Quick Answer
1 calorie equals 0.004184 kilojoules. To convert calories to kilojoules, multiply the value by this factor.
Key Facts
- Reverse: 1 kilojoule = 239.006 calories.
Calories to Kilojoules Converter
Free instant cal → kJ converter. No signup, no uploads — everything is calculated privately in your browser.
1 cal = 0.004184 kilojoules
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Calories to Kilojoules Formula
Formula: value ÷ 239.006
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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 |
| 25 cal | 0.1046 kJ |
| 50 cal | 0.2092 kJ |
| 100 cal | 0.4184 kJ |
| 250 cal | 1.046 kJ |
| 500 cal | 2.092 kJ |
| 1,000 cal | 4.184 kJ |
Frequently Asked Questions
How do I convert calories to kilojoules?
Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value ÷ 239.006.
What is the exact calories to kilojoules conversion factor?
1 calorie = 0.004184 kilojoules (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 kilojoule = 239.006 calories.
What are some common calories to kilojoules conversions?
1 cal = 0.004184 kJ; 10 cal = 0.04184 kJ; 100 cal = 0.4184 kJ. Use the full conversion table below for more reference values.
Is a calorie the same as a food Calorie?
No — and the capital letter matters. A food Calorie (with a capital C) is a kilocalorie: 1,000 small calories. This converter treats them correctly: 1 kcal = 4.184 kJ = 1,000 cal. Energy labels on food almost always mean kilocalories, even where the label just says "calories".
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