Kilocalories to Kilojoules Converter (kcal to kJ)
Kilocalories to Kilojoules Converter (kcal to kJ)
Convert kilocalories (kcal / food Calories) to kilojoules (kJ) accurately. Ideal for athletes, dietitians, and food manufacturers translating North American calorie counts into international metric energy values.
How to use this converter
- Enter the value in Kilocalories (kcal) you want to convert.
- Ensure the “From” selector is set to Kilocalories (kcal).
- Ensure the “To” selector is set to Kilojoules (kJ).
- The converted value in Kilojoules (kJ) updates instantly in the result box.
Kilocalories to Kilojoules Formula
To convert from kilocalories to kilojoules, use the authoritative physical relationship:
Formula:
kJ = kcal × 4.184
Calculation Examples
- Example 1: 1 kcal = 4.184 kJ
- Example 2: 5 kcal = 20.92 kJ
- Example 3: 10 kcal = 41.84 kJ
- Example 4: 50 kcal = 209.2 kJ
Kilocalories to Kilojoules Conversion Table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.1840 kJ |
| 2 kcal | 8.3680 kJ |
| 5 kcal | 20.9200 kJ |
| 10 kcal | 41.8400 kJ |
| 20 kcal | 83.6800 kJ |
| 50 kcal | 209.20 kJ |
| 100 kcal | 418.40 kJ |
Frequently Asked Questions
How do I convert Kilocalories to Kilojoules?
Input your number in kilocalories 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.