Calories to Kilojoules Converter
How to convert calories to kilojoules
kilojoules = calories ÷ 239.005736
To convert calories to kilojoules, divide the number of calories by 239.005736.
1 cal = 0.004184 kJ
Examples
- One kilocalorie, or one food Calorie: 1,000 cal ÷ 239.005736 = 4.184 kJ
- 500 cal ÷ 239.005736 = 2.092 kJ
Good to know
This is the thermochemical calorie, exactly 4.184 J. It is the small calorie: the "Calories" on food labels are kilocalories, 1000 times larger. The International Table calorie (4.1868 J) is slightly different.
Calories to kilojoules conversion table
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 1 cal | 0.004184 kJ |
| 2 cal | 0.008368 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 20 cal | 0.08368 kJ |
| 50 cal | 0.2092 kJ |
| 100 cal | 0.4184 kJ |
| 200 cal | 0.8368 kJ |
| 250 cal | 1.046 kJ |
| 500 cal | 2.092 kJ |
| 1,000 cal | 4.184 kJ |
| 2,000 cal | 8.368 kJ |
| 2,500 cal | 10.46 kJ |
| 5,000 cal | 20.92 kJ |
| 10,000 cal | 41.84 kJ |
Unit definitions
- Calorie (cal)
- The thermochemical calorie is defined as exactly 4.184 joules, roughly the energy needed to heat one gram of water by one degree Celsius.
- Kilojoule (kJ)
- A kilojoule is 1000 joules. It is the unit for food energy on nutrition labels in Australia, New Zealand and, alongside kilocalories, the European Union.