Kilojoules to kilocalories
Multiply kilojoules by 0.239006 to get kilocalories.
1,000 kJ = 239.0057 kcal
How to convert kilojoules to kilocalories
The kilocalorie is one thousand thermochemical calories (4184 J) — the "Calorie" on food labels. The kilojoule is one thousand joules — the metric food-energy unit used outside the US.
Worked example — 1,000 kJ: 1,000 × 0.239006 = 239.0057 kcal.
Kilojoules to kilocalories table
| Kilojoules | Kilocalories |
|---|---|
| 1 kJ | 0.239006 kcal |
| 100 kJ | 23.9006 kcal |
| 250 kJ | 59.7514 kcal |
| 500 kJ | 119.5029 kcal |
| 1,000 kJ | 239.0057 kcal |
| 2,000 kJ | 478.0115 kcal |
| 4,000 kJ | 956.0229 kcal |
| 8,000 kJ | 1,912.0459 kcal |
| 8,400 kJ | 2,007.6482 kcal |
Reverse and related
About kilojoules and kilocalories
Kilojoule (kJ)
1 kJ = 0.239006 kcalDefinition. One thousand joules — the metric food-energy unit used outside the US
History and origin
The kilojoule is one thousand joules, the metric unit of energy built on the SI joule. It is the food-energy unit preferred where the metric system is standard.
Current use
Kilojoules are used on nutrition labels outside the United States and throughout physics and engineering.
Source: NIST SP 811, Appendix B; ISO 80000-5 (energy)
Kilocalorie (kcal)
1 kcal = 4.184 kJDefinition. One thousand thermochemical calories (4184 J) — the "Calorie" on food labels
History and origin
The kilocalorie is one thousand calories, where the calorie was defined as the heat needed to warm one gram of water by one degree Celsius. On food labels the capitalised Calorie is really a kilocalorie.
Current use
Kilocalories, shown as Calories, measure food energy on US and many other nutrition labels.
Source: NIST SP 811, Appendix B; ISO 80000-5 (energy)
Where people use this
Kilojoules: nutrition labels outside the US, physics. Kilocalories: nutrition and diet, food labels. An 8400 kJ daily intake is about 2008 kcal.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, Appendix B; ISO 80000-5 (energy).
Questions people ask
How many kcal is 8400 kJ?
An 8400 kJ daily intake is about 2008 kcal. To convert kJ to kcal, divide by 4.184.
How many Calories in a kJ?
One kilojoule is about 0.239 food Calories (kcal).
How many kcal is 1000 kJ?
1000 kJ is about 239 kcal.
How do you convert kJ to Calories?
Divide the kilojoules by 4.184 to get food Calories, so a 500 kJ snack is about 120 kcal.