Molar Mass (Molecular Weight) Calculator

Please enter a chemical molecular formula (input is case sensitive) and click on "Calculate" to determine the molecular mass of the compound. (Instructions)


This program determines the molecular mass of a substance. Enter the molecular formula of the substance. It will calculate the total mass along with the elemental composition and mass of each element in the compound.

  • Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
  • You can use parenthesis () or brackets [].

Finding Molar Mass

Read our article on how to calculate molar mass.