Joule to Kilocalorie Converter
Convert Joule (J) to Kilocalorie (kcal) instantly. 1 J = 0.000239 kcal.
Energy Converter
27 units available
1 J = 0.000239 kcal
Formula:
kcal = J × 0.0002390057With your value: 1 J = 0.00023901 kcal
How big is that?
Everyday references on a logarithmic scale, all expressed in joule so you can sanity-check the result.
Other Joule to Kilocalorie conversions
Joule to Kilocalorie Conversion Table
| Joule (J) | Kilocalorie (kcal) |
|---|---|
| 0.5 | 0.00012 |
| 1 | 0.000239 |
| 2 | 0.000478 |
| 5 | 0.001195 |
| 10 | 0.00239 |
| 15 | 0.003585 |
| 20 | 0.00478 |
| 25 | 0.005975 |
| 50 | 0.01195 |
| 100 | 0.023901 |
| 250 | 0.059751 |
| 500 | 0.119503 |
| 1000 | 0.239006 |
Kilocalorie to Joule Conversion Table
| Kilocalorie (kcal) | Joule (J) |
|---|---|
| 0.5 | 2,092 |
| 1 | 4,184 |
| 2 | 8,368 |
| 5 | 20,920 |
| 10 | 41,840 |
| 15 | 62,760 |
| 20 | 83,680 |
| 25 | 104,600 |
| 50 | 209,200 |
| 100 | 418,400 |
| 250 | 1,046,000 |
| 500 | 2,092,000 |
| 1000 | 4,184,000 |
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.
Joule (J)
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
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
How to Convert Joule to Kilocalorie
To convert from Joule (J) to Kilocalorie (kcal), multiply the value by 0.0002390057.
Formula: kcal = J × 0.0002390057
Reverse: J = kcal × 4,184
Step-by-Step Example
- Start with your value in Joule. For example: 5 J
- Multiply by the conversion factor: 5 x 0.0002390057
- The result is: 0.001195 kcal
About Joule
The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
Common uses: physics, electrical engineering, chemistry.
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: nutrition, diet, food labeling.
Frequently Asked Questions
How many Kilocalorie are in 1 Joule?
There are exactly 0.0002390057 Kilocalorie in 1 Joule. This means the conversion factor from Joule to Kilocalorie is 0.0002390057.
What is the formula to convert Joule to Kilocalorie?
The formula to convert Joule to Kilocalorie is: kcal = J × 0.0002390057. For example, to convert 10 Joule to Kilocalorie, you would multiply 10 by 0.0002390057.
What is a Joule?
The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.
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 are the common uses of Joule?
The Joule is commonly used in physics, electrical engineering, chemistry.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Joule to Kilocalorie converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/joule-to-kilocalorie