Molecular Weight Calculator
Calculate molecular weight from a chemical formula. Get an elemental breakdown and instant results.
Result
Molecular Weight:
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Molecular Weight Tips
What is Molecular Weight?
Molecular weight (molar mass) is the sum of atomic weights of all atoms in a molecule. Unit: g/mol.
How to Calculate
Add up (count × atomic weight) for each element in the formula. Example: H2O = 2×1.008 + 1×15.999 = 18.015 g/mol.
Examples
CO2: 44.009 g/mol. Glucose (C6H12O6): 180.156 g/mol.