Science & Engineering

Mole Calculator (mass, moles, particles)

Convert between mass, moles, and particle count in any direction. Pick from 14 preset substances or enter your own molar mass, and it uses the Avogadro constant from the 2019 SI redefinition.

How to use
  1. Choose a preset substance or enter a molar mass.
  2. Fill in the value you know: mass, moles, or particles.
Amount
Moles
0.999168 mol

n = m / M = 18 g / 18.015 g/mol

Mass
18 g
Moles
0.999168 mol
Particles
6.017e23
Molar mass
18.015 g/mol
For study and estimation. Verify against authoritative data before relying on a result.
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How it's calculated

n = m ÷ M, N = n × Nₐ

n = moles, m = mass (g), M = molar mass (g/mol), N = number of particles, Nₐ = Avogadro's number 6.022×10²³. Rearrange to m = n × M or n = N ÷ Nₐ.

Common questions

How many particles are in a mole?

One mole contains 6.02214076 x 10^23 particles, the Avogadro constant fixed by the 2019 SI redefinition.

How do I convert grams to moles?

Divide the mass in grams by the substance's molar mass in grams per mole.

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