Molecular Weight Calculator

Easily compute the molecular weight of any compound by entering its chemical formula.

Options
Examples
H2O C6H12O6 NaCl Ca(OH)2 CuSO4·5H2O
Help

1. Enter a chemical formula (e.g., C2H6O)

2. The tool parses and calculates atomic contributions

3. Results are displayed with detailed breakdown

Tips:

  • Capitalization matters: use Fe, not fe
  • Use parentheses for groups (e.g., Ca(OH)2)
  • Supports hydrates (e.g., CuSO4·5H2O)
Enter a valid chemical formula (case sensitive)
About Molecular Weight

Molecular weight (or molar mass) is the sum of the atomic masses of all atoms in a molecule, measured in grams per mole (g/mol).

This calculator uses the standard atomic weights from the IUPAC periodic table. For elements with no stable isotopes, the atomic weight of the most common isotope is used.

The tool supports complex formulas including parentheses for grouped atoms (e.g., (NH4)2SO4) and hydrates (e.g., CuSO4·5H2O).