Kilojoule to Joule Converter
Convert kilojoule to joule instantly.
Standard energy units
joule 100000
calorie 23900.574
kilocalorie 23.901
watt-hour 27.778
kilowatt-hour 0.0278
BTU 94.781
Fun comparisons
apples eaten 🍎~ 0.29
hours of 100W bulb 💡~ 0.28
marathons run 🏃~ 0.03
full car tanks of fuel ⛽~ Less than 0.01
How to convert kilojoule to joule
Enter your energy value in kilojoule and see the result in joule instantly. Key reference points: 1 food Calorie equals 1 kcal (4.184 kJ), and 1 kilowatt-hour equals 3600 kJ (860 kcal).
Kilojoule is a practical metric energy unit used in nutrition and chemistry; joule is the SI base unit used in physics calculations. One kilojoule equals 1000 joules.
Need the opposite direction? Convert joule to kilojoule just as easily, or explore all our energy conversions.
Common kilojoule to joule conversions
| Kilojoule (kJ) | Joule (J) |
|---|---|
| 1 | 1000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 1 |
| 500 | 5 |
| 1000 | 1 |
Frequently asked questions
1 kilojoule equals 1000 joule.
Multiply by 1000. For example, 5 kJ = 5000 J.
8.4 kilojoules equals 8400 joules.
1 joule equals 0.001 kilojoule.
100 kilojoule equals 1 joule.