Joule to Kilojoule

1 J = 0.001 kJ

Value

From

Precision & format

Significant figures

Notation

1 J equals

0.001kJ

All 21 units

JouleJ
1
KilojoulekJ
0.001
MegajouleMJ
0.000001
GigajouleGJ
1 × 10⁻⁹
MillijoulemJ
1,000
Calorie (thermochemical)cal
exactly 4.184 J
0.2390057361
Kilocalorie (thermochemical)kcal
food Calorie
0.0002390057361
Calorie (IT)cal (IT)
International Table
0.2388458966
Kilocalorie (IT)kcal (IT)
0.0002388458966
Watt-hourWh
0.0002777777778
Kilowatt-hourkWh
2.777777778 × 10⁻⁷
Megawatt-hourMWh
2.777777778 × 10⁻¹⁰
BTU (IT)BTU
International Table
0.0009478171203
BTU (thermochemical)BTU (th)
0.0009484514148
Therm (US)thm
100 000 BTU
9.48043428 × 10⁻⁹
Foot-poundft·lbf
0.7375621493
Ergerg
10,000,000
ElectronvolteV
6.241509074 × 10¹⁸
KiloelectronvoltkeV
6.241509074 × 10¹⁵
MegaelectronvoltMeV
6,241,509,074,000
Tonne of oil equivalenttoe
2.388458966 × 10⁻¹¹

Joule to Kilojoule table

Common Joule values converted to Kilojoule
Joule (J)	Kilojoule (kJ)
1	0.001
2	0.002
5	0.005
10	0.01
20	0.02
50	0.05
100	0.1
250	0.25
500	0.5
1,000	1

How the conversion works

Multiply the joule figure by 0.001 to get kilojoule. Every factor on this site is anchored to the SI base unit for energy, so the same number is used everywhere it appears.

Going the other way, 1 kJ = 1,000 J — see kilojoule to joule.

See all 21 energy units →