Joules to Kilojoules Converter
EngineeringJoules, calories, kilowatt-hours and more.
How to convert Joules to Kilojoules
Multiply the joules value by 0.001: 1 J = 0.001 kJ. Going the other way, 1 kJ = 1,000 J, so divide by 0.001 or use the Kilojoules to Joules converter.
About these units
Joules (J)
The joule is the SI unit of energy: the work done by a force of one newton over one meter. Lifting a small apple one meter takes about one joule.
Kilojoules (kJ)
A kilojoule is 1,000 joules. Food energy is labelled in kilojoules in many countries; 1 kJ is about 0.239 kilocalories.
Joules to Kilojoules conversion table
| 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 |
| 10 J | 0.01 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 50 J | 0.05 kJ |
| 100 J | 0.1 kJ |
| 500 J | 0.5 kJ |
| 1,000 J | 1 kJ |
More joules conversions
- Joules to Megajoules1 J = 1e-6 MJ
- Joules to Gigajoules1 J = 1e-9 GJ
- Joules to Millijoules1 J = 1,000 mJ
- Joules to Microjoules1 J = 1e+6 µJ
- Joules to Nanojoules1 J = 1e+9 nJ
- Joules to Calories1 J = 0.239006 cal
- Joules to Watt Hours1 J = 0.000277778 Wh
- Joules to British Thermal Units1 J = 0.000947813 BTU
- Joules to Ergs1 J = 1e+7 erg
See every unit on the Energy Converter.