Empirical Formula Calculator (C=62.58% H=9.63% O=27.79%)

Calculated Empirical Formula

Empirical Formula: C6H11O2 (HEXANOIC ACID)
Element Entered Percentage Actual Percentage
Carbon 62.58 62.58
Hydrogen 9.63 9.63
Oxygen 27.79 27.79


This program determines both empirical and molecular formulas. To calculate the empirical formula, enter the composition (e.g. C=40%, H=6.67%, O=53.3%) of the compound. Enter an optional molar mass to find the molecular formula.

  • Percentages can be entered as decimals or percentages (i.e. 50% can be entered as .50 or 50%.)
  • To determine the molecular formula, enter the appropriate value for the molar mass.

How To Determine Empirical/Molecular Formulas

Read our article on how to determine empirical and molecular formulas.

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