Molecular Weight Calculator

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

Formula

Compound or element

or enter a formula

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

Amount conversion

Mass

Amount of substance

Molecular weight

— g/mol

Condensed formula

—

Element	Atoms	Atomic mass	Mass	% mass
—	—	—	—	—

Mass distribution

Formula

MW = Σ (atomic mass × atom count)