Gas Composition

Reference Conditions T1/T2 (°C):
Methane (CH4): %
Ethane (C2H6): %
Propane (C3H8): %
Butane (C4H10): %
Hydrogen (H2): %
Hydrogen Sulfide (H2S): %
Nitrogen (N2): %
Carbon Dioxide (CO2): %
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Gas Properties

  • Enter the gas compositions in percentages and click Calculate

The Wobbe Index, Higher Heating Value (HHV), Lower Heating Value (LHV) are calculated with variable reference conditions (°C/°C). Check the standard reference conditions in your region to ensure correct results.

This calculator uses ISO 6976 to determine the Wobbe Index along with the Higher Heating Value, Density and Specific Gravity of a natural gas blend.

The air-fuel ratio is calculated on a volumetric basis with the oxygen in air assumed to be 20.946% by volume.

The calculator is used by Bright Sensors SA as part of the development of its Low-Cost and Compact Wobbe Index Sensor. For more information on the sensor, any questions about Wobbe Index sensing or feedback on this calculator please contact us.

The calculator is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall Bright Sensors SA be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with this calculator.