How It Works
Sums atom counts using the NIH PubChem periodic table, retrieved October 2026. Example: CuSO4·5H2O. Uses average atomic masses; radioactive elements may use representative mass numbers.
Supports all 118 elements. Does not parse charges, isotope labels, chemical equations or ambiguous plain-dot hydrate syntax.
Reference Sources
FAQs
How does this calculator work?
Sums atom counts using the NIH PubChem periodic table, retrieved October 2026. Example: CuSO4·5H2O. Uses average atomic masses; radioactive elements may use representative mass numbers.
What assumptions should I check?
Supports all 118 elements. Does not parse charges, isotope labels, chemical equations or ambiguous plain-dot hydrate syntax.