Grams to Moles Calculator

Grams to Moles Calculator

The Grams to Moles Calculator converts between mass and amount of substance using molar mass. In stoichiometry, you often know the mass of a sample in grams but need the number of moles for reaction calculations.

$$n = \frac{m}{M}$$

where $n$ is the number of moles (mol), $m$ is the mass in grams (g), and $M$ is the molar mass in g/mol.

Example: $142.04$ g of sodium sulfate (Na₂SO₄, $M = 142.04$ g/mol) contains $n = 142.04 / 142.04 = 1.00$ mol.

One mole contains $6.022 \times 10^{23}$ particles (Avogadro's number). Converting grams to moles is faster than counting individual atoms or molecules.

Related tools: Molar Mass Calculator, Concentration Calculator, and Percent Yield Calculator.