Molecular weight calculator

Enter a molecular formula such as CaCl2·2H2O and press Enter, or click calculate.

  calculate | clear | digits: 5


Use regular numbers for subscripts.  Do not include ion valences or isotope weights.  Spaces and bonds are ignored.
Functional groups may be enclosed in parentheses: (CH3)3CH or brackets: [ClO2][ClO4]
Press Alt + period to enter a raised dot: CaCl2·2H2O
Groups that begin with numerals must be delimited by dots: 3BeO·Al2O3·6SiO2
Use decimals for non-integer molecules of crystallization: K2CO3·1.5H2O or non-stoichiometric compounds: Fe 0.95O
Output includes the molecular weight, and the element weights and proportions in Hill system order.

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