Convert Joule to Kilojoule Online

About Joule to Kilojoule Conversion

This converter converts Joule (J) to Kilojoule (kJ). One Joule (J) equals 0.001 Kilojoule (kJ).

Formula:

1 Joule (J) = 0.001 Kilojoule (kJ)

Example:

1 J = 0.001 kJ
2 J = 0.002 kJ

Joule (J) to Kilojoule (kJ) Conversion

Convert Joule to Kilojoule using the exact conversion factor. This page provides the formula, worked examples, and real-world use cases for practical understanding.

Conversion Formula

Kilojoule = Joule × 0.001

To convert Joule (J) to Kilojoule (kJ), multiply the value by 0.001. This factor is obtained by comparing their exact meter definitions.

Worked Example

Convert 1 J to kJ.

  • Step 1: Write the formula: kJ = J × 0.001
  • Step 2: Substitute: 1 × 0.001
  • Step 3: Result: 0.001 kJ
So, 1 J = 0.001 kJ.

About the Units

Joule (J)

One Joule (J) equals 0.001 Kilojoule (kJ)

A widely used unit across scientific, engineering, and measurement contexts.

Kilojoule (kJ)

One Kilojoule (kJ) equals 1000 Joule (J)

A widely used unit across scientific, engineering, and measurement contexts.

Where This Conversion Is Used

  • Converting values from Joule to Kilojoule for engineering or scientific workflows.
  • Used when normalizing mixed-unit datasets requiring consistent Kilojoule representation.
  • Applied when comparing different measurement systems across tools and documents.

Frequently Asked Questions

How many Kilojoule (kJ) are in 1 Joule (J)?

1 J = 0.001 kJ.

What is the formula for converting Joule (J) to Kilojoule (kJ)?

Multiply the J value by 0.001.

Can I reverse the conversion?

Yes. 1 kJ = 1000 J.

Conclusion

By applying the conversion factor shown above, you can reliably convert Joule (J) to Kilojoule (kJ) for use in scientific analysis, engineering calculations, academic work, or daily measurements.

