You may convert energy between a number of different units with our Energy Conversion Calculator. So, we all have some contact with energy. Also, we have contact with atoms or heat, or solar energy. But how to convert some heat or something like that into example kcal?

From the tiny energies of atoms at the microscopic level to the massive energies of nuclear weapons. In short, the scale of energy varies greatly in many facets of existence. As a result, a variety of alternative energy units have been created. Through this post you will learn about above mentioned terms, about solar energy conversion, energy conversion devices and so much more.

Meanwhile, we advise you to go to our home page and look at more different calculators, which will help you understand this topic. Further, some of these are Temperature Conversion, Nm to Joule’s, Grams to Calories, Natural Log or maybe Torr to Atm Conversion post.

What is an Energy Conversion?

It is the process of changing one type of energy into another. Because energy is a conserved variable, any change in energy in a system can only be achieved by removing or adding energy. For example, energy from nuclear and fossil fuel sources may be used in a variety of ways, including:

  • Heating/cooling;
  • Rotational/propulsive energy;
  • Electrification.

Energy transformation is another term for energy conversion.

Law of Conversion of Energy

According to the rule, energy cannot be generated or destroyed. It can only be transferred from one type of energy to another. Unless energy is introduced from the outside, a system always possesses the same quantity of energy.

This is especially perplexing in the situation of non-conservative forces. In which energy is transformed from mechanical to thermal while the overall energy remains constant. Energy can only be used by converting it from one form to another.

The following equation, then, determines the quantity of energy in any system:


So, the equation symbols have the following meaning

  • The total internal energy of a system is known as UT,
  • Ui is a system’s initial internal energy,
  • The work done by or on the system is denoted by the letter W,
  • The heat added to or withdrawn from the system is denoted by Q.

Types of Energy Conversion

In short, there are many different types of energy everywhere around us, and these energy sources may be turned into many forms as detailed below:

  • It is possible to transform light energy into heat energy.
  • Electrical energy may be turned to mechanical, light, and heat energy, among other things.
  • It is possible to transform chemical energy into electrical energy.
  • The conversion of thermal energy to heat energy is possible.
  • Mechanical energy may be transformed into electrical, potential, and other forms of energy.
  • Light and heat energy may be converted from nuclear energy.
  • Heat, chemical, and electrical energy can all be converted from natural solar energy.
  • The potential energy of gravity may be transformed into kinetic energy.


Here is also important to mention British thermal units (Btu). For instance, the heat content of fuel or power sources is measured in British thermal units (Btu). In short, this is the amount of heat that we need to increase the temperature of one pound of running water by one degree Fahrenheit at the densest temperature (approximately 39 degrees Fahrenheit).

Energy Conversion Formula

As for conversion formula, there is one simple and it’s written bellow:

E=P\cdot t

To sum up, in the formula above, P stands for power, and t stands for time.

Mass to Energy Conversion

Certainly, we won’t be discussing how to burn calories to lose weight, because we have a special post for this subject. But rather we will discuss the physics of mass and energy equivalency. The famous E = mc2 equation is certainly familiar to you. So, every mass in the world, according to Albert Einstein, is simply energy waiting to be released.

Although it is not yet possible, we can use this formula to represent energy in weight units. The following are the “weights” of 1 J of energy:

m=\frac {E}{c^2}\approx \frac{1J}{(2.998\cdot10^8\frac {m}{s})^2}

where c = 2.998 \cdot 10^8 \; m/s is the speed of light. Therefore, this unit of energy is used to represent the annihilation process, in which an electron me = 9.109 \cdot 10^{-31} \; kg collides with a positron (particle of equal mass but opposite charge) and produces two photons with a total energy of 1.022 MeV.

Moreover, our energy conversion calculator might help you figure it out! So, you should just keep in mind that the combined mass of the electron and positron will be 2 me.

Length to Energy Conversion

Matter waves are one of the most important aspects of quantum mechanics theory. Therefore, every moving particle with certain kinetic energy acts like a wave and has a given wavelength.

Also, in spectroscopy, the energy of a particle or light is commonly in reciprocal centimeters (cm-1). Therefore, Planck’s equation provides the formula for proper conversion:

E=h\cdot \frac{c}{\lambda}

Where λ is the wavelength, c is the light speed, and h = 6.6261 \cdot 10^{-34} \; m^2kg/s is the Planck constant. If we rewrite the preceding equation in a different way, we may state that 1 J of energy has the following properties:

\frac {1}{\lambda}=\frac {E}{h \cdot c}=\frac{1J}{6.6261\cdot10^{-34}m^2\frac {kg}{s}\cdot 2.998\cdot 10^8 \frac {m}{s}}=5.034\cdot10^{(22)}cm^{-1}

To sum up, using our energy conversion tool, you can see that a reciprocal centimeter describes relatively low energies.

