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
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.