Kilocalorie to Kilojoule Converter
Quick answer
To convert Kilocalories to Kilojoules, multiply by 4.184 (or divide by 0.2390057361). Therefore, 1 Kilocalorie (kcal) equals 4.184 Kilojoules (kJ).
Formula: kJ = kcal × 4.184. Worked example: 10 kcal = 41.84 kJ.
Convert Kilocalorie (kcal) to Kilojoule (kJ) online with our free unit converter. In energy, 1 kcal = 4.184 kJ. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Kilocalorie to Kilojoule
- Step 1 — start with the formula. kJ = kcal × 4.184
- Step 2 — substitute your figure. 10 kcal × 4.184
- Step 3 — read the result. 10 kcal = 41.84 kJ
- Step 4 — check it in reverse. kcal = kJ × 0.2390057361 returns 10 kcal, which matches the figure you started with.
Energy Converter
27 units available
1 kcal = 4.184 kJ
Formula:
kJ = kcal × 4.184With your value: 1 kcal = 4.184 kJ
How big is that?
Everyday references on a logarithmic scale, all expressed in kilocalorie so you can sanity-check the result.
Other Kilocalorie to Kilojoule conversions
Kilocalorie to Kilojoule Conversion Table
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1000 | 4,184 |
Kilojoule to Kilocalorie Conversion Table
| Kilojoule (kJ) | Kilocalorie (kcal) |
|---|---|
| 0.5 | 0.119503 |
| 1 | 0.239006 |
| 2 | 0.478011 |
| 5 | 1.195029 |
| 10 | 2.390057 |
| 15 | 3.585086 |
| 20 | 4.780115 |
| 25 | 5.975143 |
| 50 | 11.950287 |
| 100 | 23.900574 |
| 250 | 59.751434 |
| 500 | 119.502868 |
| 1000 | 239.005736 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Kilocalorie (kcal)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Kilojoule (kJ)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Kilocalorie to Kilojoule
To convert from Kilocalorie (kcal) to Kilojoule (kJ), multiply the value by 4.184.
Formula: kJ = kcal × 4.184
Reverse: kcal = kJ × 0.2390057361
Step-by-Step Example
- Start with your value in Kilocalorie. For example: 5 kcal
- Multiply by the conversion factor: 5 x 4.184
- The result is: 20.92 kJ
Kilocalorie and Kilojoule Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Kilocalorie equals approximately 4.184 Kilojoules, the Kilocalorie represents a larger unit interval than the Kilojoule. Understanding the relationship between Kilocalorie and Kilojoule is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Kilocalorie
The kilocalorie (food Calorie) equals 1,000 calories or 4,184 joules. It is the standard unit for food energy content.
Common uses of Kilocalorie: nutrition, diet, food labeling.
About Kilojoule
The Kilojoule (symbol: kJ) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Kilojoule: energy calculations, engineering and science, education.
Frequently Asked Questions
- How many Kilojoules are in 1 Kilocalorie?
- There are exactly 4.184 Kilojoules in 1 Kilocalorie. This means the conversion factor from Kilocalorie to Kilojoule is 4.184.
- What is the formula to convert Kilocalorie to Kilojoule?
- The formula to convert Kilocalorie to Kilojoule is: kJ = kcal × 4.184. For example, to convert 10 Kilocalories to Kilojoules, you would multiply 10 by 4.184.
- What is a Kilocalorie?
- The kilocalorie (food Calorie) equals 1,000 calories or 4,184 joules. It is the standard unit for food energy content.
- What is a Kilojoule?
- The Kilojoule (symbol: kJ) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.
- What are the common uses of Kilocalorie?
- The Kilocalorie is commonly used in nutrition, diet, food labeling.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Kilocalorie to Kilojoule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/kilocalorie-to-kilojoule