Calorie to Kilojoule Converter
Convert calorie to kilojoule instantly.
Standard energy units
joule 418.4
kilojoule 0.4184
kilocalorie 0.1
watt-hour 0.1162
kilowatt-hour 0.0001
BTU 0.3966
Fun comparisons
apples eaten 🍎~ Less than 0.01
hours of 100W bulb 💡~ Less than 0.01
marathons run 🏃~ Less than 0.01
full car tanks of fuel ⛽~ Less than 0.01
How to convert calorie to kilojoule
Enter your energy value in calorie and see the result in kilojoule instantly. Key reference points: 1 food Calorie equals 1 kcal (4.184 kJ), and 1 kilowatt-hour equals 3600 kJ (860 kcal).
Calorie is the small energy unit used in chemistry; kilojoule is the metric unit used on food labels in many countries. One calorie equals 0.004184 kilojoules.
Need the opposite direction? Convert kilojoule to calorie just as easily, or explore all our energy conversions.
Common calorie to kilojoule conversions
| Calorie (cal) | Kilojoule (kJ) |
|---|---|
| 1 | 0.004184 |
| 5 | 0.02092 |
| 10 | 0.04184 |
| 25 | 0.1046 |
| 50 | 0.2092 |
| 100 | 0.4184 |
| 500 | 2.092 |
| 1000 | 4.184 |
Frequently asked questions
1 calorie equals 0.004184 kilojoule.
Multiply by 0.004184. For example, 5 cal = 0.02092 kJ.
1000 calories equals 4.184 kilojoules.
1 kilojoule equals 239.006 calorie.
100 calorie equals 0.4184 kilojoule.