Name the unit in which calorific value of a fuel is expressed?

The calorific value of a fuel is typically expressed in units of energy per mass or volume. The most commonly used unit for this purpose is the kilojoule per gram (kJ/g), which represents the amount of energy released when one gram of a fuel is completely burned. Another commonly used unit is the megajoule per kilogram (MJ/kg), which is equivalent to one thousand kilojoules per gram. Additionally, the British thermal unit per pound (Btu/lb) is sometimes used in English-speaking countries, especially in the context of fossil fuel industries.