Convert Joule to Calorie
Use this free converter to change joules (J) into calories (cal). Joule and calorie both measure energy. As a quick reference, 1 J equals 0.23900574 cal, and 1 cal equals 4.184 J.
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Calorie (cal)
0.23900574
1 J = 0.23900574 cal
Energy conversion table
| Joule | Calorie |
|---|---|
| 0.01 | 0.0023900574 |
| 0.1 | 0.023900574 |
| 0.5 | 0.11950287 |
| 1 | 0.23900574 |
| 2 | 0.47801147 |
| 3 | 0.71701721 |
| 5 | 1.1950287 |
| 10 | 2.3900574 |
| 20 | 4.7801147 |
| 25 | 5.9751434 |
| 50 | 11.950287 |
| 100 | 23.900574 |
| 1,000 | 239.00574 |
How to convert Joule to Calorie
Multiply the joule value by 0.23900574 to get calories.
- Enter the number of joules you want to convert.
- The converter instantly shows the equivalent value in calories.
- Worked example: 15 J × 0.23900574 = 3.585086 cal.
- Use the swap button to reverse the conversion (calorie to joule).
About these units
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.
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.
Frequently asked questions
How many calories are in a joule?
There are 0.23900574 cal in 1 J. To convert, multiply the number of joules by 0.23900574.
How do I convert joules to calories?
Multiply the joule value by 0.23900574 to get calories. For example, 10 J = 2.3900574 cal.
Is this joule-to-calorie 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 Joule to other energy units
| Unit | 1 Joule equals |
|---|---|
| Kilojoule (kJ) | 0.001 kJ |
| Calorie (cal) | 0.23900574 cal |
| Kilocalorie (kcal) | 0.00023900574 kcal |
| Watt Hour (Wh) | 0.00027777778 Wh |
| Kilowatt Hour (kWh) | 2.7778e-7 kWh |
| Electronvolt (eV) | 6.2415e+18 eV |
| British Thermal Unit (BTU) | 0.00094781712 BTU |
| Foot-Pound (ft·lb) | 0.73756215 ft·lb |