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Atoms to Moles Calculator

Convert between atoms, molecules, or particles and moles using Avogadro's number.

What this tool does

Convert between atoms, molecules, or particles and moles using Avogadro's number. Type an amount in particles (atoms, molecules or other elementary entities), choose the units, and the tool converts it to moles. It offers 8 amount of substance units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Particle (atom, molecule or other elementary entity), Mole, Kilomole, Millimole, Micromole, Nanomole, Picomole, Pound-mole. Starts as Particle (atom, molecule or other elementary entity).
  • To: Choose one of the same 8 units as "From". Starts as Mole.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from particles (atoms, molecules or other elementary entities) to moles:

  • 1 particle (atom, molecule or other elementary entity) ≈ 1.66054 × 10⁻²⁴ mol
  • 5 particles (atoms, molecules or other elementary entities) ≈ 8.3027 × 10⁻²⁴ mol
  • 10 particles (atoms, molecules or other elementary entities) ≈ 1.66054 × 10⁻²³ mol
  • 50 particles (atoms, molecules or other elementary entities) ≈ 8.3027 × 10⁻²³ mol
  • 100 particles (atoms, molecules or other elementary entities) ≈ 1.66054 × 10⁻²² mol

Multiply the number of particles (atoms, molecules or other elementary entities) by about 1.66054 × 10⁻²⁴ to get moles. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Particle (atom, molecule or other elementary entity): SI Brochure, 9th edition (2019). Mole: SI Brochure, 9th edition (2019).

Limitations

  • Converts a particle count and an amount in moles only. It does not use molar mass, so it does not convert to grams.
  • Very large and very small results are shown in scientific notation.

FAQs

Q: How many atoms are in one mole?
A: Exactly 6.02214076 × 10²³, the Avogadro constant fixed by the SI definition of the mole. The same number applies to molecules, ions or any other particle.
Q: How do I convert moles to atoms?
A: Choose mole in the From box and particle in the To box. The tool multiplies by the Avogadro constant.
Q: Does this work for molecules too?
A: Yes. The particle unit means any single entity: an atom, molecule, ion or electron. For atoms inside a molecule, multiply by the number of atoms per molecule yourself.

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