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Fuel Gases - Combustion Values

Combustion values for fuel gases like natural gas, propane and butane - Btu per cubic feet.

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Combustion (heat) values for some fuel gases:

Fuel GasCombustion Value
Specific Gravity
Acetylene 1498 0.91
Blast furnace gas 92 1.02
Butane 3184 1.95 (heavier than air)
Butylene (Butene) 3077 1.94
Carbon Monoxide 323 0.97
Carburated Water Gas 550 0.63
Coke oven 570 0.40
Digester (Sewage) Gas 690 0.80
Ethane 1783 1.06
Hydrogen 325 0.07
Manufactured Gas 500 - 600
Methane 1011 0.55
Natural Gas 950 - 1150 0.660 - 0.708 (lighter than air)
Propane 2504 1.77 
Propane-Butane Mix 2500 - 3200
Propylene (Propene) 2332 1.45
Water Gas (bituminous) 261 0.71
  • 1 Btu/ft3 = 8.9 kcal/m3 = 3.73x104 J/m3
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