ litres.
What this calculator does
Molarity is the concentration of a solution in moles per litre. Choose what to solve for, enter the other two values, and this calculator returns the answer.
It’s a core tool for chemistry lab work.
How to use it
- Choose whether to solve for molarity, moles or volume.
- Enter the two known values.
- Read the result.
The calculation
molarity = moles ÷ litres
moles = molarity × litres · litres = moles ÷ molarity
Try it with these numbers
Worked through, a moles of 0.5, volume of 2, molarity of 1 produces a result of 0.25. Alongside it, Formula comes out at moles ÷ litres. Change any field and every figure updates as you type.
Common questions
What is molarity?
The number of moles of solute per litre of solution, written mol/L or M.
How do I make a solution of a given molarity?
Multiply the molarity by the volume in litres to get the moles needed, then weigh out that many moles of solute.
What’s the difference from molality?
Molarity uses litres of solution; molality uses kilograms of solvent. This tool covers molarity.