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Chemistry

Molecular Weight Calculator

Elemental composition and molar mass from a chemical formula.

MW = Σ (atom count × atomic weight)

Inputs

Results

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Assumptions & limitations

  • Supports case-sensitive element symbols, nested parentheses, square brackets, subscripts and dot hydrates (CuSO4·5H2O). No isotope labels, charges, fractional stoichiometry or leading coefficients.
  • Uses the versioned molecular-formula / isotope-abundances element database (NIST-derived data). Average atomic weights are approximate, not exact isotope masses or current certified reference values. Elements without a tabulated weight are rejected.