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BTU
calorie (cal)
kilocalorie (kcal)
joule (J)
kilojoule (kJ)
megajoule (MJ)
gigajoule (GJ)
watt hour (Wh)
kilowatt hour (kWh)
electronvolt (eV)
erg
foot-pound
nutrition calorie (Cal)
ton of TNT (tn)
The energy "work" refers to one of the two physical quantities necessary for the correct description of the interrelationship - always mutual - between two entities or physical systems.
The unit of energy in the international system of units is the joule (J). The joule is a derivative unit, equivalent to 1 newton meter or 1 kilogram square meter per second square.