Joule to Kilojoule Converter
Convert joule to kilojoule instantly.
Standard energy units
kilojoule 0.1
calorie 23.901
kilocalorie 0.0239
watt-hour 0.0278
kilowatt-hour 0
BTU 0.0948
Fun comparisons
apples eaten 🍎~ Less than 0.01
hours of 100W bulb 💡~ Less than 0.01
marathons run 🏃~ Less than 0.01
full car tanks of fuel ⛽~ Less than 0.01
How to convert joule to kilojoule
Enter your energy value in joule and see the result in kilojoule instantly. Key reference points: 1 food Calorie equals 1 kcal (4.184 kJ), and 1 kilowatt-hour equals 3600 kJ (860 kcal).
Joule is the SI base unit of energy used in physics and engineering; kilojoule is the practical metric unit used in nutrition labels and chemistry. One kilojoule equals 1000 joules.
Need the opposite direction? Convert kilojoule to joule just as easily, or explore all our energy conversions.
Common joule to kilojoule conversions
| Joule (J) | Kilojoule (kJ) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
Frequently asked questions
1 joule equals 0.001 kilojoule.
Multiply by 0.001. For example, 5 J = 0.005 kJ.
500 joules equals 0.5 kilojoules.
1 kilojoule equals 1000 joule.
100 joule equals 0.1 kilojoule.