Energy Conversion

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


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What is Energy?

Energy is measured as the capacity to do work. It is a scalar quantity having an 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.

1 Kilojoule(KJ) = 10³ J

Unit of Energy

The unit of energy is joule (j) and the 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

Watt hoursWh
Megawatt hoursMWh
Electron voltev
British Thermal UnitsBTU

Types of Energy

  1. The energy possessed by a body due to its temperature is called heat energy
  2. The energy required to maintain the flow of current in an electrical appliance is called electrical energy.
  3. The energy absorbed or released during a chemical reaction is called electrical energy.
  4. The energy absorbed or released during nuclear fission or nuclear fusion is called nuclear energy.
  5. The energy due to motion is called kinetic energy. (KE = 1 / mv²)
  6. 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

Energy Conversion Table

JouleKilojouleCalorieBritish Thermal Unit
1 J0.001 Kj0.23901 Cal0.00095 BTU
2 J0.002 Kj0.47801 Cal0.00190 BTU
3 J0.003 Kj0.71702 Cal0.00284 BTU
4 J0.004 Kj0.65602 Cal0.00379 BTU
5 J0.005 Kj1.19503 Cal0.00474 BTU
6 J0.006 Kj1.43404 Cal0.00569 BTU
7 J0.007 Kj1.67304 Cal0.00664 BTU
8 J0.008 Kj1.91205 Cal0.00758 BTU
9 J0.009 Kj2.15105 Cal0.00853 BTU
10 J0.010 Kj2.39006 Cal0.00948 BTU