How to use the combustion oxygen and air requirement calculator
Find how much oxygen and air a fuel needs to burn completely from its stoichiometry. Enter moles of fuel burned, moles of o₂ per mole of fuel in the fields above; the oxygen needed, air needed at stp (21% o₂) are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “combustion air requirement”, “oxygen needed for burning”, “air to fuel ratio”, “calculate combustion oxygen and air requirement”, “find oxygen needed”.
Formula
Variables
- nf — Moles of fuel burned (mol)
- ox — Moles of O₂ per mole of fuel (mol/mol)
Worked example
With moles of fuel burned = 1 mol, moles of o₂ per mole of fuel = 2 mol/mol, the calculator gives oxygen needed ≈ 2 mol; air needed at stp (21% o₂) ≈ 213.4667 L.
Frequently asked questions
What is the combustion oxygen and air requirement calculator used for?
Find how much oxygen and air a fuel needs to burn completely from its stoichiometry. It helps with questions such as “combustion air requirement”, “oxygen needed for burning”, “air to fuel ratio”.
What is the formula for the combustion oxygen and air requirement calculation?
Oxygen needed (mol) = nf × ox. Air needed at STP (21% O₂) (L) = [Oxygen needed] × 22.414 / 0.21. Here nf is moles of fuel burned (mol), ox is moles of o₂ per mole of fuel (mol/mol).
What inputs do I need for the combustion oxygen and air requirement calculator?
You need moles of fuel burned in mol, moles of o₂ per mole of fuel in mol/mol. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the combustion oxygen and air requirement calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the combustion oxygen and air requirement result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.