Grams to Moles Calculator
Convert between grams and moles using n = mass / molar_mass.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
Can't find what you need?
Request a ToolHow to Use the Grams to Moles Calculator
Enter the mass of your substance in grams and its molar mass in g/mol. The calculator divides mass by molar mass to give the number of moles. To go from moles to grams, multiply moles by molar mass.
About the Grams to Moles Calculator
Converting between mass and moles is one of the most fundamental operations in chemistry. The relationship n = m/M connects the macroscopic world (grams you can weigh) to the microscopic world (moles representing a count of atoms or molecules). This conversion is the gateway to all stoichiometric calculations.
Frequently Asked Questions
How do I convert grams to moles?
Divide the mass in grams by the molar mass in g/mol. For example, 36 g of water (molar mass 18.015 g/mol) equals 36/18.015 = 2.0 moles.
How do I convert moles to grams?
Multiply the number of moles by the molar mass. For example, 3 moles of NaCl (molar mass 58.44 g/mol) equals 3 x 58.44 = 175.32 g.
Where do I find the molar mass?
Look up atomic masses on the periodic table and sum them for the formula. Or use our Molar Mass Calculator, which parses chemical formulas automatically.