Molar Mass Calculator or Molecular Weight Calculator is used to calculate the Molar Mass or Molecular Weight of the given chemical formula. The term Molar Mass is used all the time in chemical calculations, so we need to know what it means. First it is a mass so it has units of mass commonly the gram. Second it concerns the mole (Avagadro's number), Whether we are dealing with elements or compounds, the Molar Mass of a species is the mass in grams of one mole (6.022 x 10²³) of that species: one mole of atoms, one mole of molecules or one mole of formula units.

Two important facts to remember
1. One mole of an element is 6.022 x 10²³ atoms of that element.
2. One mole of an element is an amount of that element equal to its molar mass (an amount equal to its atomic mass in grams).We know that 1 mole of any element = 1 molar mass of that element = 6.022 x 10²³ atoms of that element. So molar mass of any element = the atomic mass of that element in grams.Below is given a default chemical formula you can just see how the molar mass is calculate using the calculator.