Quick Answer
1 calorie equals 4.184 joules. To convert calories to joules, multiply the value by this factor.
Key Facts
- Reverse: 1 joule = 0.239006 calories.
Calories to Joules Converter
Free instant cal → J converter. No signup, no uploads — everything is calculated privately in your browser.
1 cal = 4.184 joules
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Calories to Joules Formula
Formula: value × 4.184
Prefer to skip the math? Type any value in the converter above and it converts instantly.
Calories to Joules Conversion Table
| Calories (cal) | Joules (J) |
|---|---|
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 250 cal | 1,046 J |
| 500 cal | 2,092 J |
| 1,000 cal | 4,184 J |
Frequently Asked Questions
How do I convert calories to joules?
Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value × 4.184.
What is the exact calories to joules conversion factor?
1 calorie = 4.184 joules (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 joule = 0.239006 calories.
What are some common calories to joules conversions?
1 cal = 4.184 J; 10 cal = 41.84 J; 100 cal = 418.4 J. 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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