Also known as molar mass, the formula weight of a substance is the sum of atomic weights of the atoms in a chemical formula. If the chemical formula represents a molecule, it is called the molecular weight. This is useful for molar mass calculation because one mole of a substance is equal to the formula weight in grams.
Enter the chemical formula of the substance below. Use a period for the dot in hydrates (like CoCl2.6H2O for cobalt(II) chloride hexahydrate). Parentheses are allowed (as in Al2(SO4)3 for aluminum sulfate). Note: This calculator does not check for the validity of the chemical formula.