Molar Mass Calculator

Molar mass is the mass of one mole of a substance (6.022 x 10^23 particles). This calculator parses chemical formulas, looks up atomic masses from the periodic table, and sums the contributions from each element to give you the total molar mass in g/mol.

1. 1

   Enter Chemical Formula

   Type the molecular formula using standard notation (e.g., H2O, NaCl, C6H12O6)

2. 2

   Parse Elements

   The calculator identifies each element and counts how many atoms are present

3. 3

   Look Up Atomic Masses

   Atomic masses are retrieved from the periodic table for each element

4. 4

   Calculate Total

   Each element's contribution (atomic mass x count) is summed for the total molar mass

• 1

  One mole contains exactly 6.022 x 10^23 particles (Avogadro's number)

• 2

  Water (H2O) has a molar mass of 18.015 g/mol

• 3

  Use parentheses for complex formulas like Ca(OH)2 or Al2(SO4)3

• 4

  Molar mass in g/mol numerically equals molecular weight in amu

• 5

  Always use capital letters for element symbols (Na not na)

• Forgetting to multiply by subscripts (H2O has 2 hydrogens, not 1)

• Not handling parentheses correctly in complex formulas

• Confusing molar mass (g/mol) with molecular mass (amu)

• Using lowercase for element symbols which may cause parsing errors