Skip to content

Science · free · no sign-up

Avogadro calculator

Convert between moles, number of particles and mass using Avogadro's number, the number of particles in one mole of a substance.

How it works Report a problem

Avogadro calculatorAvogadro

Molecular & Molar Quantity Intelligence

Avogadro's Constant: NA = 6.02214076 × 10²³ mol⁻¹

Avogadro's number links the invisible world of atoms to the measurable world of grams and moles: one mole of anything contains about 6.022 × 10²³ particles. This calculator converts between moles and particle counts in either direction.

How to use this calculator

  • Choose the direction: moles to particles, or particles to moles.
  • Enter the amount you have.
  • Press calculate to see the converted value.

Why the number is so large

Atoms are so small that laboratory quantities contain astronomical counts of them. Avogadro's number is the bridge sized so that one mole of an element weighs its atomic mass in grams, which is what makes mole calculations practical at the bench.

Frequently asked questions

What is Avogadro's number?
Approximately 6.022 × 10²³ particles per mole. It applies to atoms, molecules, ions or any countable unit.
How do I convert moles to atoms?
Multiply the moles by 6.022 × 10²³. For compounds, multiply again by the number of that atom in each formula unit if the question asks for a specific element.
How do I go from particles back to moles?
Divide the particle count by 6.022 × 10²³. The result is often a small decimal, which is normal for tiny samples.