Molecular Weight from Formula

Client-side parser handling parentheses and subscripts. IUPAC standard atomic weights bundled.

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Formula and source

MW = sum over elements (atomic_weight[element] * count). Formula parser supports parentheses and integer subscripts.

IUPAC Standard Atomic Weights 2021. Bundled in IUPAC_ATOMIC_WEIGHTS (data/lab/iupac-atomic-weights.json).

Audience

This tile is built for laboratory and the adjacent professions in the Bench Science and Laboratory Math group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.