Convert Joules to Calories

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

Results 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 joule measurement to a calorie measurement, multiply the energy by the conversion ratio. One joule is equal to 0.239006 calories, so use this simple formula to convert:

calories = joules × 0.239006

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

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

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


The joule is the energy equal to the force on an object of one newton at a distance of one meter. 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.


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.

Joule Measurements and Equivalent Calorie Conversions

Common joule values converted to the equivalent calorie value
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

More Joule Energy Conversions

Convert to Kilojoules
1 J is equal to 0.001 kilojoules
Convert to Megajoules
1 J is equal to 1.0E-6 megajoules
Convert to Gigajoules
1 J is equal to 1.0E-9 gigajoules
Convert to Kilocalories
1 J is equal to 0.000239 kilocalories
Convert to Megacalories
1 J is equal to 2.3901E-7 megacalories
Watts x Time
Convert to Watt-hours
1 J is equal to 0.000278 watt-hours
Convert to Kilowatt-hours
1 J is equal to 2.7778E-7 kilowatt-hours
Convert to Megawatt-hours
1 J is equal to 2.7778E-10 megawatt-hours
Convert to Watt-seconds
1 J is equal to 1 watt-seconds
Thermal Units
Convert to British Thermal Units
1 J is equal to 0.000948 british thermal units
Convert to Million BTU
1 J is equal to 9.4782E-10 million BTU
Convert to Therms
1 J is equal to 9.4782E-9 therms
Convert to Quads
1 J is equal to 9.4782E-19 quads
Convert to Electronvolts
1 J is equal to 6,241,500,000,000,000,000 electronvolts
Convert to Kiloelectronvolts
1 J is equal to 6,241,500,000,000,000 kiloelectronvolts
Convert to Megaelectronvolts
1 J is equal to 6,241,509,343,260.2 megaelectronvolts