Power and Energy
caltokcal
Convert thermochemical calories (cal) to kilocalories (kcal).
Factor1 cal = 0.001 kcal
Converter
cal
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kcal
Rendered to 6 significant figures.
Formula
Formula
kcal = cal × 0.001
Multiply any value in thermochemical calories by 0.001 to obtain the value in kilocalories.
Worked example
Convert 1000 cal to kcal.
- 01Start with 1000 cal.
- 02Multiply by the conversion factor: 1000 × 0.001 = 1 kcal.
Result1000 cal = 1 kcal
Conversion table
| cal | kcal |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 500 | 0.5 |
| 1000 | 1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cal to kcal?
1 cal equals 0.001 kcal. To convert, multiply the value in thermochemical calories by 0.001.
How do I convert 1 cal to kcal?
1 cal = 0.001 kcal. For any value, multiply by 0.001.
How do I convert kcal back to cal?
Divide by the same factor — or equivalently, multiply by 1000. So 1 kcal = 1000 cal.
When would I need to convert thermochemical calorie to kilocalorie?
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).