Convert Kilocalories (kcal) to Kilojoules (kJ)
Convert kilocalories (kcal) to kilojoules (kJ): 1 kcal = 4.184 kJ, so multiply by 4.184. The standard food-energy conversion.
Formula
1 kcal = 4.184 kJ
To convert kcal to kJ, multiply the value by 4.184.
Conversion Table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 0.01 kcal | 0.0418 kJ |
| 0.1 kcal | 0.4184 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1046 kJ |
| 500 kcal | 2092 kJ |
| 1000 kcal | 4184 kJ |
| 2500 kcal | 10460 kJ |
| 5000 kcal | 20920 kJ |
| 10000 kcal | 41840 kJ |
| 50000 kcal | 209200 kJ |
Common kcal to kJ Examples
- 1 kcal = 4.184 kJ
- 5 kcal = 20.92 kJ
- 10 kcal = 41.84 kJ
- 25 kcal = 104.6 kJ
- 50 kcal = 209.2 kJ
- 100 kcal = 418.4 kJ
- 500 kcal = 2092 kJ
- 1000 kcal = 4184 kJ
About kcal to kJ
One kilocalorie equals 4.184 kilojoules, so kcal × 4.184 = kJ — for example 250 kcal = 1,046 kJ.
Nutrition labels use both: many countries show kJ while kcal (often just called Calories) is common in the US and UK. A daily intake of about 2,000 kcal is roughly 8,368 kJ. The kilojoule is the SI-based unit of food energy.
Frequently Asked Questions
Can I convert kJ back to kcal?
Yes. Simply invert the ratio: divide the kJ value by 4.184 to get the equivalent in kcal.
How many decimal places should I keep when converting kcal to kJ?
For everyday use, 2 to 4 decimal places are enough. Scientific or engineering work may require 6 or more.
Why are there different units for Energy?
Different regions and industries developed their own Energy standards over time. International trade and science later required conversion tools to bridge them.
What is the difference between kcal and kJ?
Both measure Energy, but they belong to different unit systems or scales, which is why a conversion factor is needed between them.
What is the formula to convert kcal to kJ?
The formula is 1 kcal = 4.184 kJ. To convert any value, multiply the value by 4.184.
How much is 1 kcal in kJ?
1 kcal equals 4.184 kJ. This ratio applies to every conversion between the two units.