basic

Percent Mass of Element in Compound Calculator

% mass = (n · A_element) / M_compound × 100.

Compute the percent by mass of a single element in a chemical compound from the number of atoms of that element, its atomic mass, and the molar mass of the compound.

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

Inputs

g/mol
g/mol

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

% mass = (n · atomic_mass) / molar_mass · 100

In depth

Compute the percent by mass of a single element in a chemical compound from the number of atoms of that element, its atomic mass, and the molar mass of the compound.