Science Calculators

Molar Mass Calculator

Enter a chemical formula to calculate its molar mass from standard atomic weights.

H × 22.016 g/mol
O × 115.999 g/mol
18.015 g/mol

Uses standard IUPAC atomic weights. Doesn't support parentheses/hydrates yet — write out repeated groups directly (e.g. Ca(OH)2 as CaO2H2).

How to use this tool

  1. 1Enter a chemical formula using standard element symbols (e.g. H2O, NaCl, C6H12O6).
  2. 2See the per-element mass breakdown and total molar mass.

Frequently asked questions

Does this handle parentheses like Ca(OH)2?+

Not yet — write out repeated groups directly instead (e.g. enter Ca(OH)2 as CaO2H2).

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