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Energy
J to kJ
21 Joule to Kilojoule
Convert 21 Joules to Kilojoules
21 Joules (J)
1 J = 1.0e-03 kJ
=
0.021 Kilojoules (kJ)
1 kJ = 1,000 J
Data Energy converter
Convert:
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From:
Barrel of Oil Equivalent
Billion Barrel of Oil Equivalent
Billion Electron Volt
British Thermal Unit
British Thermal Unit
British Thermal Unit (39 °F)
British Thermal Unit (59 °F)
British Thermal Unit (60 °F)
British Thermal Unit (63 °F)
British Thermal Unit (ISO)
Btu Mean
Calorie
Calorie (15 °C)
Calorie (20 °C)
Calorie (3.98 °C)
Calorie (international table)
Calorie (mean)
Celsius Heat Unit
Cubic Centimetre of Atmosphere
Cubic Foot of Atmosphere
Cubic Foot of Natural Gas
Cubic Mile of Oil
Cubic Yard of Atmosphere
Dekatherm (EC)
Dekatherm (UK)
Dekatherm (US)
Electronvolt
Electron Volt
Erg
European Electrical Horsepower
Exaelectron Volt
Exajoule
Foot Poundal
Foot Pound Force
Gallon-Atmosphere
Gallon-Atmosphere (imperial)
Gigaelectron Volt
Gigajoule
Gigawatt Hour
Hartree
Horsepower Hour
Inch-Pound Force
Joule
Kilocalorie
Kiloelectron Volt
Kilogram-force Meter
Kilojoule
Kilowatt-Hour
Litre-Atmosphere
Mega Calorie
Megaelectron Volt
Megajoule
Megawatt Hour
Microjoule
Millijoule
Million Barrels of Oil Equivalent
Million British Thermal Units
Million Dekatherms (EC)
Million Dekatherms (UK)
Million Dekatherms (US)
Nanojoule
Newton Meters
Petaelectron Volt
Petajoule
Picojoule
Quad
Rydberg
Tablespoon of Oil Equivalent
Teraelectron Volt
Terajoule
Terawatt Hour
Therm (E.C.)
Thermie
Therm (UK)
Therm (U.S.)
Thousand Barrels of Oil Equivalent
Thousand British Thermal Units
Thousand Dekatherms (EC)
Thousand Dekatherms (UK)
Thousand Dekatherms (US)
Ton of Coal Equivalent
Ton of Oil Equivalent
Ton of TNT
Watt Hour
Watt Second
Yottaelectron Volt
Yottajoule
Zettaelectron Volt
Zettajoule
To:
Barrel of Oil Equivalent
Billion Barrel of Oil Equivalent
Billion Electron Volt
British Thermal Unit
British Thermal Unit
British Thermal Unit (39 °F)
British Thermal Unit (59 °F)
British Thermal Unit (60 °F)
British Thermal Unit (63 °F)
British Thermal Unit (ISO)
Btu Mean
Calorie
Calorie (15 °C)
Calorie (20 °C)
Calorie (3.98 °C)
Calorie (international table)
Calorie (mean)
Celsius Heat Unit
Cubic Centimetre of Atmosphere
Cubic Foot of Atmosphere
Cubic Foot of Natural Gas
Cubic Mile of Oil
Cubic Yard of Atmosphere
Dekatherm (EC)
Dekatherm (UK)
Dekatherm (US)
Electronvolt
Electron Volt
Erg
European Electrical Horsepower
Exaelectron Volt
Exajoule
Foot Poundal
Foot Pound Force
Gallon-Atmosphere
Gallon-Atmosphere (imperial)
Gigaelectron Volt
Gigajoule
Gigawatt Hour
Hartree
Horsepower Hour
Inch-Pound Force
Joule
Kilocalorie
Kiloelectron Volt
Kilogram-force Meter
Kilojoule
Kilowatt-Hour
Litre-Atmosphere
Mega Calorie
Megaelectron Volt
Megajoule
Megawatt Hour
Microjoule
Millijoule
Million Barrels of Oil Equivalent
Million British Thermal Units
Million Dekatherms (EC)
Million Dekatherms (UK)
Million Dekatherms (US)
Nanojoule
Newton Meters
Petaelectron Volt
Petajoule
Picojoule
Quad
Rydberg
Tablespoon of Oil Equivalent
Teraelectron Volt
Terajoule
Terawatt Hour
Therm (E.C.)
Thermie
Therm (UK)
Therm (U.S.)
