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Molecular Weight Calculator

Calculate the molecular weight (molar mass) of any chemical compound from its formula. Enter elements as symbols with numbers (e.g. H2O, C6H12O6, NaCl).

Enter Chemical Formula
Formula
Result
Molecular Weight
18.015
g/mol (H₂O)
ElementCountAtomic massTotal

Molecular Weight

Molecular weight (molar mass) = sum of atomic masses of all atoms. Unit: g/mol (Daltons). Used in stoichiometry, solution preparation, and chemical analysis.