Power and Energy
kcaltoJ
Convert kilocalories (kcal) to joules (J).
Factor1 kcal = 4184 J
Converter
kcal
Accepts numbers or expressions, e.g. 150 + 14.7
Result
J
Rendered to 6 significant figures.
Formula
Formula
J = kcal × 4184
Multiply any value in kilocalories by 4184 to obtain the value in joules.
Worked example
Convert 1 kcal to J.
- 01Start with 1 kcal.
- 02Multiply by the conversion factor: 1 × 4184 = 4184 J.
Result1 kcal = 4184 J
Conversion table
| kcal | J |
|---|---|
| 1 | 4184 |
| 2 | 8368 |
| 5 | 20920 |
| 10 | 41840 |
| 20 | 83680 |
| 50 | 2.0920e+5 |
| 100 | 4.1840e+5 |
| 200 | 8.3680e+5 |
| 500 | 2.0920e+6 |
| 1000 | 4.1840e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from kcal to J?
1 kcal equals 4184 J. To convert, multiply the value in kilocalories by 4184.
How do I convert 1 kcal to J?
1 kcal = 4184 J. For any value, multiply by 4184.
How do I convert J back to kcal?
Divide by the same factor — or equivalently, multiply by 0.0002390057. So 1 J = 0.000239006 kcal.
When would I need to convert kilocalorie 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).