Joules to Kilojoules – joule to kilojoule Converter
1 J = 0.001 kJ
Formula
kJ = J × 0.001
Joules to kilojoules conversion table
| joules (J) | kilojoules (kJ) |
|---|---|
| 0.5 J | 0.0005 kJ |
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 3 J | 0.003 kJ |
| 5 J | 0.005 kJ |
| 10 J | 0.01 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 50 J | 0.05 kJ |
| 75 J | 0.075 kJ |
| 100 J | 0.1 kJ |
| 250 J | 0.25 kJ |
| 500 J | 0.5 kJ |
| 1000 J | 1 kJ |
| 5000 J | 5 kJ |
Joules and kilojoules are both energy units. One joule equals 0.001 kilojoules; enter any value above for an instant result, or use the table for common conversions.
Sanity-check examples
1 J = 0.001 kJ10 J = 0.01 kJ2.5 J = 0.0025 kJ
Common pitfalls and look-alike units
The "Calorie" on food labels and in fitness is the kilocalorie (kcal): 1 kcal = 4184 J, and the small calorie (cal) is one thousandth of it. This page uses the thermochemical calorie (1 cal = 4.184 J); the International Steam Table calorie is about 4.1868 J, so values differ slightly. The "degree" (度) on a Chinese electricity bill is one kilowatt-hour, and 1 kWh = 3600 kJ.
Frequently asked questions
How many kilojoules are in a joule?
1 joule (J) equals 0.001 kilojoule (kJ).
How do I convert joules to kilojoules?
Multiply the joule value by 0.001 to get kilojoule — for example, 2 joules = 0.002 kilojoule.
How do I convert kilojoules back to joules?
1 kilojoule equals 1000 joule. Use the swap button or the reverse conversion page linked on this page.
Related conversions
- Kilojoules to joules
- Joules to Kilowatt-hours
- Kilojoules to Calories (thermochemical)
- Kilojoules to Kilocalories (thermochemical)
- Kilojoules to Kilowatt-hours
- Calories (thermochemical) to Joules
- Calories (thermochemical) to Kilojoules
- Calories (thermochemical) to Kilocalories (thermochemical)
- Calories (thermochemical) to Kilowatt-hours