Convert kilojoules to kilocalories
Converting kilojoules to kilocalories is a common energy task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 kJ equals 0.239006 kcal, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert kilojoules to kilocalories
To convert kilojoules to kilocalories, multiply the number of kilojoules by 0.239006. For example, 10 kJ × 0.239006 = 2.39006 kcal.
kcal = kJ × 0.239006
- Write down the value in kilojoules you want to convert.
- Multiply it by 0.239006 (the exact kJ→kcal factor).
- The result is your value in kilocalories. Check it below with the converter or the table.
Conversion table
Common values of kilojoules and their equivalents in kilocalories:
| kJ | kcal |
|---|---|
| 1 | 0.239006 |
| 2 | 0.478011 |
| 3 | 0.717017 |
| 4 | 0.956023 |
| 5 | 1.19503 |
| 10 | 2.39006 |
| 20 | 4.78011 |
| 25 | 5.97514 |
| 50 | 11.9503 |
| 100 | 23.9006 |
| 250 | 59.7514 |
| 500 | 119.503 |
About these units
Kilojoule (kJ). A kilojoule is 1,000 joules, the practical unit for food energy in Australia and Europe and for mechanical work. One kilocalorie equals 4.184 kilojoules.
Kilocalorie (kcal). A kilocalorie equals 1,000 small calories and is the 'Calorie' seen on food labels. An adult needs roughly 2,000–2,500 kcal per day, depending on activity.
Frequently asked questions
How do I convert kilojoules to kilocalories?
To convert kilojoules to kilocalories, multiply the number of kilojoules by 0.239006. For example, 10 kJ × 0.239006 = 2.39006 kcal. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many kilocalories are in 1 kilojoule?
1 kJ = 0.239006 kcal. That is the fixed relationship used by this converter and by international standards.
How many kilojoules are in 1 kilocalorie?
1 kcal = 4.184 kJ. If you are converting in the opposite direction, use our Kilocalorie to Kilojoule converter for the dedicated table and FAQ.
Is the kilojoules to kilocalories conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.239006 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is kilojoule used for?
A kilojoule is 1,000 joules, the practical unit for food energy in Australia and Europe and for mechanical work. One kilocalorie equals 4.184 kilojoules.