Energy Converter

Energy Converter Online Tool - Convert various energy units such as joules, kilowatt-hours, watt-hours, and more with this free, user-friendly calculator.


Energy units are used to measure and quantify the amount of energy in various forms. Some of the most common energy units include:

  • Btu (th) - British Thermal Unit (thermochemical) is a unit of energy used in the United States and is equal to 1055 joules.
  • Btu (mean) - British Thermal Unit (mean) is a unit of energy used in the United Kingdom and is equal to 1054.6 joules.
  • Calories (IT) - International Table calorie is a unit of energy used in nutrition and is equal to 4184 joules.
  • Calories (th) - Thermochemical calorie is a unit of energy used in physics and is equal to 4.184 joules.
  • Calories (mean) - Mean calorie is a unit of energy used in chemistry and is equal to 4.190 joules.
  • Calories (15C) - 15 degree calorie is a unit of energy used in thermodynamics and is equal to 4.1855 joules.
  • Calories (20C) - 20 degree calorie is a unit of energy used in thermodynamics and is equal to 4.1868 joules.
  • Calories (food) - Food calorie is a unit of energy used in nutrition and is equal to 1000 calories (IT).
  • Centigrade heat units - A unit of energy used in thermodynamics and is equivalent to 1 calorie (th).
  • Electron volts [eV] - Electron volt is a unit of energy used in physics and is equal to 1.602 x 10^-19 joules.
  • Ergs - Erg is a unit of energy used in physics and is equal to 10^-7 joules.
  • Foot-pound force [ft lbf] - Foot-pound force is a unit of energy used in the United States and is equal to 1.356 joules.
  • Foot-poundals - Foot-poundal is a unit of energy used in thermodynamics and is equal to 1.356 joules.
  • Gigajoules [GJ] - Gigajoule is a unit of energy used in physics and is equal to 10^9 joules.
  • Horsepower hours - Horsepower hour is a unit of energy used in engineering and is equal to 2.685 x 10^6 joules.
  • Inch-pound force [in lbf] - Inch-pound force is a unit of energy used in the United States and is equal to 0.113 joules.
  • Joules [J] - Joule is a unit of energy used in physics and is the standard unit of energy in the International System of Units (SI).
  • Kilocalories (IT) - Kilocalorie (IT) is a unit of energy used in nutrition and is equal to 4184 joules.
  • Kilocalories (th) - Kilocalorie (th) is a unit of energy used in physics and is equal to 4.184 joules.
  • Kilogram-force meters - Kilogram-force meter is a unit of energy used in physics and is equal to 9.807 joules.
  • Kilojoules [kJ] - Kilojoule is a unit of energy used in physics and is equal to 10^3 joules.
  • Kilowatt hours [kWh] - Kilowatt hour is a unit of energy used in electricity and is equal to 3.6 x 10^6 joules.
  • Megajoules [MJ] - Megajoule is a unit of energy used in physics and is equal to 10^6 joules.
  • Newton meters [Nm] - Newton meter is a unit of energy used in physics and is equal to one joule.
  • Therms - Therm is a unit of energy used in the United States and is equal to 100,000 Btu (th).
  • Watt seconds [Ws] - Watt second is a unit of energy used in physics and is equal to one joule.
  • Watt hours [Wh] - Watt hour is a unit of energy used in electricity and is equal to 3600 joules.

It's important to note that converting between energy units requires a precise understanding of the underlying physics and thermodynamics. In addition, there are many other energy units that are used in different contexts, including units specific to certain industries, such as nuclear energy and renewable energy.



The unit conversion tool is a convenient and easily accessible solution for converting between various measurement units. Its quick and free online functionality adds to its user-friendly design, making it a valuable tool for anyone in need of unit conversions.