basic

Molecular Weight from Empirical Formula Calculator

M = Σ nᵢ × Aᵣᵢ — sum of atomic masses × counts.

Calculates the molar mass of a compound by summing atomic masses for up to five elements with their stoichiometric coefficients. e.g. C₂H₆O → 2×12.011 + 6×1.008 + 15.999 = 46.068 g/mol.

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

Inputs

g/mol
g/mol
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

M = n₁·A₁ + n₂·A₂ + n₃·A₃ + …

In depth

Calculates the molar mass of a compound by summing atomic masses for up to five elements with their stoichiometric coefficients. e.g. C₂H₆O → 2×12.011 + 6×1.008 + 15.999 = 46.068 g/mol.