Avogadro's Number Calculator

Avogadro's number (6.022 × 10²³) is the count of particles — atoms, molecules, ions — in one mole of a substance, and the Avogadro's Number Calculator uses it to convert between moles, particle counts, and mass. Select your calculation type (e.g., particles from moles, moles from particles, or mass conversions), choose your particle type, then enter your moles, number of particles, or mass and molar mass to get the converted result along with moles, particle count, and mass outputs.

mol
g
g/mol

Required when using mass calculations

For reference only

Results

Result

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Avogadro's constant

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Number of moles

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Number of particles

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Mass

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Frequently Asked Questions

What is Avogadro's number?

Avogadro's number is a fundamental physical constant representing the number of particles (atoms, molecules, ions, etc.) in one mole of any substance. Its exact value is 6.02214076 × 10²³ mol⁻¹.

What is Avogadro's number used for?

Avogadro's number is used to convert between the mass you can measure in the lab and the actual number of atoms or molecules involved in chemical reactions. It bridges the macroscopic and microscopic worlds in chemistry.

How do I calculate the number of particles from moles?

Multiply the number of moles by Avogadro's number (6.022 × 10²³). The formula is: Number of particles = moles × 6.022 × 10²³.

How do I calculate moles from mass?

Divide the mass in grams by the molar mass in g/mol. The formula is: moles = mass (g) ÷ molar mass (g/mol). You need to know the molar mass of the substance.

Who was Avogadro?

Amedeo Avogadro (1776-1856) was an Italian physicist who proposed that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules, known as Avogadro's law.

What does one mole represent?

One mole represents exactly 6.02214076 × 10²³ elementary entities of any substance. For example, one mole of water contains that many water molecules, and one mole of carbon contains that many carbon atoms.

How do I calculate mass from number of particles?

First convert particles to moles by dividing by Avogadro's number, then multiply by the molar mass. Formula: mass = (particles ÷ 6.022 × 10²³) × molar mass (g/mol).