Fuel Gases - Combustion Values

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

Combustion Values Reference

Combustion (heat) values for some fuel gases. Use the calculator below to convert between different energy units.

Conversion Factor: 1 Btu/ft³ = 8.9 kcal/m³ = 3.73×10⁴ J/m³

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Combustion Value-- kcal/m³
Combustion Value-- J/m³
Fuel GasCombustion Value (Btu/ft³)Specific Gravity
Acetylene14980.91
Blast furnace gas921.02
Butane31841.95 (heavier than air)
Butylene (Butene)30771.94
Carbon Monoxide3230.97
Carburated Water Gas5500.63
Coke oven5700.40
Digester (Sewage) Gas6900.80
Ethane17831.06
Hydrogen3250.07
Manufactured Gas500 - 600—
Methane10110.55
Natural Gas950 - 11500.660 - 0.708 (lighter than air)
Propane25041.77
Propane-Butane Mix2500 - 3200—
Propylene (Propene)23321.45
Water Gas (bituminous)2610.71