Convert kilojoules to calories
Converting kilojoules to calories 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 239.006 cal, 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 calories
To convert kilojoules to calories, multiply the number of kilojoules by 239.006. For example, 10 kJ × 239.006 = 2,390.06 cal.
cal = kJ × 239.006
- Write down the value in kilojoules you want to convert.
- Multiply it by 239.006 (the exact kJ→cal factor).
- The result is your value in calories. Check it below with the converter or the table.
Conversion table
Common values of kilojoules and their equivalents in calories:
| kJ | cal |
|---|---|
| 1 | 239.006 |
| 2 | 478.011 |
| 3 | 717.017 |
| 4 | 956.023 |
| 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 |
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.
Calorie (cal). The small calorie is the energy needed to raise one gram of water by 1 °C, defined as exactly 4.184 joules. It is mostly used in chemistry and heat calculations.
Frequently asked questions
How do I convert kilojoules to calories?
To convert kilojoules to calories, multiply the number of kilojoules by 239.006. For example, 10 kJ × 239.006 = 2,390.06 cal. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many calories are in 1 kilojoule?
1 kJ = 239.006 cal. That is the fixed relationship used by this converter and by international standards.
How many kilojoules are in 1 calorie?
1 cal = 0.004184 kJ. If you are converting in the opposite direction, use our Calorie to Kilojoule converter for the dedicated table and FAQ.
Is the kilojoules to calories conversion exact?
Yes. Both units are defined by international agreement, so the factor of 239.006 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.