thermochemical calorie to International Table BTU
Convert thermochemical calorie (cal) to International Table BTU (BTU IT). Use an editable energy converter, conversion formula, and reference table.
1 cal = 0.003965666831 BTU IT
Conversion formula
One thermochemical calorie equals 0.003965666831 International Table BTU. Multiply your value in thermochemical calorie by this factor to get International Table BTU. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 thermochemical calorie:5 × 0.003965666831 = 0.01982833416 BTU IT
Conversion table
| thermochemical calorie (cal) | International Table BTU (BTU IT) |
|---|---|
| 0.01 | 0.00003965666831 |
| 0.1 | 0.0003965666831 |
| 1 | 0.003965666831 |
| 2 | 0.007931333663 |
| 5 | 0.01982833416 |
| 10 | 0.03965666831 |
| 25 | 0.09914167078 |
| 50 | 0.1982833416 |
| 100 | 0.3965666831 |
| 1000 | 3.965666831 |
About these measurements
Energy can be transferred through work, heating, or electrical processes.
The base reference used here is the joule. One thermochemical calorie 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 cal to BTU IT?
Multiply the quantity in cal by 0.003965666831. 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 calorie 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.
