Power and Energy
kJtoJ
Convert kilojoules (kJ) to joules (J).
Factor1 kJ = 1000 J
Converter
kJ
Accepts numbers or expressions, e.g. 150 + 14.7
Result
J
Rendered to 6 significant figures.
Formula
Formula
J = kJ × 1000
Multiply any value in kilojoules by 1000 to obtain the value in joules.
Worked example
Convert 5 kJ to J.
- 01Start with 5 kJ.
- 02Multiply by the conversion factor: 5 × 1000 = 5000 J.
Result5 kJ = 5000 J
Conversion table
| kJ | J |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from kJ to J?
1 kJ equals 1000 J. To convert, multiply the value in kilojoules by 1000.
How do I convert 1 kJ to J?
1 kJ = 1000 J. For any value, multiply by 1000.
How do I convert J back to kJ?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 J = 0.001 kJ.
When would I need to convert kilojoule to joule?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).