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Theoretical (Stoichiometric) Combustion Air for a Fuel Calculator

Air (kg/kg fuel) = (2.667·C + 8·H − O + S) / 0.232.

Compute the theoretical (stoichiometric) mass of air required to completely combust 1 kg of a solid or liquid fuel from its ultimate-analysis mass fractions of carbon, hydrogen, oxygen, and sulphur. Theoretical O₂ (kg) = 2.667·C + 8·H − O + S; theoretical air = O₂ / 0.232 (since dry air is 23.2 wt-% O₂).

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

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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

Air = (2.667·C% + 8·H% − O% + S%) / (100 · 0.232) kg air per kg fuel.

In depth

Compute the theoretical (stoichiometric) mass of air required to completely combust 1 kg of a solid or liquid fuel from its ultimate-analysis mass fractions of carbon, hydrogen, oxygen, and sulphur. Theoretical O₂ (kg) = 2.667·C + 8·H − O + S; theoretical air = O₂ / 0.232 (since dry air is 23.2 wt-% O₂).