Moles to Particles Calculator
The number of particles in a given amount of substance (Avogadro number).
Result
Particles (× 10²³)
6.0221
How it works
Avogadro's number, 6.022 × 10²³, is how many particles sit in one mole of any substance. Multiply your quantity in moles by it and you get the raw count of atoms, molecules or ions: 2 moles contains about 1.204 × 10²⁴ particles. The magnitude is genuinely hard to picture. A single mole of grains of sand would bury entire countries kilometres deep; a mole of seconds is trillions of times the age of the universe. Yet a mole of water is just 18 grams — a mouthful — because atoms are unimaginably small. That is precisely why the mole exists: it is the bridge between the invisible scale of particles and the grams a balance can weigh. Since 2019 the number is fixed by definition rather than measured — the mole is now defined as exactly 6.02214076 × 10²³ particles.
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Frequently asked questions
What is Avogadro’s number?
6.022 × 10²³ — the count of atoms or molecules in exactly one mole.
Why show it in 10²³?
The raw count is enormous; dividing by 10²³ keeps the number easy to read.
Why is Avogadro's number that particular value?
Historically it was chosen so one mole of carbon-12 weighed exactly 12 grams, linking atomic mass to grams. Since the 2019 SI redefinition, it is fixed by definition at exactly 6.02214076 × 10²³.
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