thermochemical kilocalorie to International Table BTU
Convert thermochemical kilocalorie (kcal) to International Table BTU (BTU IT). Use an editable energy converter, conversion formula, and reference table.
1 kcal = 3.965666831 BTU IT
Conversion formula
One thermochemical kilocalorie equals 3.965666831 International Table BTU. Multiply your value in thermochemical kilocalorie by this factor to get International Table BTU. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 thermochemical kilocalorie:5 × 3.965666831 = 19.82833416 BTU IT
Conversion table
| thermochemical kilocalorie (kcal) | International Table BTU (BTU IT) |
|---|---|
| 0.01 | 0.03965666831 |
| 0.1 | 0.3965666831 |
| 1 | 3.965666831 |
| 2 | 7.931333663 |
| 5 | 19.82833416 |
| 10 | 39.65666831 |
| 25 | 99.14167078 |
| 50 | 198.2833416 |
| 100 | 396.5666831 |
| 1000 | 3,965.666831 |
About these measurements
Energy can be transferred through work, heating, or electrical processes.
The base reference used here is the joule. One thermochemical kilocalorie is 4,184 base units; one International Table BTU is 1,055.055853 base units.
Important distinctions
Calorie and BTU definitions vary. These pages label thermochemical calories and International Table BTUs explicitly.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert kcal to BTU IT?
Multiply the quantity in kcal by 3.965666831. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the International Table BTU to thermochemical kilocalorie converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
