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Mole concept · Chemistry

Moles, Mass & Particles Calculator

Convert among sample mass, amount in moles, and number of particles using molar mass and Avogadro’s constant.

Formula shown Runs locally Reviewed Aug 11, 2026
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Equation guide

Amount of substance, sample mass, and specified entities

Amount from mass

n = m/M

Number of particles

N = nNₐ
Mole concept calculator

Convert chemical amount

Mass is expressed in grams and molar mass in g/mol. Particle conversion uses the exact Avogadro constant, 6.02214076 × 10²³ mol⁻¹.

m ⇄ n ⇄ N

Mass, moles, and particles will appear here.

Using the model

Symbols, assumptions and limitations

Interpretation notes

Nₐ = 6.02214076 × 10²³ mol⁻¹ exactly. Enter the molar mass of the substance in g/mol.

Worked examples

See the method in practice

01

One mole of water

18.015 g of H₂O is about 1 mol and contains 6.02214076 × 10²³ molecules.

02

Particles to mass

Convert particles to moles with N/Nₐ, then multiply by molar mass.

Questions

Frequently asked

What counts as a particle?

It may mean atoms, molecules, ions, or formula units; state the entity appropriate to the substance.

Where do I get molar mass?

Use the Molar Mass calculator, then enter its result here in g/mol.

Sources & review

Equations and examples are checked against the references below. Results are educational and should be independently verified for safety-critical work.

OpenStax Chemistry — formula mass and the mole concept

Written by the STEM Hub editorial team · Reviewed August 11, 2026 · Review methodology