Molecular Weight Calculator

Calculate molar mass for any formula, including hydrates and nested brackets, with percent composition broken down by element.

Formula

Nesting and hydrates welcome: KAl(SO4)2·12H2O, [Cu(NH3)4]SO4.

Amount conversion
Molecular weight
—g/mol
Condensed formula
—
ElementAtomsAtomic massMass% mass
—————
Mass distribution — share of total weight per element
MW = Σ (atomic mass × atom count)