Molecular Weight from Formula

Client-side parser handling parentheses and subscripts.

Example

You enter

You get

Details, formula, and sources

IUPAC standard atomic weights bundled.

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).

Free at iupac.org/publications/journals/pac/. Element-by-element values published in Pure and Applied Chemistry.

Verify protocol against your lab's SOP before pipetting. A miscalculated dilution can ruin a run or a sample.

Field names used by the API: formula, molecular_weight

Details, formula, and sources

IUPAC standard atomic weights bundled.

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).

Free at iupac.org/publications/journals/pac/. Element-by-element values published in Pure and Applied Chemistry.

Verify protocol against your lab's SOP before pipetting. A miscalculated dilution can ruin a run or a sample.