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Molecular Weight Calculator

Fast and accurate online tool for calculating compound molecular weight, supporting molecular formulas and SMILES input, widely used in chemical research, education and industrial applications.

Enter a chemical formula or SMILES notation. Examples:
  • H2O (water)
  • NaCl (table salt)
  • CH3COOH (acetic acid)
  • C6H12O6 (glucose)
  • NH3 (ammonia)
  • O=O (oxygen, SMILES)
  • CC(=O)O (acetic acid, SMILES)

Frequently Asked Questions

Enter a chemical formula (e.g., H2O, NaCl) or SMILES string, then click the calculate button to get precise molecular weight and elemental composition analysis.

Supports standard chemical formulas, SMILES strings, and complex compound formulas including organic compounds, inorganic salts, etc.

We use the latest atomic mass data with multi-decimal precision calculations that meet research and educational requirements.

Yes, supports complex organic compounds including polycyclic compounds, heterocyclic compounds, etc. Also supports SMILES format input.