Joules to kilocalories
Type a value in joules to see it in kilocalories straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the joules box.
- Read the result in kilocalories as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kcal = J × 0.0002390057361
Multiply the value in joules by 0.0002390057361 to get kilocalories.
Example
To convert 25 J to kilocalories: 25 × 0.0002390057361 = 0.00597514 kcal.
Conversion table
| Joules (J) | Kilocalories (kcal) |
|---|---|
| 1 | 0.000239006 |
| 2 | 0.000478011 |
| 3 | 0.000717017 |
| 5 | 0.00119503 |
| 10 | 0.00239006 |
| 20 | 0.00478011 |
| 25 | 0.00597514 |
| 50 | 0.0119503 |
| 100 | 0.0239006 |
| 250 | 0.0597514 |
| 500 | 0.119503 |
| 1,000 | 0.239006 |
About the units
- Joule
- The SI unit of energy, equal to the work done by a force of one newton moving an object one meter.
- Kilocalorie
- Equal to 1000 thermochemical calories, exactly 4184 joules. This is the everyday food calorie.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilocalories are in one joule?
1 J = 0.000239006 kcal exactly.
How do I convert joules to kilocalories?
Use kcal = J × 0.0002390057361. For example, 25 J = 0.00597514 kcal.
How many joules are in one kilocalorie?
1 kcal = 4,184 J.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.