Oxygen Requirement Calculator
Oxygen Requirement Calculator: Stoichiometric O2 Needed to Burn Fuel
Every fuel needs a specific mass of pure oxygen to burn completely, determined entirely by its elemental composition. This calculator applies the standard ultimate-analysis formula to compute the theoretical oxygen requirement per kilogram of fuel, the foundation for sizing oxy-fuel systems and cross-checking air supply calculations.
The Formula
O2 Required (kg/kg fuel) = 2.667 × C + 8 × H − O + S
where C, H, O, and S are the mass fractions of carbon, hydrogen, oxygen, and sulfur in the fuel.
Worked Example
A fuel is 75% carbon and 25% hydrogen by mass, with no oxygen or sulfur content.
O2 Required = 2.667(0.75) + 8(0.25) − 0 + 0 = 4.0 kg O2/kg fuel
How to Use This Calculator
- Enter the carbon mass fraction of the fuel (0-1).
- Enter the hydrogen mass fraction (0-1).
- Optionally enter the oxygen and sulfur mass fractions if present in the fuel.
- Click Calculate to get the stoichiometric oxygen requirement.
Related Calculations
Compare against the Stoichiometric Air Requirement Calculator, which converts this oxygen demand into an equivalent air requirement.