Molecular Weight Calculator

Atom count multiplied by atomic mass.

Choose a molecular-weight workflowUse a simple atom total or compose a common CHON molecular formula.

3 options

Atom count

Atomic mass

g/mol

MOLECULAR WEIGHT36 g/mol

atom count × atomic mass. Only inputs needed by this operation are shown.

Estimate based on the values shown

Formula checkedMolar mass sums element counts multiplied by standard atomic weights. Formula mode parses element symbols and integer subscripts; common chemicals provide exact presets.

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