Convert Calorie to Joule
Use this free converter to change calories (cal) into joules (J). Calorie and joule both measure energy. As a quick reference, 1 cal equals 4.184 J, and 1 J equals 0.23900574 cal.
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Joule (J)
4.184
1 cal = 4.184 J
Energy conversion table
| Calorie | Joule |
|---|---|
| 0.01 | 0.04184 |
| 0.1 | 0.4184 |
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 1,000 | 4184 |
How to convert Calorie to Joule
Multiply the calorie value by 4.184 to get joules.
- Enter the number of calories you want to convert.
- The converter instantly shows the equivalent value in joules.
- Worked example: 15 cal × 4.184 = 62.76 J.
- Use the swap button to reverse the conversion (joule to calorie).
About these units
Calorie (cal)
- Definition
- A calorie (cal) is the energy needed to raise one gram of water by one degree Celsius, about 4.184 joules.
- History
- Defined in the 19th century, the small calorie was later joined by the larger food Calorie.
- Current use
- Calories appear in chemistry and, as kilocalories, in nutrition.
Joule (J)
- Definition
- The joule (J) is the SI unit of energy, the work done by a force of one newton over one meter.
- History
- Named after physicist James Prescott Joule, who studied the link between heat and work.
- Current use
- Joules measure energy, work, and heat throughout science and engineering.
Frequently asked questions
How many joules are in a calorie?
There are 4.184 J in 1 cal. To convert, multiply the number of calories by 4.184.
How do I convert calories to joules?
Multiply the calorie value by 4.184 to get joules. For example, 10 cal = 41.84 J.
Is this calorie-to-joule converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Calorie to other energy units
| Unit | 1 Calorie equals |
|---|---|
| Joule (J) | 4.184 J |
| Kilojoule (kJ) | 0.004184 kJ |
| Kilocalorie (kcal) | 0.001 kcal |
| Watt Hour (Wh) | 0.0011622222 Wh |
| Kilowatt Hour (kWh) | 0.0000011622222 kWh |
| Electronvolt (eV) | 2.6114e+19 eV |
| British Thermal Unit (BTU) | 0.0039656668 BTU |
| Foot-Pound (ft·lb) | 3.08596 ft·lb |