Joules to Calories Converter

Enter the energy in joules below to get the value converted to calories.


Result in Calories:

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1 J = 0.239006 cal

Do you want to convert calories to joules?

How to Convert Joules to Calories

To convert a measurement in joules to a measurement in calories, multiply the energy by the following conversion ratio: 0.239006 calories/joule.

Since one joule is equal to 0.239006 calories, you can use this simple formula to convert:

calories = joules × 0.239006

The energy in calories is equal to the energy in joules multiplied by 0.239006.

For example, here's how to convert 5 joules to calories using the formula above.
calories = (5 J × 0.239006) = 1.195029 cal

How Many Calories Are in a Joule?

There are 0.239006 calories in a joule, which is why we use this value in the formula above.

1 J = 0.239006 cal

Joules and calories are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Joule?

The joule is the energy equal to the force on an object of one newton at a distance of one meter.[1] One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.

Learn more about joules.

What Is a Calorie?

One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as cal; for example, 1 calorie can be written as 1 cal.

Learn more about calories.

Joule to Calorie Conversion Table

Table showing various joule measurements converted to calories.
Joules Calories
1 J 0.239006 cal
2 J 0.478011 cal
3 J 0.717017 cal
4 J 0.956023 cal
5 J 1.195 cal
6 J 1.434 cal
7 J 1.673 cal
8 J 1.912 cal
9 J 2.1511 cal
10 J 2.3901 cal
11 J 2.6291 cal
12 J 2.8681 cal
13 J 3.1071 cal
14 J 3.3461 cal
15 J 3.5851 cal
16 J 3.8241 cal
17 J 4.0631 cal
18 J 4.3021 cal
19 J 4.5411 cal
20 J 4.7801 cal
21 J 5.0191 cal
22 J 5.2581 cal
23 J 5.4971 cal
24 J 5.7361 cal
25 J 5.9751 cal
26 J 6.2141 cal
27 J 6.4532 cal
28 J 6.6922 cal
29 J 6.9312 cal
30 J 7.1702 cal
31 J 7.4092 cal
32 J 7.6482 cal
33 J 7.8872 cal
34 J 8.1262 cal
35 J 8.3652 cal
36 J 8.6042 cal
37 J 8.8432 cal
38 J 9.0822 cal
39 J 9.3212 cal
40 J 9.5602 cal


  1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019,

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