Calories to Kilojoules Converter (cal to kJ)
Calories to Kilojoules Converter (cal to kJ)
Convert thermochemical small calories (cal) to metric kilojoules (kJ). Essential for thermal chemistry, specific heat capacity determinations, and scientific energy accounting.
How to use this converter
- Enter the value in Calories (cal) you want to convert.
- Ensure the “From” selector is set to Calories (cal).
- Ensure the “To” selector is set to Kilojoules (kJ).
- The converted value in Kilojoules (kJ) updates instantly in the result box.
Calories to Kilojoules Formula
To convert from calories to kilojoules, use the authoritative physical relationship:
Formula:
kJ = cal × 0.004184
Calculation Examples
- Example 1: 1 cal = 0.004184 kJ
- Example 2: 5 cal = 0.02092 kJ
- Example 3: 10 cal = 0.04184 kJ
- Example 4: 50 cal = 0.2092 kJ
Calories to Kilojoules Conversion Table
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 1 cal | 0.004184 kJ |
| 2 cal | 0.008368 kJ |
| 5 cal | 0.020920 kJ |
| 10 cal | 0.041840 kJ |
| 20 cal | 0.083680 kJ |
| 50 cal | 0.209200 kJ |
| 100 cal | 0.418400 kJ |
Frequently Asked Questions
How do I convert Calories to Kilojoules?
Input your number in calories into the calculator above, and your equivalent in kilojoules is displayed immediately according to the standard physical conversion formula.
What is the difference between small calories (cal) and food Calories (kcal)?
One food Calorie (often capitalized as Calorie or written as kcal) equals exactly 1,000 small thermal calories (cal), or 4.184 kilojoules (kJ). In everyday nutritional conversations and food nutrition facts tables, “calories” almost always refers to kilocalories (kcal).
Is this calculation accurate for engineering and scientific applications?
Yes. ConverterHub uses exact thermochemical and SI standard conversion constants (including 1 cal = 4.184 J and 1 kWh = 3,600,000 J) to ensure full precision across academic, domestic, and laboratory calculations.