attojoule to thermochemical kilocalorie
Convert attojoule (aJ) to thermochemical kilocalorie (kcal). Use an editable energy converter, conversion formula, and reference table.
1 aJ = 2.39005736e-22 kcal
Conversion formula
One attojoule equals 2.39005736e-22 thermochemical kilocalorie. Multiply your value in attojoule by this factor to get thermochemical kilocalorie. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 attojoule:5 × 2.39005736e-22 = 1.19502868e-21 kcal
Conversion table
| attojoule (aJ) | thermochemical kilocalorie (kcal) |
|---|---|
| 0.01 | 2.39005736e-24 |
| 0.1 | 2.39005736e-23 |
| 1 | 2.39005736e-22 |
| 2 | 4.78011472e-22 |
| 5 | 1.19502868e-21 |
| 10 | 2.39005736e-21 |
| 25 | 5.9751434e-21 |
| 50 | 1.19502868e-20 |
| 100 | 2.39005736e-20 |
| 1000 | 2.39005736e-19 |
About these measurements
Energy can be transferred through work, heating, or electrical processes.
The base reference used here is the joule. One attojoule is 1e-18 base units; one thermochemical kilocalorie is 4,184 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 aJ to kcal?
Multiply the quantity in aJ by 2.39005736e-22. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the thermochemical kilocalorie to attojoule 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.
