What is the molarity formula?

Molarity (M) equals moles of solute divided by litres of solution. Since moles equal mass in grams divided by molar mass, M = mass ÷ (molar mass × volume in litres).

How do I convert millilitres to litres?

Divide millilitres by 1000. This tool does the conversion for you when you pick mL in the unit selector.

Is my data sent anywhere?

No. Every calculation runs locally in your browser and nothing is uploaded.

Molarity Calculator

Find molarity, mass or volume from the M = n/V relationship.

Molarity calculator

Molarity (symbol M, units mol/L) is the number of moles of solute dissolved per litre of solution. The core relationship is:

M = moles ÷ litres = mass ÷ (molar mass × volume in litres)

Choose whether you want the molarity, the mass of solute to weigh out, or the volume of solution to prepare, enter the values you know, and the answer appears instantly — all in your browser.