The kilojoule
The kilojoule (kJ) equals exactly 1,000 joules. It is the standard unit on EU and many non-US nutrition labels — 1 dietary calorie ≈ 4.184 kJ. It also appears in industrial-process specifications and energy-storage ratings.
Kilojoules to Kilocalories Converter
1 kJ = 0.239006 kcal
1 kilojoule equals 0.239006 kilocalories. To convert kilojoules to kilocalories, multiply the kilojoule value by 0.239006. For quick reference: 1 kJ = 0.239006 kcal, 5 kJ = 1.19503 kcal, 10 kJ = 2.39006 kcal, 100 kJ = 23.9006 kcal.
Formula
Kilocalories = Kilojoules × 0.239006Quick
How to convert kilojoules to kilocalories
Take your value
Start with your value in kilojoules.
Multiply by 0.239006
Multiply the kilojoule value by 0.239006. This is the exact conversion factor from kilojoules to kilocalories.
Read the result
The product is your value in kilocalories. For example, 5 kJ × 0.239006 = 1.19503 kcal.
Conversion formula
The exact factor from kilojoules to kilocalories is 0.239006.
Kilocalories = Kilojoules × 0.239006
Kilojoules to Kilocalories conversion table
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Kilojoules (kJ) | Kilocalories (kcal) |
|---|---|
| 0.001 kJ | 0.00023901 kcal |
| 0.01 kJ | 0.0023901 kcal |
| 0.1 kJ | 0.023901 kcal |
| 0.5 kJ | 0.1195 kcal |
| 1 kJ | 0.23901 kcal |
| 1.5 kJ | 0.35851 kcal |
| 2 kJ | 0.47801 kcal |
| 5 kJ | 1.195 kcal |
| 10 kJ | 2.3901 kcal |
| 20 kJ | 4.7801 kcal |
| 50 kJ | 11.95 kcal |
| 100 kJ | 23.901 kcal |
| 200 kJ | 47.801 kcal |
| 250 kJ | 59.751 kcal |
| 500 kJ | 119.5 kcal |
| 1000 kJ | 239.01 kcal |
| 2000 kJ | 478.01 kcal |
| 2500 kJ | 597.51 kcal |
| 3600 kJ | 860.42 kcal |
| 5000 kJ | 1195 kcal |
| 7500 kJ | 1792.5 kcal |
| 10000 kJ | 2390.1 kcal |
| 25000 kJ | 5975.1 kcal |
| 50000 kJ | 11950 kcal |
| 100000 kJ | 23901 kcal |
| 250000 kJ | 59751 kcal |
| 500000 kJ | 119503 kcal |
| 1000000 kJ | 239006 kcal |
| 2000000 kJ | 478011 kcal |
| 3600000 kJ | 860421 kcal |
| 5000000 kJ | 1195029 kcal |
| 10000000 kJ | 2390057 kcal |
| 25000000 kJ | 5975143 kcal |
| 50000000 kJ | 11950287 kcal |
| 100000000 kJ | 23900574 kcal |
| 250000000 kJ | 59751434 kcal |
| 500000000 kJ | 119502868 kcal |
| 1000000000 kJ | 239005736 kcal |
| 2000000000 kJ | 478011472 kcal |
| 5000000000 kJ | 1195028681 kcal |
| 10000000000 kJ | 2390057361 kcal |
| 20000000000 kJ | 4780114723 kcal |
| 50000000000 kJ | 11950286807 kcal |
| 100000000000 kJ | 23900573614 kcal |
| 1000000000000 kJ | 239005736138 kcal |
| 10000000000000 kJ | 2390057361377 kcal |
| 100000000000000 kJ | 23900573613767 kcal |
| 1000000000000000 kJ | 239005736137667 kcal |
| 10000000000000000 kJ | 2.3901 × 10^15 kcal |
| 100000000000000000 kJ | 2.3901 × 10^16 kcal |
Real-world reference
A medium banana provides about 450 kJ of food energy. A laptop battery typically stores 200–300 kJ. In kilocalories, that gives you: 1 kJ = 0.239006 kcal, 10 kJ = 2.39006 kcal, 100 kJ = 23.9006 kcal.
Frequently asked questions
- How many kilocalories are in 1 kilojoule?
- 1 kilojoule equals 0.239006 kilocalories.
- How do I convert kilojoules to kilocalories?
- Multiply the kilojoule value by 0.239006. So x kJ × 0.239006 = the equivalent in kcal.
- What is 5 kilojoules in kilocalories?
- 5 kilojoules equals 1.19503 kilocalories.
- What is 10 kilojoules in kilocalories?
- 10 kilojoules equals 2.39006 kilocalories.
- What is 100 kilojoules in kilocalories?
- 100 kilojoules equals 23.9006 kilocalories.
- How do I convert back from kilocalories to kilojoules?
- Multiply the kilocalorie value by 4.184. For example, 1 kcal = 4.184 kJ.
- Is the kilojoule bigger than the kilocalorie?
- No. 1 kilojoule is smaller than 1 kilocalorie. It takes 4.184 kilojoules to equal 1 kilocalorie.
- Are these conversion factors exact?
- Yes. The factor of 0.239006 is derived directly from the SI definitions of kilojoule and kilocalorie.
About the kilojoule and the kilocalorie
The kilocalorie
The kilocalorie (kcal) equals exactly 4,184 joules — 1,000 small calories. This is the 'Calorie' (capital C) printed on US nutrition labels: when a food package says '250 Calories', it means 250 kcal. Outside the US, food energy is usually labeled in kJ as well.