Calorie to Joule Converter
1 Calorie = 4.184 Joules. To convert Calories to Joules, multiply by 4.184.
Result updates as you type
Recent:
1 Calorie = 4.184 Joule
Formula
To convert Calories to Joules, multiply the value by 4.184. One Calorie equals 4.184 Joules.
J = cal × 4.184
For a quick mental estimate, multiply Calories by about 4.2 — the exact factor is 4.184.
Worked examples
- 1 Calorie = 4.184 Joules
- 5 Calories = 20.92 Joules
- 10 Calories = 41.84 Joules
- 100 Calories = 418.4 Joules
Calories to Joules table
| Calories (cal) | Joules (J) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 10 | 41.84 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1046 |
| 500 | 2092 |
| 1000 | 4184 |
About Calorie and Joule
Both the Calorie (cal) and the Joule (J) measure energy. One Calorie is equal to 4.184 Joules, so you can convert any measurement by multiplying by 4.184. The calculator above updates instantly, and the reference table lists common Calorie-to-Joule values for quick lookups.
Unit definitions
- Calorie (cal)
- The Calorie (cal) is a unit of energy equal to 4.184 Joules.
- Joule (J)
- The Joule (J) is the reference unit for energy in this converter — every other energy unit is defined relative to it.
Frequently asked questions
- How do you convert Calories to Joules?
- Multiply the number of Calories by 4.184. For example, 1 Calorie × 4.184 = 4.184 Joules.
- How many Joules are in a Calorie?
- There are 4.184 Joules in one Calorie.
- What is 10 Calories in Joules?
- 10 Calories is equal to 41.84 Joules.
- How do you convert Joules back to Calories?
- Multiply the number of Joules by 0.23900574 to get Calories. One Joule equals 0.23900574 Calories.