Calorie (thermochemical) to Joule Converter
1 calorie is exactly 4.184 joules. Convert calories (cal) to joules (J) below: type a value and the result updates as you type.
cal to J calculator
Result
Calorie (thermochemical) to Joule conversion
1 cal = 4.184 Jone calorie in joules
1 J ≈ 0.2390057361 calone joule in calories
Calorie (thermochemical) (cal): Thermochemical calorie: exactly 4.184 joules.
Joule (J): SI derived unit: one newton-meter.
Source:Calorie (thermochemical): NIST Special Publication 811 (2008), Appendix B.8; Joule: SI Brochure, 9th edition (BIPM, 2019)
How to convert calories to joules
To convert calories to joules, multiply the number of calories by 4.184.
Formula
J = cal × 4.184
Examples
- 5 cal = 5 × 4.184 = 20.92 J
- 25 cal = 25 × 4.184 = 104.6 J
- 100 cal = 100 × 4.184 = 418.4 J
Calorie (thermochemical) to Joule conversion table
| Calorie (thermochemical) (cal) | Joule (J) |
|---|---|
| 0.1 cal | 0.4184 J |
| 0.5 cal | 2.092 J |
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 3 cal | 12.552 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 250 cal | 1046 J |
| 500 cal | 2092 J |
| 1000 cal | 4184 J |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many joules are in one calorie?
- One calorie is exactly 4.184 joules.
- How do I convert joules to calories?
- To convert joules to calories, divide the number of joules by 4.184. The formula is cal = J ÷ 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 calorie or a joule?
- A calorie is 4.184 times larger than a joule. In other words, a joule is about 0.2390057361 of a calorie.