Convert Kilocalorie to Kilojoule
Use this free converter to change kilocalories (kcal) into kilojoules (kJ). Kilocalorie and kilojoule both measure energy. As a quick reference, 1 kcal equals 4.184 kJ, and 1 kJ equals 0.23900574 kcal.
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Kilojoule (kJ)
4.184
1 kcal = 4.184 kJ
Energy conversion table
| Kilocalorie | Kilojoule |
|---|---|
| 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 Kilocalorie to Kilojoule
Multiply the kilocalorie value by 4.184 to get kilojoules.
- Enter the number of kilocalories you want to convert.
- The converter instantly shows the equivalent value in kilojoules.
- Worked example: 15 kcal × 4.184 = 62.76 kJ.
- Use the swap button to reverse the conversion (kilojoule 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.
Kilojoule (kJ)
- Definition
- A kilojoule (kJ) is 1,000 joules, a practical size for food energy and mechanical work.
- History
- It is a metric multiple of the joule.
- Current use
- Kilojoules express food energy on nutrition labels in many countries.
Frequently asked questions
How many kilojoules are in a kilocalorie?
There are 4.184 kJ in 1 kcal. To convert, multiply the number of kilocalories by 4.184.
How do I convert kilocalories to kilojoules?
Multiply the kilocalorie value by 4.184 to get kilojoules. For example, 10 kcal = 41.84 kJ.
Is this kilocalorie-to-kilojoule 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 |