Calories to Joules Converter
Convert calories to joules. Free calorie to joule energy converter for physics and nutrition science.Updated 2026-03-15
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Formula: J = cal × 4.184
Common Calories to Joules Conversions
| Calories (cal) | Joules (J) |
|---|---|
| 1 cal | 4.184 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 20 cal | 83.68 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 200 cal | 836.8 J |
| 500 cal | 2092 J |
| 1000 cal | 4184 J |
| 2000 cal | 8368 J |
| 2500 cal | 10460 J |
| 3000 cal | 12552 J |
| 5000 cal | 20920 J |
| 10000 cal | 41840 J |
How to Convert Calories to Joules
To convert calories to joules, use the formula: J = cal × 4.184
For example, to convert 20 cal to J: 20 cal = 83.68 J
💡 This calculator does the conversion instantly as you type. All calculations happen locally in your browser — no data is sent anywhere.
Frequently Asked Questions
How many joules in a calorie?
1 calorie (small calorie) = 4.184 joules. 1 food Calorie (kilocalorie) = 4184 joules.
What is the difference between a calorie and a Calorie?
A small calorie (cal) = 4.184 J. A food Calorie (Cal or kcal) = 1000 small calories = 4184 J.
Cite this tool:
"Calories to Joules Converter." ConvKit, conv-kit.com, https://conv-kit.com/tools/calories-to-joules/. Accessed 2026-03-15.