# Energy Unit Converters

## All-in-One Energy Converter

This all-in-one energy converter lets you calculate all energy units at once. Convert between energy units including btu, calorie, electron volt, erg, gigajoule, joule, kilo Btu, kilocalorie, kilo electron volt, kilojoule, kilowatt hour, mega Btu, megacalorie, mega electron volt, megajoule, megawatt hour, quad, therm, watt hour, and watt second.

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## All Energy Converters

The energy converters below provide more detail about converting between the individual energy units. Each one includes a definition of the individual energy units, step-by-step instructions on performing the conversion, conversion examples, together with conversion charts and other visualisations.

## What Energy Units Are Supported?

Name | Symbol | Measurement System | Description |
---|---|---|---|

erg | erg | Non-SI Metric | An erg is a unit of energy and mechanical work in the centimeter-gram-second (CGS) system of units. It is equal to the amount of work done by a force of one dyne applied over a distance of one centimeter. In other words, an erg is a very small unit of energy. |

joule | J | International System of Units (SI) / Metric System | A joule (J) is the standard unit of energy in the International System of Units (SI). It is defined as the amount of work done when a force of one newton is applied over a distance of one meter in the direction of the force. In other words, one joule is equal to the energy transferred when one watt of power is dissipated for one second. |

kilojoule | kJ | International System of Units (SI) / Metric System | A kilojoule (kJ) is a metric unit of energy in the International System of Units (SI). One kilojoule is equal to 1,000 joules. It is commonly used in nutrition and chemistry to express the energy content of foods and the energy released or absorbed in chemical reactions. |

megajoule | MJ | International System of Units (SI) / Metric System | A megajoule (MJ) is a metric unit of energy in the International System of Units (SI). One megajoule is equal to 1,000,000 joules or 1×10^{6} joules. The prefix "mega-" signifies a factor of one million, so a megajoule is a large unit of energy, often used in contexts where significant amounts of energy are involved. |

gigajoule | GJ | International System of Units (SI) / Metric System | A gigajoule (GJ) is a metric unit of energy in the International System of Units (SI). One gigajoule is equal to 1,000,000,000 joules or 1×10^{9} joules. The prefix "giga-" signifies a factor of one billion, so a gigajoule represents a very large amount of energy. |

calorie | cal | Non-SI Metric | A calorie (cal) is a unit of energy commonly used in nutrition. It represents the amount of energy required to raise the temperature of one gram of water by one degree Celsius (or one degree Kelvin). In the context of nutrition, the term "calorie" usually refers to a kilocalorie, which is equal to 1,000 calories in scientific terms. |

kilocalorie | kcal | Non-SI Metric | A kilocalorie (kcal), commonly referred to as a Calorie with an uppercase "C," is a unit of energy used in the field of nutrition and dietary measurement. It represents the amount of energy required to raise the temperature of one kilogram of water by one degree Celsius. In scientific terms, 1 kilocalorie is equal to 1,000 calories (lowercase "c"), which are the smaller units used in physics. |

megacalorie | Mcal | Non-SI Metric | A megacalorie (Mcal) is a unit of energy equivalent to one million calories (cal) or one thousand kilocalories (kcal). It represents a very large amount of energy and is often used in the context of large-scale energy measurements, particularly in the fields of nutrition and food industry, where significant quantities of energy need to be calculated. |

watt hour | Wh | Non-SI Metric | A watt-hour (Wh) is a unit of energy commonly used in the context of electricity consumption and production. It represents the amount of energy consumed or produced by a one-watt electrical device operating for one hour. |

kilowatt hour | kWh | Non-SI Metric | A kilowatt-hour (kWh) is a unit of energy commonly used for measuring electricity consumption. It represents one kilowatt (kW) of power used continuously for one hour. In other words, it is a measure of energy equivalent to 1,000 watt-hours or 3.6 million joules. |

megawatt hour | MWh | Non-SI Metric | A megawatt-hour (MWh) is a unit of energy equivalent to one million watt-hours or 1,000 kilowatt-hours. It is commonly used in the context of large-scale electricity generation, distribution, and consumption. |

watt second | Ws | International System of Units (SI) / Metric System | A watt-second (Ws), also known as a joule (J), is a unit of energy in the International System of Units (SI). It represents one watt of power expended for one second. Mathematically, it can be defined as: 1 watt-second (Ws) = 1 watt (W) × 1second (s) = 1 joule (J). |

btu | Btu | United States customary / Imperial system | BTU, or British Thermal Unit, is a unit of heat energy commonly used in the United States and some other countries. One BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit at a constant pressure. |

kilo Btu | kBtu | United States customary / Imperial system | Kilo BTU (kBtu) stands for one thousand British Thermal Units. It is a unit of energy equal to 1,000 BTUs. Just like the BTU, the kilo BTU is commonly used in the United States and some other countries to express energy content, especially in the context of heating, ventilation, air conditioning (HVAC), and energy consumption. |

therm | thm | United States customary / Imperial system | A therm is a unit of energy typically used in the United States to measure natural gas consumption. One therm is equal to 100,000 British Thermal Units (BTUs). It is a convenient way to express the vast amounts of energy contained in natural gas. |

mega Btu | MBtu | United States customary / Imperial system | Mega BTU (MBtu) stands for one million British Thermal Units. It is a unit of energy equal to 1,000,000 BTUs. The prefix "mega-" denotes a factor of one million, so a mega BTU represents a significant quantity of energy. |

quad | Q | United States customary / Imperial system | A quad is a unit of energy equal to one quadrillion (10^15) British Thermal Units (BTUs). It represents an enormous amount of energy and is primarily used in the United States to describe large quantities of energy production or consumption on a national scale. |

electron volt | eV | Non-SI Metric | An electron volt (eV) is a unit of energy used in physics and atomic sciences. It is the amount of kinetic energy gained or lost by an electron when it is accelerated through an electric potential difference of one volt. |

kilo electron volt | keV | Non-SI Metric | A kilo electron volt (keV) is a unit of energy commonly used in the field of atomic and particle physics. It is equal to one thousand electron volts (eV). Like the electron volt, the kilo electron volt is primarily used to measure energies at the atomic and molecular scale. |

mega electron volt | MeV | Non-SI Metric | A mega electron volt (MeV) is a unit of energy used in particle physics, nuclear physics, and related fields. It is equal to one million electron volts (eV). Mega electron volts are often used to describe the energy of subatomic particles and electromagnetic radiation, particularly in high-energy physics experiments and medical applications. |