Convert Calorie to Kilojoule
Enter the number of calories that you want to convert to kilojoules.
How to Convert Calories to Kilojoules
The calorie and kilojoule are both units of energy. 1 kilojoule equals 239.00573614 calories. This means to convert calories to kilojoules, you divide by 239.00573614.
Formula
Step-by-Step Example
Convert 5 cal to kilojoules:
We need to convert calories to kilojoules
Since 1 kJ = 239.00573614 cal, divide by 239.00573614
5 ÷ 239.00573614 = 0.02092
5 cal = 0.02092 kJ
Calorie to Kilojoule Conversion Table
Quick reference table for common calorie to kilojoule conversions. Click any value for detailed calculation.
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 0.1 cal | 0.0004184 kJ |
| 0.5 cal | 0.002092 kJ |
| 1 cal | 0.004184 kJ |
| 2 cal | 0.008368 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 25 cal | 0.1046 kJ |
| 50 cal | 0.2092 kJ |
| 100 cal | 0.4184 kJ |
About These Units
Calorie (cal)
A small calorie (cal) is the energy needed to raise 1 gram of water by 1°C, equal to 4.184 joules. Small calories are used in chemistry and physics. Note: food "Calories" (with capital C) are actually kilocalories. One calorie equals 0.003968 BTU.
Kilojoule (kJ)
A kilojoule (kJ) equals 1,000 joules or approximately 239 calories. Kilojoules measure food energy on nutrition labels in Australia, Europe, and many countries. An average adult needs 8,400-10,000 kJ daily. One kJ equals approximately 0.239 kcal.
Frequently Asked Questions
How do I convert calories to kilojoules?
To convert calories to kilojoules, divide the value by 239.00573614. For example, 10 cal = 0.04184 kJ.
How many kilojoules are in 1 calorie?
1 calorie equals 0.004184 kilojoules.
What is the formula for calories to kilojoules?
The formula is: kJ = cal ÷ 239.00573614.