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Mass Fraction to Empirical Formula Calculator

Find the simplest whole-number ratio of atoms from % composition.

Converts mass percentages of C, H, O, and N into moles then divides by the smallest to get the empirical formula subscripts.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

%
%
%
%

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

moles_i = mass%_i / M_i; ratio_i = moles_i / min(moles)

In depth

Converts mass percentages of C, H, O, and N into moles then divides by the smallest to get the empirical formula subscripts.