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Stoichiometric Air-Fuel Ratio & Equivalence Ratio (λ) Combustion Calculator

Easily calculate and compute stoichiometric air-fuel ratio & equivalence ratio (λ) combustion calculator with accurate equations, live formulas, and expert guidance.

Number of carbon atoms in CxHyOz (e.g. 8 for iso-octane).

Number of hydrogen atoms (e.g. 18 for iso-octane).

Number of oxygen atoms (e.g. 1 for ethanol C2H6O).

Measured kg air consumed per kg fuel injected.

Calculated Result
1.06

Excess Air λ

Excess Air λ

1.06

Excess Air Lambda

1.065

Equivalence Ratio Phi

0.939

Stoichiometric Air Fuel Ratio

15.03

Mixture Regime

Lean (Excess Air, λ > 1.0)

1.06

Calculation Breakdown

  1. Applied FormulaCalculates the stoichiometric air-to-fuel ratio, excess air factor (lambda), and equivalence ratio (phi) for hydrocarbon fuels (CxHyOz).\lambda = \frac{(A/F)_{act}}{(A/F)_{stoich}}, \quad \phi = \frac{1}{\lambda} = \frac{(F/A)_{act}}{(F/A)_{stoich}}

Air-Fuel & Lambda Ratio Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.1Excess Air λ

What Is the Stoichiometric Air-Fuel Ratio & Equivalence Ratio (λ) Combustion Calculator?

This tool computes stoichiometric air-fuel ratio & equivalence ratio (λ) combustion calculator with high precision arithmetic.

How Does the Stoichiometric Air-Fuel Ratio & Equivalence Ratio (λ) Combustion Calculator Work?

Calculates the stoichiometric air-to-fuel ratio, excess air factor (lambda), and equivalence ratio (phi) for hydrocarbon fuels (CxHyOz).

Stoichiometric Air-Fuel Ratio & Equivalence Ratio (λ) Combustion Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

λ=(A/F)act(A/F)stoich,ϕ=1λ=(F/A)act(F/A)stoich\lambda = \frac{(A/F)_{act}}{(A/F)_{stoich}}, \quad \phi = \frac{1}{\lambda} = \frac{(F/A)_{act}}{(F/A)_{stoich}}

Calculates the stoichiometric air-to-fuel ratio, excess air factor (lambda), and equivalence ratio (phi) for hydrocarbon fuels (CxHyOz).

How to Use the Stoichiometric Air-Fuel Ratio & Equivalence Ratio (λ) Combustion Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Stoichiometric Air-Fuel Ratio & Equivalence Ratio (λ) Combustion Calculator Example

Input Values:

carbonAtomsX:8
hydrogenAtomsY:18
oxygenAtomsZ:0
actualAirFuelRatio:16.0
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required Excess Air λ.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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