Quick Links for Unit Converters

Convert Joule to Other Units

Joule to Kilojoule

1 J = 0.001 kJ

1 Joule (J) = 0.001 Kilojoule (kJ)

1 J equals 0.001 kJ.

Joule to Megajoule

1 J = 0.000001 MJ

1 Joule (J) = 0.000001 Megajoule (MJ)

1 J equals 0.000001 MJ.

Joule to Gigajoule

1 J = 1e-9 GJ

1 Joule (J) = 1e-9 Gigajoule (GJ)

1 J equals 1e-9 GJ.

Joule to Watt-hour

1 J = 0.0002777777777777778 Wh

1 Joule (J) = 0.0002777777777777778 Watt-hour (Wh)

1 J equals 0.0002777777777777778 Wh.

Joule to Kilowatt-hour

1 J = 2.7777777777777776e-7 kWh

1 Joule (J) = 2.7777777777777776e-7 Kilowatt-hour (kWh)

1 J equals 2.7777777777777776e-7 kWh.

Joule to Megawatt-hour

1 J = 2.7777777777777777e-10 MWh

1 Joule (J) = 2.7777777777777777e-10 Megawatt-hour (MWh)

1 J equals 2.7777777777777777e-10 MWh.

Joule to Erg

1 J = 10000000 erg

1 Joule (J) = 10000000 Ergs

1 J equals 10000000 ergs.

Joule to Calorie

1 J = 0.2390057361376673 cal

1 Joule (J) = 0.2390057361376673 Calorie (cal)

1 J equals 0.2390057361376673 cal.

Joule to Kilocalorie

1 J = 0.0002390057361376673 kcal

1 Joule (J) = 0.0002390057361376673 Kilocalorie (kcal)

1 J equals 0.0002390057361376673 kcal.

Joule to British Thermal Unit

1 J = 0.0009478133944988911 BTU

1 Joule (J) = 0.0009478133944988911 British Thermal Unit (BTU)

1 J equals 0.0009478133944988911 BTU.

Joule to Foot-pound force

1 J = 0.7375621494575464 ft_lbf

1 Joule (J) = 0.7375621494575464 Foot-pound force (ft⋅lbf)

1 J equals 0.7375621494575464 ft_lbf.

Joule to Horsepower-hour

1 J = 3.7250648813175704e-7 hp_h

1 Joule (J) = 3.7250648813175704e-7 Horsepower-hour (hp⋅h)

1 J equals 3.7250648813175704e-7 hp_h.

Joule to Therm

1 J = 9.478133944988911e-9 therm_us

1 Joule (J) = 9.478133944988911e-9 Therm (US)

1 J equals 9.478133944988911e-9 therm_us.

Joule to Electronvolt

1 J = 6241509074460763000 eV

1 Joule (J) = 6241509074460763000 Electronvolts (eV)

1 J equals 6241509074460763000 eVs.

Joule to Kiloelectronvolt

1 J = 6241509074460763 keV

1 Joule (J) = 6241509074460763 Kiloelectronvolts (keV)

1 J equals 6241509074460763 keVs.

Joule to Megaelectronvolt

1 J = 6241509074460.763 MeV

1 Joule (J) = 6241509074460.763 Megaelectronvolts (MeV)

1 J equals 6241509074460.763 MeVs.

Joule to Gigaelectronvolt

1 J = 6241509074.460762 GeV

1 Joule (J) = 6241509074.460762 Gigaelectronvolts (GeV)

1 J equals 6241509074.460762 GeVs.

Joule to Tonne of Oil Equivalent

1 J = 2.3884589662749594e-11 toe

1 Joule (J) = 2.3884589662749594e-11 Tonne of Oil Equivalent (toe)

1 J equals 2.3884589662749594e-11 toe.

Joule to Tonne of Coal Equivalent

1 J = 3.412084237535656e-11 tce

1 Joule (J) = 3.412084237535656e-11 Tonne of Coal Equivalent (tce)

1 J equals 3.412084237535656e-11 tce.

Joule to Hartree

1 J = 229371227839632480 hartree

1 Joule (J) = 229371227839632480 Hartrees

1 J equals 229371227839632480 hartrees.

Convert Kilojoule to Other Units

Kilojoule to Joule

1 kJ = 1000 J

1 Kilojoule (kJ) = 1000 Joules (J)

1 kJ equals 1000 Js.

Kilojoule to Megajoule

1 kJ = 0.001 MJ

1 Kilojoule (kJ) = 0.001 Megajoule (MJ)

1 kJ equals 0.001 MJ.

Kilojoule to Gigajoule

1 kJ = 0.000001 GJ

1 Kilojoule (kJ) = 0.000001 Gigajoule (GJ)

1 kJ equals 0.000001 GJ.

Kilojoule to Watt-hour

1 kJ = 0.2777777777777778 Wh

1 Kilojoule (kJ) = 0.2777777777777778 Watt-hour (Wh)

1 kJ equals 0.2777777777777778 Wh.

Kilojoule to Kilowatt-hour

1 kJ = 0.0002777777777777778 kWh

1 Kilojoule (kJ) = 0.0002777777777777778 Kilowatt-hour (kWh)

1 kJ equals 0.0002777777777777778 kWh.

Kilojoule to Megawatt-hour

1 kJ = 2.7777777777777776e-7 MWh

1 Kilojoule (kJ) = 2.7777777777777776e-7 Megawatt-hour (MWh)

1 kJ equals 2.7777777777777776e-7 MWh.

Kilojoule to Erg

1 kJ = 10000000000 erg

1 Kilojoule (kJ) = 10000000000 Ergs

1 kJ equals 10000000000 ergs.

Kilojoule to Calorie

1 kJ = 239.0057361376673 cal

1 Kilojoule (kJ) = 239.0057361376673 Calories (cal)

1 kJ equals 239.0057361376673 cals.

Kilojoule to Kilocalorie

1 kJ = 0.2390057361376673 kcal

1 Kilojoule (kJ) = 0.2390057361376673 Kilocalorie (kcal)

1 kJ equals 0.2390057361376673 kcal.

Kilojoule to British Thermal Unit

1 kJ = 0.9478133944988911 BTU

1 Kilojoule (kJ) = 0.9478133944988911 British Thermal Unit (BTU)

1 kJ equals 0.9478133944988911 BTU.

Kilojoule to Foot-pound force

1 kJ = 737.5621494575464 ft_lbf

1 Kilojoule (kJ) = 737.5621494575464 Foot-pound forces (ft⋅lbf)

1 kJ equals 737.5621494575464 ft_lbves.

Kilojoule to Horsepower-hour

1 kJ = 0.00037250648813175706 hp_h

1 Kilojoule (kJ) = 0.00037250648813175706 Horsepower-hour (hp⋅h)

1 kJ equals 0.00037250648813175706 hp_h.

Kilojoule to Therm

1 kJ = 0.000009478133944988911 therm_us

1 Kilojoule (kJ) = 0.000009478133944988911 Therm (US)

1 kJ equals 0.000009478133944988911 therm_us.

Kilojoule to Electronvolt

1 kJ = 6.241509074460763e+21 eV

1 Kilojoule (kJ) = 6.241509074460763e+21 Electronvolts (eV)

1 kJ equals 6.241509074460763e+21 eVs.

Kilojoule to Kiloelectronvolt

1 kJ = 6241509074460763000 keV

1 Kilojoule (kJ) = 6241509074460763000 Kiloelectronvolts (keV)

1 kJ equals 6241509074460763000 keVs.

Kilojoule to Megaelectronvolt

1 kJ = 6241509074460762 MeV

1 Kilojoule (kJ) = 6241509074460762 Megaelectronvolts (MeV)

1 kJ equals 6241509074460762 MeVs.

Kilojoule to Gigaelectronvolt

1 kJ = 6241509074460.763 GeV

1 Kilojoule (kJ) = 6241509074460.763 Gigaelectronvolts (GeV)

1 kJ equals 6241509074460.763 GeVs.

Kilojoule to Tonne of Oil Equivalent

1 kJ = 2.3884589662749594e-8 toe

1 Kilojoule (kJ) = 2.3884589662749594e-8 Tonne of Oil Equivalent (toe)

1 kJ equals 2.3884589662749594e-8 toe.

Kilojoule to Tonne of Coal Equivalent

1 kJ = 3.4120842375356563e-8 tce

1 Kilojoule (kJ) = 3.4120842375356563e-8 Tonne of Coal Equivalent (tce)

1 kJ equals 3.4120842375356563e-8 tce.

Kilojoule to Hartree

1 kJ = 229371227839632500000 hartree

1 Kilojoule (kJ) = 229371227839632500000 Hartrees

1 kJ equals 229371227839632500000 hartrees.