Kilojoules to Calories Converter
Convert kilojoules (kJ) to kilocalories (kcal) as you type — 1 kJ = 0.239006 kcal. Switch units, change the precision or copy the result.
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How to use this tool
Steps for using the Unit Converter.
- Enter a value in From — kilojoules are already selected.
- The result in kilocalories appears instantly. Change either unit to convert to anything else in energy.
- Use the swap button for the reverse conversion, and set the decimal places you need.
- Turn on Show formula to see the calculation, then copy or share the result.
Example
1 kJ to kcal
1 kJkcal = 1 ÷ 4.184 = 0.239006 kcalCommon use cases
- Food energy on nutrition labels (kJ and kcal).
- Electricity use and battery capacity in Wh and kWh.
- Heating and cooling loads in BTU.
Kilojoules to Calories conversion table
| Kilojoule (kJ) | Kilocalorie (kcal) |
|---|---|
| 0.1 kJ | 0.023901 kcal |
| 0.5 kJ | 0.119503 kcal |
| 1 kJ | 0.239006 kcal |
| 2 kJ | 0.478011 kcal |
| 3 kJ | 0.717017 kcal |
| 4 kJ | 0.956023 kcal |
| 5 kJ | 1.195029 kcal |
| 10 kJ | 2.390057 kcal |
| 15 kJ | 3.585086 kcal |
| Kilojoule (kJ) | Kilocalorie (kcal) |
|---|---|
| 20 kJ | 4.780115 kcal |
| 25 kJ | 5.975143 kcal |
| 50 kJ | 11.950287 kcal |
| 75 kJ | 17.92543 kcal |
| 100 kJ | 23.900574 kcal |
| 250 kJ | 59.751434 kcal |
| 500 kJ | 119.502868 kcal |
| 1,000 kJ | 239.005736 kcal |
Values rounded to 6 decimal places.
Related conversions
The units
- Kilojoule (kJ)
- 1,000 J. Part of the Metric system.
- Kilocalorie (kcal)
- 1,000 cal = 4,184 J (the food “Calorie”).
How to convert kilojoules to kilocalories
Food labels in Australia, Europe and elsewhere list energy in kJ next to kcal; the “Calories” on food are kilocalories, 1 kcal = 4.184 kJ.
To convert kilojoules to kilocalories, use kcal = kJ ÷ 4.184. One kilojoule equals 0.239006 kilocalories, and one kilocalorie equals 4.184 kilojoules.
Kilojoule (kJ): 1,000 J. Kilocalorie (kcal): 1,000 cal = 4,184 J (the food “Calorie”).
All energy units are on the energy converter.
Limitations
- Results are rounded to the decimal places you choose; the calculation itself keeps full precision.
Frequently asked questions
How many kilocalories are in a kilojoule?
1 kJ = 0.239006 kcal. Multiply kilojoules by 0.2390057361 (or use kcal = kJ ÷ 4.184).
How do I convert kilojoules to kilocalories?
Use kcal = kJ ÷ 4.184. For example, 1 kJ = 0.239 kcal and 10 kJ = 2.3901 kcal.
Is a food Calorie the same as a calorie?
No. A food Calorie (capital C) is a kilocalorie, 1,000 small calories or 4.184 kJ.
How many joules are in a kWh?
3,600,000 J (3.6 MJ).