Molecular Weight From a Formula
Molecular weight from a chemical formula, with brackets and hydrates, from the IUPAC 2024 abridged atomic weights.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Chemical formula as written, e.g. CaCl2.2H2O or Mg(OH)2
- CaCl2.2H2O
Result: Molecular weight 147.01 g/mol.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Chemical formula as written, e.g. CaCl2.2H2O or Mg(OH)2 (a charge only after a caret: SO4^2-)
How this is calculated
Citation
IUPAC Commission on Isotopic Abundances and Atomic Weights, Abridged Standard Atomic Weights 2024: the sum of each element's abridged standard atomic weight times its atom count, given to the precision the least precise element allows. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.