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Mole Calculator

Convert between mass, moles and particles using molar mass and Avogadro's number.

Convert mass, moles and particles

Mass: —
Amount: —
Particles: —
Molar mass used: —
One mole contains 6.02214076 times ten to the 23rd particles. Everything runs locally in your browser.

How to use the Mole Calculator

  1. Choose whether you know the mass in grams or the amount in moles.
  2. Enter the value and the molar mass of the substance.
  3. Read the mass, moles and particle count from the result panel.

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Frequently Asked Questions

Common questions about the free online mole calculator.

Divide the mass in grams by the molar mass. Water has a molar mass of 18.015 g/mol, so 18.015 g is exactly one mole.
Multiply the number of moles by Avogadro's number, 6.02214076 times ten to the 23rd. One mole always holds that many particles.
A mole is the amount of substance that contains 6.02214076 times ten to the 23rd elementary particles, which is Avogadro's number.
Add the atomic masses of every atom in the formula. The periodic table lookup on this site lists the atomic mass of each element.
Yes. Choose the moles option, enter the amount and the molar mass, and the tool shows the matching mass in grams.
Results are shown to six significant figures, which is more precise than most classroom data, so rounding is left to you.
No. Every calculation runs locally in your browser, so the numbers you type never leave your own device.
Yes. The calculator is fully responsive and works on phones, tablets and desktop browsers without any install.

Last updated: October 10, 2026