Convert calories to joules quickly and accurately using this free online converter
Used in nutrition labels, physics, and electricity consumption.
💡 Calories (kcal) are used in food; joules in science; kWh in electricity.
J = cal × 4.184
Example: 1 cal × 4.184 = 4.184 J
Use kcal for food; kWh for energy consumption; joules for science.
Common uses: nutrition, electricity bills, and scientific calculations.
How do I convert cal to J?
Multiply the value in Calories by 4.184. For example: 10 cal = 41.84 J.
When should I use Joules instead of Calories?
Use kcal for food; kWh for energy consumption; joules for science.
Is this converter accurate?
Yes. We use internationally recognized conversion factors, updated to current standards.
| Calories (cal) | Joules (J) |
|---|---|
| 1 cal | 4.184 J |
| 10 cal | 41.84 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 250 cal | 1046 J |
| 500 cal | 2092 J |
| 1000 cal | 4184 J |
| 2000 cal | 8368 J |