Convert Kilocalorie to Joule
Use this free converter to change kilocalories (kcal) into joules (J). Kilocalorie and joule both measure energy. As a quick reference, 1 kcal equals 4184 J, and 1 J equals 0.00023900574 kcal.
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Joule (J)
4184
1 kcal = 4184 J
Energy conversion table
| Kilocalorie | Joule |
|---|---|
| 0.01 | 41.84 |
| 0.1 | 418.4 |
| 0.5 | 2092 |
| 1 | 4184 |
| 2 | 8368 |
| 3 | 12552 |
| 5 | 20920 |
| 10 | 41840 |
| 20 | 83680 |
| 25 | 104600 |
| 50 | 209200 |
| 100 | 418400 |
| 1,000 | 4184000 |
How to convert Kilocalorie to Joule
Multiply the kilocalorie value by 4184 to get joules.
- Enter the number of kilocalories you want to convert.
- The converter instantly shows the equivalent value in joules.
- Worked example: 15 kcal × 4184 = 62760 J.
- Use the swap button to reverse the conversion (joule to kilocalorie).
About these units
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.
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 kilocalorie?
There are 4184 J in 1 kcal. To convert, multiply the number of kilocalories by 4184.
How do I convert kilocalories to joules?
Multiply the kilocalorie value by 4184 to get joules. For example, 10 kcal = 41840 J.
Is this kilocalorie-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 Kilocalorie to other energy units
| Unit | 1 Kilocalorie equals |
|---|---|
| Joule (J) | 4184 J |
| Kilojoule (kJ) | 4.184 kJ |
| Calorie (cal) | 1000 cal |
| Watt Hour (Wh) | 1.1622222 Wh |
| Kilowatt Hour (kWh) | 0.0011622222 kWh |
| Electronvolt (eV) | 2.6114e+22 eV |
| British Thermal Unit (BTU) | 3.9656668 BTU |
| Foot-Pound (ft·lb) | 3085.96 ft·lb |