Power and Energy
kcaltoBTU
Convert kilocalories (kcal) to International Table BTUs (BTU).
Factor1 kcal = 3.965667 BTU
Converter
kcal
Accepts numbers or expressions, e.g. 150 + 14.7
Result
BTU
Rendered to 6 significant figures.
Formula
Formula
BTU = kcal × 3.965667
Multiply any value in kilocalories by 3.965667 to obtain the value in International Table BTUs.
Worked example
Convert 100 kcal to BTU.
- 01Start with 100 kcal.
- 02Multiply by the conversion factor: 100 × 3.965667 = 396.567 BTU.
Result100 kcal = 396.567 BTU
Conversion table
| kcal | BTU |
|---|---|
| 1 | 3.9657 |
| 2 | 7.9313 |
| 5 | 19.828 |
| 10 | 39.657 |
| 20 | 79.313 |
| 50 | 198.28 |
| 100 | 396.57 |
| 200 | 793.13 |
| 500 | 1982.8 |
| 1000 | 3965.7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from kcal to BTU?
1 kcal equals 3.965667 BTU. To convert, multiply the value in kilocalories by 3.965667.
How do I convert 1 kcal to BTU?
1 kcal = 3.96567 BTU. For any value, multiply by 3.965667.
How do I convert BTU back to kcal?
Divide by the same factor — or equivalently, multiply by 0.2521644. So 1 BTU = 0.252164 kcal.
When would I need to convert kilocalorie to International Table BTU?
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).