Kilocalorie (thermochemical) to Kilojoule Converter
1 kilocalorie is exactly 4.184 kilojoules. Convert kilocalories (kcal) to kilojoules (kJ) below: type a value and the result updates as you type.
kcal to kJ calculator
Result
Kilocalorie (thermochemical) to Kilojoule conversion
1 kcal = 4.184 kJone kilocalorie in kilojoules
1 kJ ≈ 0.2390057361 kcalone kilojoule in kilocalories
Kilocalorie (thermochemical) (kcal): Exactly 1000 thermochemical calories (4184 joules).
Kilojoule (kJ): Exactly 1000 joules.
Source:Kilocalorie (thermochemical): NIST Special Publication 811 (2008), Appendix B.8; Kilojoule: SI Brochure, 9th edition (BIPM, 2019)
How to convert kilocalories to kilojoules
To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184.
Formula
kJ = kcal × 4.184
Examples
- 5 kcal = 5 × 4.184 = 20.92 kJ
- 25 kcal = 25 × 4.184 = 104.6 kJ
- 100 kcal = 100 × 4.184 = 418.4 kJ
Kilocalorie (thermochemical) to Kilojoule conversion table
| Kilocalorie (thermochemical) (kcal) | Kilojoule (kJ) |
|---|---|
| 0.1 kcal | 0.4184 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1046 kJ |
| 500 kcal | 2092 kJ |
| 1000 kcal | 4184 kJ |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many kilojoules are in one kilocalorie?
- One kilocalorie is exactly 4.184 kilojoules.
- How do I convert kilojoules to kilocalories?
- To convert kilojoules to kilocalories, divide the number of kilojoules by 4.184. The formula is kcal = kJ ÷ 4.184.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 4.184 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a kilocalorie or a kilojoule?
- A kilocalorie is 4.184 times larger than a kilojoule. In other words, a kilojoule is about 0.2390057361 of a kilocalorie.