🔢 Mole Calculator (Grams ↔ Moles ↔ Particles)
Convert grams ↔ moles ↔ particles for any substance — type a formula to auto-fill the molar mass, and read all three at once.
Moles
1 mol
Mass
18.015 g
Particles
6.0221e+23
moles = mass ÷ molar mass; particles = moles × Avogadro (6.022×10²³). 🔒 Computed in your browser.
How the mole calculator (grams ↔ moles ↔ particles) works
Moles = mass ÷ molar mass; particles = moles × Avogadro’s number (6.02214076×10²³). Enter a chemical formula and the molar mass is computed from atomic weights; give any one of mass, moles or particles and the tool returns the other two.
The everyday conversion at the heart of stoichiometry. Type NaCl and it fills 58.44 g/mol; enter grams and read moles and the particle count instantly.
Frequently asked questions
How do I convert grams to moles?
Divide the mass in grams by the molar mass (g/mol). 18.015 g of water ÷ 18.015 g/mol = 1 mole. Enter a formula and the tool supplies the molar mass, then converts.
How do I convert moles to particles?
Multiply the number of moles by Avogadro’s number, 6.022×10²³. One mole of any substance contains that many molecules (or atoms/ions).
What is Avogadro’s number?
The number of particles in one mole: 6.02214076×10²³ (its exact defined value). It links the mole to a count of atoms or molecules.
Can it use a molar mass I already know?
Yes — you can type the molar mass directly instead of a formula, and the conversions use that value.
Is my calculation private?
Yes — everything runs in your browser.