How to convert joules to calories
To convert joules (J) to calories (cal), divide the value in joules by 4.184.
cal = J ÷ 4.184
Example: 10 J = 2.390057361 cal.
You can also type 10 J to cal into the smart calculator, or mix units: 1 J + 1 cal.
Joules to Calories conversion table
| Joules | Calories |
|---|---|
| 0.01 J | 0.0023900574 cal |
| 0.1 J | 0.023900574 cal |
| 0.25 J | 0.059751434 cal |
| 0.5 J | 0.11950287 cal |
| 1 J | 0.23900574 cal |
| 2 J | 0.47801147 cal |
| 3 J | 0.71701721 cal |
| 4 J | 0.95602294 cal |
| 5 J | 1.1950287 cal |
| 6 J | 1.4340344 cal |
| 7 J | 1.6730402 cal |
| 8 J | 1.9120459 cal |
| 9 J | 2.1510516 cal |
| 10 J | 2.3900574 cal |
| 12 J | 2.8680688 cal |
| 15 J | 3.585086 cal |
| 20 J | 4.7801147 cal |
| 25 J | 5.9751434 cal |
| 30 J | 7.1701721 cal |
| 40 J | 9.5602294 cal |
| 50 J | 11.950287 cal |
| 60 J | 14.340344 cal |
| 75 J | 17.92543 cal |
| 100 J | 23.900574 cal |
| 250 J | 59.751434 cal |
| 500 J | 119.50287 cal |
| 1,000 J | 239.00574 cal |
Converting calories back to joules
1 cal = 4.184 J. See the Calories to Joules converter, or press the swap button above.
About the units
Joule (J)
The SI unit of energy: one newton acting over one meter.
Calorie (cal)
The small (thermochemical) calorie: exactly 4.184 joules.
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 calories are in a joule?
One joule (J) equals 0.2390057361 calories (cal).
How do I convert joules to calories?
To convert joules to calories, divide the value in joules by 4.184. The formula is cal = J ÷ 4.184. For example, 10 J = 2.3900574 cal.
What is 10 J in cal?
10 joules is 2.390057361 calories.
Which is bigger, a joule or a calorie?
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 J to cal 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.