Power and Energy
caltokJ
Convert thermochemical calories (cal) to kilojoules (kJ).
Factor1 cal = 0.004184 kJ
Converter
cal
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kJ
Rendered to 6 significant figures.
Formula
Formula
kJ = cal × 0.004184
Multiply any value in thermochemical calories by 0.004184 to obtain the value in kilojoules.
Worked example
Convert 1000 cal to kJ.
- 01Start with 1000 cal.
- 02Multiply by the conversion factor: 1000 × 0.004184 = 4.184 kJ.
Result1000 cal = 4.184 kJ
Conversion table
| cal | kJ |
|---|---|
| 1 | 0.004184 |
| 2 | 0.008368 |
| 5 | 0.02092 |
| 10 | 0.04184 |
| 20 | 0.08368 |
| 50 | 0.2092 |
| 100 | 0.4184 |
| 200 | 0.8368 |
| 500 | 2.092 |
| 1000 | 4.184 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cal to kJ?
1 cal equals 0.004184 kJ. To convert, multiply the value in thermochemical calories by 0.004184.
How do I convert 1 cal to kJ?
1 cal = 0.004184 kJ. For any value, multiply by 0.004184.
How do I convert kJ back to cal?
Divide by the same factor — or equivalently, multiply by 239.0057. So 1 kJ = 239.006 cal.
When would I need to convert thermochemical calorie to kilojoule?
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).