Mole converter
Convert between moles and particles. One mole is 6.022×10²³ of anything, which is why chemists count that way.
That's 8.2× as much as a teaspoon of sugar, while a glass of water is 139× more. That is about 6.022×10²² particles.
What it means
How many particles?
Avogadro’s constant has been fixed at exactly 6.02214076×10²³ per mole since the 2019 SI redefinition.
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Three things worth knowing
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A mole weighs its formula
Water is H₂O, so 2 + 16 = 18 g per mole. Weigh out 18 g of water and you have 6.022×10²³ molecules.
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Avogadro never counted it
Amedeo Avogadro proposed in 1811 that equal volumes of gas hold equal numbers of molecules. The constant was measured a century later and named after him.
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Moles of what?
A mole of oxygen gas (O₂) weighs 32 g; a mole of oxygen atoms weighs 16 g. The same word, and half the mass.
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About the mole
A mole is a counting word, like a dozen, but for 6.022×10²³ things. It is chosen so that a mole of a substance weighs its molecular mass in grams: water is 18 g, carbon 12 g.