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Molecular Weight Calculator

Chemical Formula
Molecular Weight


Enter a commonly written chemical formula, as shown in the following example:
  1. H2O
  2. Na2SO4
  3. Fe3[Fe(CN)6]2
  4. Fe3(Fe(CN)6)2
Structured formulas also allow:
  1. CH2=C(CH3)2
  3. H3C-(CH2)7-CH=CH-(CH2)7-COOH
Symbols can be separated by spaces:

Na2 S O4 or Na 2 S O 4 are treated in the same way.

The formula contains a point showing monohydrate or other adducts.

such as CaSO4 1/2H2O.To enter use the format CaSO4(H2O)1/2, CaSO4(H2O)0.5, or CaSO4(H2O).5

Do not enter a whole number and a fraction to form a number, such as 1 1/2 (it will be 11/2 instead).Use 3/2 or 1.5 instead.