Energy is defined as the capacity to do work. In other terms, it is a property by virtue of which a work gets done. There are many forms of energy known till date such as mechanical, nuclear, thermal, chemical etc.. Energy cannot be created nor be destroyed, it can only be transferred from one form to the other. Energy meters or power meters are used to measure energy. We use energy in the form of food we consume, electricity we use and work we do on a regular basis. This energy conversion tool will help you get accurate unit conversions.
joule [J]</strong>, the SI unit of Energy, this unit is quite smaller to use, for instance, energy required to lift an apple can be measured in joules
1 kilojoule [kJ] = 1000 joule [J], this unit is used to measure the energy content we obtain from food and other eatables.
1 calorie (nutritional) = 4186.8 joule [J], most commonly used for nutritional purposes by people who are training for weight gain/loss.
1 kilocalorie (IT) [kcal (IT)] = 4186.8 joule [J], used to represent the energy content of various ingredients in food products.
1 foot-pound [ft*lbf] = 1.3558179483 joule [J], used as a unit of Torque, it also finds its applications to express the energy of ballistic bullets.