Energy Converter

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Energy Conversion Formulas

1 Kilojoule (kJ) = 1,000 Joule (J)

1 Calorie (th) (cal) = 4.184 Joule (J)

1 Kilocalorie (th) (kcal) = 4,184 Joule (J)

1 Watt-hour (W·h) = 3,600 Joule (J)

1 Kilowatt-hour (kW·h) = 3,600,000 Joule (J)

1 Electron-volt (eV) = 1.602177e-19 Joule (J)

1 British Thermal Unit (BTU) = 1,055.05999999999995 Joule (J)

Joule (J)

Definition: Joule (J) is the base unit of Energy in the International System of Units (SI).

History/origin: The joule is the fundamental unit of Energy in the International System of Units.

Current use: The joule is used worldwide for scientific, engineering, and everyday measurements.

Kilojoule (kJ)

Definition: Kilojoule (kJ) is a metric prefix multiple of the Joule (J). 1 kJ = 1,000 J.

History/origin: The prefix "kJ" was adopted as part of the metric system to denote multiples and submultiples of base units.

Current use: It is widely used in countries that have adopted the metric system.

Calorie (th) (cal)

Definition: Calorie (th) (cal) is a unit of Energy. 1 cal = 4.184 J

History/origin: The calorie (th) is used in various scientific and engineering applications.

Current use: It is commonly used in various fields including science, engineering, and everyday measurements.

Kilocalorie (th) (kcal)

Definition: Kilocalorie (th) (kcal) is a unit of Energy. 1 kcal = 4,184 J

History/origin: The kilocalorie (th) is used in various scientific and engineering applications.

Current use: It is commonly used in various fields including science, engineering, and everyday measurements.

Watt-hour (W·h)

Definition: Watt-hour (W·h) is a unit of Energy. 1 W·h = 3,600 J

History/origin: The watt-hour is used in various scientific and engineering applications.

Current use: It is commonly used in various fields including science, engineering, and everyday measurements.

Kilowatt-hour (kW·h)

Definition: Kilowatt-hour (kW·h) is a unit of Energy. 1 kW·h = 3,600,000 J

History/origin: The kilowatt-hour is used in various scientific and engineering applications.

Current use: It is commonly used in various fields including science, engineering, and everyday measurements.

Electron-volt (eV)

Definition: Electron-volt (eV) is a unit of Energy. 1 eV = 1.602176634e-19 J

History/origin: The electron-volt is used in various scientific and engineering applications.

Current use: It is commonly used in various fields including science, engineering, and everyday measurements.

British Thermal Unit (BTU)

Definition: British Thermal Unit (BTU) is a unit of Energy. 1 BTU = 1,055.06 J

History/origin: The british thermal unit has been historically used in the imperial and US customary measurement systems.

Current use: It is primarily used in the United States and a few other countries.

Popular Energy Unit Conversions

Joule to Kilojoule (J to kJ) Joule to Calorie (th) (J to cal) Joule to Kilocalorie (th) (J to kcal) Joule to Watt-hour (J to W·h) Joule to Kilowatt-hour (J to kW·h) Joule to Electron-volt (J to eV) Joule to British Thermal Unit (J to BTU) Kilojoule to Joule (kJ to J) Kilojoule to Calorie (th) (kJ to cal) Kilojoule to Kilocalorie (th) (kJ to kcal) Kilojoule to Watt-hour (kJ to W·h) Kilojoule to Kilowatt-hour (kJ to kW·h) Kilojoule to Electron-volt (kJ to eV) Kilojoule to British Thermal Unit (kJ to BTU) Calorie (th) to Joule (cal to J) Calorie (th) to Kilojoule (cal to kJ) Calorie (th) to Kilocalorie (th) (cal to kcal) Calorie (th) to Watt-hour (cal to W·h) Calorie (th) to Kilowatt-hour (cal to kW·h) Calorie (th) to Electron-volt (cal to eV) Calorie (th) to British Thermal Unit (cal to BTU) Kilocalorie (th) to Joule (kcal to J) Kilocalorie (th) to Kilojoule (kcal to kJ) Kilocalorie (th) to Calorie (th) (kcal to cal) Kilocalorie (th) to Watt-hour (kcal to W·h) Kilocalorie (th) to Kilowatt-hour (kcal to kW·h) Kilocalorie (th) to Electron-volt (kcal to eV) Kilocalorie (th) to British Thermal Unit (kcal to BTU) Watt-hour to Joule (W·h to J) Watt-hour to Kilojoule (W·h to kJ) Watt-hour to Calorie (th) (W·h to cal) Watt-hour to Kilocalorie (th) (W·h to kcal) Watt-hour to Kilowatt-hour (W·h to kW·h) Watt-hour to Electron-volt (W·h to eV) Watt-hour to British Thermal Unit (W·h to BTU) Kilowatt-hour to Joule (kW·h to J) Kilowatt-hour to Kilojoule (kW·h to kJ) Kilowatt-hour to Calorie (th) (kW·h to cal) Kilowatt-hour to Kilocalorie (th) (kW·h to kcal) Kilowatt-hour to Watt-hour (kW·h to W·h) Kilowatt-hour to Electron-volt (kW·h to eV) Kilowatt-hour to British Thermal Unit (kW·h to BTU) Electron-volt to Joule (eV to J) Electron-volt to Kilojoule (eV to kJ) Electron-volt to Calorie (th) (eV to cal) Electron-volt to Kilocalorie (th) (eV to kcal) Electron-volt to Watt-hour (eV to W·h) Electron-volt to Kilowatt-hour (eV to kW·h) Electron-volt to British Thermal Unit (eV to BTU) British Thermal Unit to Joule (BTU to J) British Thermal Unit to Kilojoule (BTU to kJ) British Thermal Unit to Calorie (th) (BTU to cal) British Thermal Unit to Kilocalorie (th) (BTU to kcal) British Thermal Unit to Watt-hour (BTU to W·h) British Thermal Unit to Kilowatt-hour (BTU to kW·h) British Thermal Unit to Electron-volt (BTU to eV)