Molecular Weight Calculator

Enter a chemical formula to calculate its molecular weight (molar mass) in g/mol. Supports parentheses, e.g. Ca(OH)₂.

Chemical Formula

Molecular Weight
18.0150 g/mol
Formula: H2O

Element Breakdown

SymbolElementCountAtomic WtContribution%
HHydrogen21.00802.016011.2%
OOxygen115.999015.999088.8%
Total18.0150100%

Common Molecular Weights

CompoundFormulaMW (g/mol)
WaterH2O18.015
Carbon DioxideCO244.01
Salt (NaCl)NaCl58.443
Sulfuric AcidH2SO498.079
GlucoseC6H12O6180.16
EthanolC2H5OH46.068
AmmoniaNH317.031
MethaneCH416.043