Calorific Value of Fuels.

The energy content (heating value) of petroleum products per unit mass is fairly constant, but their density differs significantly – hence the energy content of a liter, gallon, etc. varies between gasoline, diesel, kerosene.
Net calorific value is the quantity of heat liberated by the complete combustion of a unit of fuel when the water produced is assumed to remain as a vapor and the heat is not recovered.

Fuels and Petroleum Products


Specific Gravity/ Density Range Barrels per metric ton
Naphta Light 0.66 – 0.70 9.55 – 9.01
Crude Oils 0.8 – 0.97 8.0 – 6.6
Aviation gasoline 0.7 – 0.78 9.1 – 8.2
Kerosene 0.78 – 0.84 8.2 – 7.6
Diesel oil 0.82 – 0.92 7.8 – 6.9



Energy Density & Rough gross values


Specific Energy Density by mass (MJ/kg) Energy Density by volume (MJ/liter) in Btu per lb In BTU per US gallon
Crude Oil 41 – 46 29 – 37 18,300 – 19,500
Diesel 45 – 46 37 – 38 19,300 139,000
Gasoline 45 32 – 35 20,500 124,000
Jet Aviation Fuel 42 – 45 33 – 35 19,800 120,200
Kerosene 46 38
135,000
Biodiesel 38 – 43 33 – 36
127.000
Jatropha based Biodiesel 34 36.4 14,353
Jatropha Oil (CJO) 43 – 46 39.5

Rapeseed oil
34 – 36

Sunflower oil 39 33

Gas Oil

19,200
Fuel Oil (Bunker)

18,300
Coal (Bituminous) 27
10,200 – 14,600
Charcoal 30


Wood 15 – 18
6,000
Dry cow (camel) dung 10 – 15



1) Gasoline is formed from shorter and lighter chains of hydrocarbons than either diesel or fuel oil. Gasoline is lightweight, extremely volatile and evaporates quickly. These qualities contribute to gasoline powered engines having more horsepower and acceleration than an equivalent diesel engine.

Fuel comparison

Barrel of oil equivalent (boe)
The barrel of oil equivalent (BOE) is a unit of energy based on the approximate energy released by burning one barrel (42 US gallons or 158.9873 litres) of crude oil. The value is necessarily approximate as various grades of oil have slightly different heating values.
approx. 6.1 GJ

= 5.8 million Btu,
equivalent to 1,700 kWh or 1.7MWh
1 MT of oil Equivalent to about 7.2 barrels oil
= 42-45 GJ.
Petro-diesel
Density (average) = 0.84 g/ml ( = metric tonnes/m3)
= 130,500 Btu/gallon
= 36.4 MJ/liter or
= 42.8 GJ/t
coal (average) = 25.4 MT carbon per terajoule (TJ)
1.0 MT coal = 746 kg carbon
oil (average) = 19.9 MT carbon per terajoule (TJ)
1.0 US gallon gasoline
(0.833 Imperial gallon, 3.79 liter)
= 2.42 kg carbon
1.0 US gallon diesel/fuel oil
(0.833 Imperial gallon, 3.79 liter)
= 2.77 kg carbon
Natural gas (methane) = 14.4 metric tonnes carbon / TJ
1.0 cubic meter natural gas (methane) = 0.49 kg carbon
Bioenergy feedstocks 50% for woody crops or wood waste; approx. 45% for graminaceous (grass) crops or agricultural residues