Molecular Weight Calculator
Estimate the molecular weight from a simple chemical formula (e.g. H2O, CO2, NaCl) by summing atomic weights.
Input Data
Formula
Results
18.015
Molar mass M = 18.015 g/mol.
At a glance:Molecular weight = Σ(atom count × atomic weight). This tool supports simple formulas (e.g. H2O, CO2). Complementary to mole and molarity.
Formula
M = Σ nᵢ·Aᵢ.
How to Use
- Enter the chemical formula.
- The tool gives the molecular weight.
Case Studies
H2O → 18.015
2×1.008 + 15.999 = 18.015.
FAQ
Parentheses?
This version does not support parentheses (e.g. Ca(OH)2).
Relation to mole?
Mole uses M; this finds that M.
Applications?
Balancing, concentration.
Precision?
3 decimal places.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.