Mole ↔ Gram Conversion

Convert between moles and grams using molar mass.

Inputs

Result

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General calculation reads

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How to use this calculator

  • Pick the direction.
  • Enter the amount and the molar mass (use molar-mass calculator if unknown).
  • Read the result.

About this calculator

A mole is 6.022 × 10²³ particles (Avogadro's number), and one mole of any substance has mass equal to its molar mass in grams. Converting between moles and grams is a multiplication or division by molar mass — the most common stoichiometry conversion.

Frequently asked

How do I find molar mass?+
Use the molar-mass calculator. Sum the atomic weights of all atoms in the formula.
Avogadro's number?+
6.02214076 × 10²³ — the number of particles in one mole. Defined exactly since 2019 SI redefinition.
Why moles vs grams?+
Reactions happen in mole ratios (stoichiometry). Lab measurements are in grams. Conversion is essential.
Why does the calculator default to 18.015?+
That's water's molar mass — a common quick-check value.
How precise should the molar mass be?+
3-4 decimals is plenty for most lab work. Pharmacy and metrology may need more.

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