Technical chemistry and processes

Chemical formula parser

Element composition, atom-count and molar-mass analysis for formulae with groups and hydrates.

Chemical formula parser

Calculate elemental composition, atom count and molar mass for one formula unit. Nested groups in (), [] and {} and hydrates using · or . are supported; ionic charges and isotopes are outside this model.

Use ASCII digits for subscripts. Whitespace is allowed only around a hydrate dot; a leading number is a multiplier only after a hydrate dot.

Examples:

The formula is filled in. Select Analyze to create a result; JSON and CSV exports become available afterwards.

Model, syntax and data source

The parser evaluates syntax and stoichiometric composition only; it does not establish structure, existence, stability or reaction balance.
Ionic charges and isotope-specific notation are rejected explicitly. Electron-mass corrections are not applied.
M = Σ nᵢAᵢ; mass fractions are wᵢ = nᵢAᵢ/M and remain unrounded before display.
Numeric dataset: Blue Obelisk Data Repository, CC0-1.0, pre-brand-freeze snapshot dated 2026-08-09; semantics checked against IUPAC/CIAAW.

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Chemical formula parser