Convert Joules to Kilocalories

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

Results in Kilocalories:
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1 J = 0.000239 kcal

How to Convert Joules to Kilocalories

To convert a joule measurement to a kilocalorie measurement, multiply the energy by the conversion ratio. One joule is equal to 0.000239 kilocalories, so use this simple formula to convert:

kilocalories = joules × 0.000239

The energy in kilocalories is equal to the joules multiplied by 0.000239.

For example, here's how to convert 5 joules to kilocalories using the formula above.
5 J = (5 × 0.000239) = 0.001195 kcal

Joules and kilocalories 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 kilocalorie, is equal to the heat needed to raise the temperature of one kilogram of water from 14.5 to 15.5 degrees Celsius.

Kilocalories can be abbreviated as kcal, for example 1 kilocalorie can be written as 1 kcal.

When being used to measure nutrition or metabolic processes, the large calorie is used, which is equal to one kilocalorie.

Joule Measurements and Equivalent Kilocalorie Conversions

Common joule values converted to the equivalent kilocalorie value
Joules Kilocalories
1 J 0.000239 kcal
2 J 0.000478 kcal
3 J 0.000717 kcal
4 J 0.000956 kcal
5 J 0.001195 kcal
6 J 0.001434 kcal
7 J 0.001673 kcal
8 J 0.001912 kcal
9 J 0.002151 kcal
10 J 0.00239 kcal
11 J 0.002629 kcal
12 J 0.002868 kcal
13 J 0.003107 kcal
14 J 0.003346 kcal
15 J 0.003585 kcal
16 J 0.003824 kcal
17 J 0.004063 kcal
18 J 0.004302 kcal
19 J 0.004541 kcal
20 J 0.00478 kcal
21 J 0.005019 kcal
22 J 0.005258 kcal
23 J 0.005497 kcal
24 J 0.005736 kcal
25 J 0.005975 kcal
26 J 0.006214 kcal
27 J 0.006453 kcal
28 J 0.006692 kcal
29 J 0.006931 kcal
30 J 0.00717 kcal
31 J 0.007409 kcal
32 J 0.007648 kcal
33 J 0.007887 kcal
34 J 0.008126 kcal
35 J 0.008365 kcal
36 J 0.008604 kcal
37 J 0.008843 kcal
38 J 0.009082 kcal
39 J 0.009321 kcal
40 J 0.00956 kcal

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 Calories
1 J is equal to 0.239006 calories
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