How do I calculate molarity?

Divide moles of solute by liters of solution: M = n / V.

How do I convert mL to L?

Divide milliliters by 1000. For example, 250 mL is 0.25 L.

Can this calculate moles?

Yes. Select Moles of solute and enter molarity and volume.

Is molarity affected by temperature?

Yes. Because molarity depends on solution volume, temperature changes can slightly affect precise molarity.

Molarity Calculator

Solve molarity, moles of solute, or solution volume with the core chemistry formula M = n / V.

Solve for

Molarity

mol/L

Moles of solute

mol

Solution volume

Molarity Formula

M = n / V

Molarity is the number of moles of solute per liter of solution. This calculator rearranges the formula to solve for molarity, moles, or volume.

Symbol	Variable	Description
M	Molarity	Molar concentration in mol/L.
n	Moles	Amount of solute in moles.
V	Volume	Total solution volume in liters.

How to Use the Molarity Calculator

1
Choose the unknown
Select whether you need molarity, moles, or solution volume.
2
Enter the known values
Use mol/L for molarity, mol for solute amount, and liters for volume.
3
Check units
Convert milliliters to liters and millimolar to molar before entering values.

Common Molarity Examples

Dissolving 0.5 mol of solute in 1 L of solution gives 0.5 M. Dissolving 0.1 mol in 250 mL gives 0.4 M because 250 mL is 0.25 L.

Molarity vs Molality

Molarity uses liters of solution, while molality uses kilograms of solvent. Most classroom concentration problems and many quick lab preparations use molarity.

Lab Preparation Tips

When preparing a molar solution, dissolve the solute first and then bring the final solution up to volume in a volumetric flask. Do not simply add solvent volume to dry solute volume.

Molarity Calculator FAQ

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