ZovaTool

Molecular Weight Calculator

Molecular Weight
18.015 g/mol
H × 22.016 g/mol (11.19%)
O × 115.999 g/mol (88.81%)

How to use the Molecular Weight Calculator

  1. Type any chemical formula — single elements, subscripts and nested parentheses are supported (e.g. Ca(NO3)2).
  2. See the molecular weight in g/mol plus per-element contributions and mass percent.
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Calculating molar mass

Molecular weight = sum of (atomic weight × subscript) for every element in the formula.

Our parser supports nested groups: Ca(NO3)2 → Ca + 2N + 6O = 164.09 g/mol.

Atomic weights are IUPAC 2021 standard values.