Thousand Barrels of Oil Equivalent
Thousand British Thermal Units
Thousand Dekatherms (EC)
Thousand Dekatherms (UK)
Thousand Dekatherms (US)
Ton of Coal Equivalent
Ton of Oil Equivalent
Ton of TNT
Watt Hour
Watt Second
Yottaelectron Volt
Yottajoule
Zettaelectron Volt
Zettajoule
Convert
Convert:
(Please enter a number)
From:
Barrel of Oil Equivalent
Billion Barrel of Oil Equivalent
Billion Electron Volt
British Thermal Unit
British Thermal Unit
British Thermal Unit (39 °F)
British Thermal Unit (59 °F)
British Thermal Unit (60 °F)
British Thermal Unit (63 °F)
British Thermal Unit (ISO)
Btu Mean
Calorie
Calorie (15 °C)
Calorie (20 °C)
Calorie (3.98 °C)
Calorie (international table)
Calorie (mean)
Celsius Heat Unit
Cubic Centimetre of Atmosphere
Cubic Foot of Atmosphere
Cubic Foot of Natural Gas
Cubic Mile of Oil
Cubic Yard of Atmosphere
Dekatherm (EC)
Dekatherm (UK)
Dekatherm (US)
Electronvolt
Electron Volt
Erg
European Electrical Horsepower
Exaelectron Volt
Exajoule
Foot Poundal
Foot Pound Force
Gallon-Atmosphere
Gallon-Atmosphere (imperial)
Gigaelectron Volt
Gigajoule
Gigawatt Hour
Hartree
Horsepower Hour
Inch-Pound Force
Joule
Kilocalorie
Kiloelectron Volt
Kilogram-force Meter
Kilojoule
Kilowatt-Hour
Litre-Atmosphere
Mega Calorie
Megaelectron Volt
Megajoule
Megawatt Hour
Microjoule
Millijoule
Million Barrels of Oil Equivalent
Million British Thermal Units
Million Dekatherms (EC)
Million Dekatherms (UK)
Million Dekatherms (US)
Nanojoule
Newton Meters
Petaelectron Volt
Petajoule
Picojoule
Quad
Rydberg
Tablespoon of Oil Equivalent
Teraelectron Volt
Terajoule
Terawatt Hour
Therm (E.C.)
Thermie
Therm (UK)
Therm (U.S.)
Thousand Barrels of Oil Equivalent
Thousand British Thermal Units
Thousand Dekatherms (EC)
Thousand Dekatherms (UK)
Thousand Dekatherms (US)
Ton of Coal Equivalent
Ton of Oil Equivalent
Ton of TNT
Watt Hour
Watt Second
Yottaelectron Volt
Yottajoule
Zettaelectron Volt
Zettajoule
To:
Barrel of Oil Equivalent
Billion Barrel of Oil Equivalent
Billion Electron Volt
British Thermal Unit
British Thermal Unit
British Thermal Unit (39 °F)
British Thermal Unit (59 °F)
British Thermal Unit (60 °F)
British Thermal Unit (63 °F)
British Thermal Unit (ISO)
Btu Mean
Calorie
Calorie (15 °C)
Calorie (20 °C)
Calorie (3.98 °C)
Calorie (international table)
Calorie (mean)
Celsius Heat Unit
Cubic Centimetre of Atmosphere
Cubic Foot of Atmosphere
Cubic Foot of Natural Gas
Cubic Mile of Oil
Cubic Yard of Atmosphere
Dekatherm (EC)
Dekatherm (UK)
Dekatherm (US)
Electronvolt
Electron Volt
Erg
European Electrical Horsepower
Exaelectron Volt
Exajoule
Foot Poundal
Foot Pound Force
Gallon-Atmosphere
Gallon-Atmosphere (imperial)
Gigaelectron Volt
Gigajoule
Gigawatt Hour
Hartree
Horsepower Hour
Inch-Pound Force
Joule
Kilocalorie
Kiloelectron Volt
Kilogram-force Meter
Kilojoule
Kilowatt-Hour
Litre-Atmosphere
Mega Calorie
Megaelectron Volt
Megajoule
Megawatt Hour
Microjoule
Millijoule
Million Barrels of Oil Equivalent
Million British Thermal Units
Million Dekatherms (EC)
Million Dekatherms (UK)
Million Dekatherms (US)
Nanojoule
Newton Meters
Petaelectron Volt
Petajoule
Picojoule
Quad
Rydberg
Tablespoon of Oil Equivalent
Teraelectron Volt
Terajoule
Terawatt Hour
Therm (E.C.)
Thermie
Therm (UK)
Therm (U.S.)
Thousand Barrels of Oil Equivalent
Thousand British Thermal Units
Thousand Dekatherms (EC)
Thousand Dekatherms (UK)
Thousand Dekatherms (US)
Ton of Coal Equivalent
Ton of Oil Equivalent
Ton of TNT
Watt Hour
Watt Second
Yottaelectron Volt
Yottajoule
Zettaelectron Volt
Zettajoule
Convert
More information from the unit converter
Q: How many Joules in a Kilojoule?
The answer is
1,000
Kilojoule
Q: How do you convert 21 Joule (J) to Kilojoule (kJ)?
21 Joule is equal to 0.021 Kilojoule. Formula to convert 21 J to kJ is
21 / 1000
Q: How many Joules in 21 Kilojoules?
The answer is
21,000
Joules
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