Joules to Kilojoules
Convert joules (J) to kilojoules (kJ). Type in either box; the other updates as you go.
1 joule equals0.001 kJ
1 kilojoule equals1,000 J
FormulakJ = J × 0.001
How to convert joules to kilojoules
To convert joules to kilojoules, multiply the number of joules by 0.001.
kJ = J × 0.001
Example
Convert 5 joules to kilojoules:
5 J × 0.001 = 0.005 kJ
Joule to kilojoule conversion chart
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 3 J | 0.003 kJ |
| 4 J | 0.004 kJ |
| 5 J | 0.005 kJ |
| 6 J | 0.006 kJ |
| 7 J | 0.007 kJ |
| 8 J | 0.008 kJ |
| 9 J | 0.009 kJ |
| 10 J | 0.01 kJ |
| 12 J | 0.012 kJ |
| 15 J | 0.015 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 30 J | 0.03 kJ |
| 40 J | 0.04 kJ |
| 50 J | 0.05 kJ |
| 60 J | 0.06 kJ |
| 70 J | 0.07 kJ |
| 75 J | 0.075 kJ |
| 80 J | 0.08 kJ |
| 90 J | 0.09 kJ |
| 100 J | 0.1 kJ |
| 150 J | 0.15 kJ |
| 200 J | 0.2 kJ |
| 250 J | 0.25 kJ |
| 500 J | 0.5 kJ |
| 1,000 J | 1 kJ |
Going the other way? See the kilojoules to joules chart.
About the units
Joule (J)
The joule is the SI unit of energy: the work done by a force of one newton over one meter.
Kilojoule (kJ)
A kilojoule is 1,000 joules. Food labels in Australia and Europe give energy in kJ next to kcal.
Frequently asked questions
How many kilojoules are in a joule?
There are 0.001 kilojoules in a joule.
How many joules are in a kilojoule?
There are 1,000 joules in a kilojoule.
How do you convert joules to kilojoules?
To convert joules to kilojoules, multiply the number of joules by 0.001.
What is 5 joules in kilojoules?
5 joules equals 0.005 kilojoules.
Convert between joules, calories, kilocalories, kilowatt-hours and BTU. Open the energy converter to see a value in every unit at once.