Kilojoules to calories
Type a value in kilojoules to see it in calories straight away, or type in the second box to convert back.
Loading the tool…
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 kilojoules box.
- Read the result in calories as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
cal = kJ × 239.0057361
Multiply the value in kilojoules by 239.0057361 to get calories.
Example
To convert 25 kJ to calories: 25 × 239.0057361 = 5,975.14 cal.
Conversion table
| Kilojoules (kJ) | Calories (cal) |
|---|---|
| 1 | 239.006 |
| 2 | 478.011 |
| 3 | 717.017 |
| 5 | 1,195.03 |
| 10 | 2,390.06 |
| 20 | 4,780.11 |
| 25 | 5,975.14 |
| 50 | 11,950.3 |
| 100 | 23,900.6 |
| 250 | 59,751.4 |
| 500 | 119,503 |
| 1,000 | 239,006 |
About the units
- Kilojoule
- Exactly 1000 joules. It appears on food labels next to the calorie figure.
- Calorie
- The small calorie in its thermochemical definition, exactly 4.184 joules. The food calorie on labels equals 1000 of these.
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 calories are in one kilojoule?
1 kJ = 239.006 cal exactly.
How do I convert kilojoules to calories?
Use cal = kJ × 239.0057361. For example, 25 kJ = 5,975.14 cal.
How many kilojoules are in one calorie?
1 cal = 0.004184 kJ.
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.