Energy Unit Conversion – Table

Conversion Table: Energy
Unit NameRelation to joule [J]
atomic unit of energy [Eh]4.359744E-8 [J]
barrel of oil6.117863E+9 [J]
BTU [59°F]1054.804 [J]
BTU [international, British Thermal Unit]1055.05585262 [J]
BTU [ISO, British Thermal Unit]1054.5 [J]
BTU [mean, British Thermal Unit]1055.87 [J]
BTU [thermochemical, BTU]1054.35026444 [J]
calorie [cal][15°C]4.1852 [J]
calorie [20°C]4.182 [J]
calorie [international]4.1868 [J]
kilocalorie4184 [J]
calorie [international 1929]4.18604651162791 [J]
calorie [international 1956]4.1868 [J]
calorie [mean]4.19 [J]
calorie [thermochemical]4.184 [J]
celsius heat unit [CHU][thermochemical]1899.100534716 [J]
cubic foot of atmosphere2869.2044809344 [J]
cubic foot of natural gas1,055,055.85 [J]
cubic meter of atmosphere1.01325E-4 [J]
cubic yard of atmosphere7.746852E+4 [J]
electronvolt [eV]1.602176E-19 [J]
erg [erg][CGS]1E-7 [J]
foot pound [ft lbf]1.3558179483314 [J]
foot-pound force [ft lbf]1.3558179483314 [J]
foot-poundal [ft pdl]0.0421401100938048 [J]
gallon atmosphere [gal atm][imperial]460.63256925 [J]
gallon atmosphere [gal atm][US]383.5568490138 [J]
hartree [Eh]4.359744E-18 [J]
horsepower hour [hp h]2.647796E+6 [J]
inch-pound force [in lbf]0.112984829027617 [J]
joule [J]1 [J]
millijoule0.001 [J]
kilojoule1000 [J]
megajoule1E+6 [J]
large calories [Gcal]4186.8 [J]
liter atmosphere [l atm]101.325 [J]
quad1.05435E+18 [J]
rydberg [Ry]2.179872E-18 [J]
therm [EC]1.05435E+8 [J]
therm [US]1.054804E+8 [J]
thermie4.1868E+6 [J]
ton of coal2.9288E+10 [J]
ton of oil4.184E+10 [J]
ton of tnt [tTNT]4.184E+9 [J]
watt hour [Wh]3600 [J]
Energy unit conversion table

Can you convert gas into energy and how solar energy is converted?

Firstly, natural gas can be used in a variety of ways to generate energy. Secondly, the steam generating unit is the most basic type of natural gas-fired power generation. In this type fossil fuels are used in the boiler to heat water and produce steam, which is then used to generate energy, which is useful to drive the turbine.

Also, photovoltaic (PV) panels or mirrors that concentrate solar radiation are used in solar technologies to convert sunlight into electrical energy. Further, this energy can be converted into electricity or stored in batteries or thermal storage.

Energy Conversion Calculator – How to Use?

This calculator is really simple. So just follow steps:

  • Enter the value you have;
  • Select the value you want to convert to;
  • Calculator automatically calculates the rest.

Energy Conversion Calculator – Example

Do you need some energy conversion examples?

However, for our energy conversion example, to make it easier for you to understand this calculator we will give a very simple example. So let’s say we have 82.8 MJ.

Further, we want to know how many kcal and kWh it is.

So, thanks to this calculator, there is no more searching for formulas about kWh or kcal, nerves, headaches. In conclusion, you did the job by entering the data, and the calculator will calculate by itself. So we get that 82.9 MJ equals 19,790 kcal or 23 kWh.


How do you calculate energy conversions?

{Energy}={Power}\times {Time}

How do you convert kcal to energy?

4.18 kJ or 4,184 joules (J) = one cal (kcal). So, multiply calories by 4.18 to convert from calories to kJ. In order to convert kJ to calories, multiply kJ by 4.18. To sum up, medium-sized banana (118 grams) has 105 calories (kcal) and 439 kJ.

What are the three types of energy conversions?

It is possible to transform chemical energy in electrical energy. For instance, the conversion of thermal energy to heat energy is possible. Also, electrical energy, potential energy, and mechanical energy, all of those types we can transform.

Which organelles are involved in energy conversion?

Therefore, mitochondria and chloroplasts are cellular organelles involved in energy transformation.

What energy conversion occurs during photosynthesis?

In short, plants transform radiative energy into chemical energy during photosynthesis.

How do you convert energy into electricity?

Firstly, a flowing fluid-water, steam, combustion gases, or air-pushes a sequence of blades placed on a rotor shaft in a turbine generator. Further, the rotor shaft of a generator is spun/rotated by the force of the fluid on the blades. So, the rotor’s mechanical (kinetic) energy is converted to electrical energy via the generator.

How do you convert kJ to J?

In short, multiply the energy by the conversion ratio to convert a kilojoule measurement to a joule measurement. Further, the energy in joules is equivalent to 1,000 times the kilojoules.