Molecular Weight Calculator — Molar Mass from Formulas
Calculate molecular weight from any chemical formula with element breakdown and mass percentage composition. Supports hydrates and parentheses.
Mol Weight
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Formula
H2O
Element Breakdown
[{"element":"H","count":2,"mass":2.016,"percentage":11.19067443796836},{"element":"O","count":1,"mass":15.999,"percentage":88.80932556203163}]
Total Atoms
3
Formula Units
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Molecular Weight
18.015g/mol
Mass Composition
Chemical Formula
H2OElement Breakdown
| Element | Count | Mass (g/mol) | Percentage | |
|---|---|---|---|---|
| O | 1 | 15.999 | 88.8% | |
| H | 2 | 2.016 | 11.2% | |
| Total | 3 | 18.015 | 100% |
Atomic Weight Reference
The molecular weight is calculated by summing each element’s atomic weight multiplied by its count in the formula. Atomic weights are standard values from the periodic table (IUPAC).
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