Want to convert between joule, calorie, and BTU? With this Energy conversion calculator, you can easily convert the most common units of energy.

## What is Energy?

Energy is measured as the capacity to do work. It is a scalar quantity having SI unit the same as the work. joule(J)

Energy, in physics, is the property that must be transferred to an object to perform mechanical work on, or to heat, the object. Energy is usually measured in joules or ergs in the International System of Units (SI). Energy is often understood as being converted from some kind of potential energy to kinetic energy, for example in the transfer of an object from rest to motion, known as work, which is itself a kind of energy transfer. Energy can also be transferred between objects and converted into different types of energy, for example, it can be transformed into kinetic energy in the explosion of a stick of dynamite. Energy can be transferred between objects or particles by means of the classical fields of

**1 Kilojoule(KJ) = 10³ J**

## Unit of Energy

Unit of energy is joule (j) and CGS unit is erg but also Kilojoules(Kj), Megajoules(Mj), Calorie(Cal),Kilocalorie(kcal), Megacalorie(Mcal), Watt-hours(Wh), Electron volt(ev), British Thermal Unit(BTU).

## List of Energy Units with symbol

Units | Symbol |
---|---|

Joules | J |

Kilojoules | KJ |

Megajoules | MJ |

calorie | Cal |

Kilocalorie | Kcal |

Megacalorie | Mcal |

Watt hours | Wh |

Kilowatt-hours | kWh |

Megawatt hours | MWh |

Electron volt | ev |

Erg | erg |

British Thermal Units | BTU |

## Types of Energy

◉ The energy possessed by a body due to its temperature, is called heat energy

◉ The energy required to maintain the flow of current in an electrical appliance, is called electrical energy.

◉ The energy absorbed or released during a chemical reaction is called electrical energy.

◉ The energy absorbed or released during nuclear fission or nuclear fusion is called nuclear energy.

◉ The energy due to motion is called kinetic energy. (KE = 1 / mv²)

◉ The energy due to position (height and depth)is called potential energy. (PE = mgh)

## Law of conservation of Energy

According to the law of conservation, energy can only be transformed from one form to another form, It can neither be created nor be destroyed. e.g., When an electrical bulb is on then electrical energy is converted into heat energy and light energy.The total energy of any object is constant, PE + KE = constant.

## Mass-Energy Equivalence equation

The mass-energy equivalence is a formula in physics that expresses the concept that mass and energy are related to each other. It states that the mass of an object is a certain quantity of energy. According to Einstein’s theory of relativity, mass and energy are related in a simple way. If a small amount of mass is lost, a small amount of energy is lost as well, and if a small amount of energy is gained, a small amount of mass is gained. All of the rest mass of an object can be converted into energy, and vice versa. This means that any object which has mass has an equivalent amount of energy, and any object which is moving has an equivalent amount of mass. The formula says that the total energy of an object is equal to its mass multiplied by the speed of light squared(E = mc²).Where, c = speed of light.

## Energy Conversion Table

Joule | Kilojoule | Calorie | British Thermal Unit |
---|---|---|---|

1 J | 0.001 Kj | 0.23901 Cal | 0.00095 BTU |

2 J | 0.002 Kj | 0.47801 Cal | 0.00190 BTU |

3 J | 0.003 Kj | 0.71702 Cal | 0.00284 BTU |

4 J | 0.004 Kj | 0.65602 Cal | 0.00379 BTU |

5 J | 0.005 Kj | 1.19503 Cal | 0.00474 BTU |

6 J | 0.006 Kj | 1.43404 Cal | 0.00569 BTU |

7 J | 0.007 Kj | 1.67304 Cal | 0.00664 BTU |

8 J | 0.008 Kj | 1.91205 Cal | 0.00758 BTU |

9 J | 0.009 Kj | 2.15105 Cal | 0.00853 BTU |

10 J | 0.010 Kj | 2.39006 Cal | 0.00948 BTU |