Moles & particles calculator

How it works

Enter a mass and molar mass, a number of moles, or a number of particles.

The formula

Moles = mass ÷ molar mass. Particles = moles × 6.022 × 10²³ (Avogadro's number).

Worked example

36 g of water ÷ 18.015 g/mol ≈ 2.00 mol, which is 2.00 × 6.022 × 10²³ ≈ 1.20 × 10²⁴ molecules.

Good to know

• Find the molar mass first with the molar mass calculator.