Kilocalories to kilojoules
Type a value in kilocalories to see it in kilojoules 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 kilocalories box.
- Read the result in kilojoules as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kJ = kcal × 4.184
Multiply the value in kilocalories by 4.184 to get kilojoules.
Example
To convert 25 kcal to kilojoules: 25 × 4.184 = 104.6 kJ.
Conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
About the units
- Kilocalorie
- Equal to 1000 thermochemical calories, exactly 4184 joules. This is the everyday food calorie.
- Kilojoule
- Exactly 1000 joules. It appears on food labels next to the calorie figure.
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 kilojoules are in one kilocalorie?
1 kcal = 4.184 kJ exactly.
How do I convert kilocalories to kilojoules?
Use kJ = kcal × 4.184. For example, 25 kcal = 104.6 kJ.
How many kilocalories are in one kilojoule?
1 kJ = 0.239006 kcal.
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.