The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it. The energy value is a characteristic for each substance. It is measured in units of energy per unit of the substance, usually mass, such as: kJ/kg, kJ/mol, kcal/kg, Btu/lb. Heating value is commonly determined by use of a bomb calorimeter.

Converter of calorific value

Enter value
BTU/cubic foot
calorie/cubic centimeter
CHU/cubic foot
joule/cubic meter
kilocalorie/cubic meter
kilojoule/cubic meter
megajoule/cubic meter
therm/cubic foot
therm/gallon (UK)

Heating value unit conversions:

  • kcal/kg = MJ/kg * 238.846
  • Btu/lb = kJ/kg * 2.3238
  • Btu/lb = kcals/kg * 1.8

The heat of combustion for fuels is expressed as the HHV, LHV, or GHV.


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