Convert Joule to Kilocalorie
Use this free converter to change joules (J) into kilocalories (kcal). Joule and kilocalorie both measure energy. As a quick reference, 1 J equals 0.00023900574 kcal, and 1 kcal equals 4184 J.
Free · runs in your browser · no sign-up
Kilocalorie (kcal)
0.00023900574
1 J = 0.00023900574 kcal
Energy conversion table
| Joule | Kilocalorie |
|---|---|
| 0.01 | 0.0000023900574 |
| 0.1 | 0.000023900574 |
| 0.5 | 0.00011950287 |
| 1 | 0.00023900574 |
| 2 | 0.00047801147 |
| 3 | 0.00071701721 |
| 5 | 0.0011950287 |
| 10 | 0.0023900574 |
| 20 | 0.0047801147 |
| 25 | 0.0059751434 |
| 50 | 0.011950287 |
| 100 | 0.023900574 |
| 1,000 | 0.23900574 |
How to convert Joule to Kilocalorie
Multiply the joule value by 0.00023900574 to get kilocalories.
- Enter the number of joules you want to convert.
- The converter instantly shows the equivalent value in kilocalories.
- Worked example: 15 J × 0.00023900574 = 0.003585086 kcal.
- Use the swap button to reverse the conversion (kilocalorie 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.
Kilocalorie (kcal)
- Definition
- A kilocalorie (kcal) is 1,000 small calories — the "Calorie" used on food labels.
- History
- It was adopted by nutritionists as a practical measure of food energy.
- Current use
- Kilocalories (food Calories) measure the energy content of food and diets.
Frequently asked questions
How many kilocalories are in a joule?
There are 0.00023900574 kcal in 1 J. To convert, multiply the number of joules by 0.00023900574.
How do I convert joules to kilocalories?
Multiply the joule value by 0.00023900574 to get kilocalories. For example, 10 J = 0.0023900574 kcal.
Is this joule-to-kilocalorie 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 |