⚗️ Molecular Weight Calculator

Calculate average molecular weight and exact mass

Examples: H2O, C6H12O6, Ca(OH)2, (NH4)2SO4, C12H22O11
Formula:
Average Molecular Weight
g/mol
Exact Mass (Monoisotopic)
Da
Elemental Composition
ℹ️ How to Use:
  • Enter element symbols with proper capitalization (e.g., Ca not CA)
  • Use numbers to indicate quantity (e.g., H2O for water)
  • Use parentheses for groups (e.g., Ca(OH)2)
  • Nested parentheses are supported (e.g., Fe4[Fe(CN)6]3)
  • Average weight uses standard atomic weights from IUPAC
  • Exact mass uses most abundant isotope for each element