How to convert calories to joules
To convert calories (cal) to joules (J), multiply the value in calories by 4.184.
J = cal × 4.184
Example: 10 cal = 41.84 J.
You can also type 10 cal to J into the smart calculator, or mix units: 1 cal + 1 J.
Calories to Joules conversion table
| Calories | Joules |
|---|---|
| 0.01 cal | 0.04184 J |
| 0.1 cal | 0.4184 J |
| 0.25 cal | 1.046 J |
| 0.5 cal | 2.092 J |
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 3 cal | 12.552 J |
| 4 cal | 16.736 J |
| 5 cal | 20.92 J |
| 6 cal | 25.104 J |
| 7 cal | 29.288 J |
| 8 cal | 33.472 J |
| 9 cal | 37.656 J |
| 10 cal | 41.84 J |
| 12 cal | 50.208 J |
| 15 cal | 62.76 J |
| 20 cal | 83.68 J |
| 25 cal | 104.6 J |
| 30 cal | 125.52 J |
| 40 cal | 167.36 J |
| 50 cal | 209.2 J |
| 60 cal | 251.04 J |
| 75 cal | 313.8 J |
| 100 cal | 418.4 J |
| 250 cal | 1,046 J |
| 500 cal | 2,092 J |
| 1,000 cal | 4,184 J |
Converting joules back to calories
1 J = 0.2390057361 cal. See the Joules to Calories converter, or press the swap button above.
About the units
Calorie (cal)
The small (thermochemical) calorie: exactly 4.184 joules.
Joule (J)
The SI unit of energy: one newton acting over one meter.
Energy is the capacity to do work. The SI unit is the joule. Food energy is labelled in kilocalories (Calories with a capital C) or kilojoules, electricity is billed in kilowatt-hours, and heating often uses BTU or therms.
Questions and answers
How many joules are in a calorie?
One calorie (cal) equals 4.184 joules (J).
How do I convert calories to joules?
To convert calories to joules, multiply the value in calories by 4.184. The formula is J = cal × 4.184. For example, 10 cal = 41.84 J.
What is 10 cal in J?
10 calories is 41.84 joules.
Which is bigger, a calorie or a joule?
A calorie is bigger: 1 cal = 4.184 J.
Are Calories on food labels the same as calories?
No. The food Calorie (capital C) is a kilocalorie: 1,000 small calories, or 4.184 kilojoules.
Does this cal to J converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.