Kilocalorie to Joule Converter
Convert Kilocalorie (kcal) to Joule (J) instantly. 1 kcal = 4,184 J.
Energy Converter
27 units available
1 kcal = 4,184 J
Formula:
J = kcal × 4,184With your value: 1 kcal = 4,184 J
How big is that?
Everyday references on a logarithmic scale, all expressed in kilocalorie so you can sanity-check the result.
Other Kilocalorie to Joule conversions
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 |
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 |
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
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
How to Convert Kilocalorie to Joule
To convert from Kilocalorie (kcal) to Joule (J), multiply the value by 4,184.
Formula: J = kcal × 4,184
Reverse: kcal = J × 0.0002390057
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: 20,920 J
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.
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.
Frequently Asked Questions
How many Joule are in 1 Kilocalorie?
There are exactly 4,184 Joule in 1 Kilocalorie. This means the conversion factor from Kilocalorie to Joule is 4,184.
What is the formula to convert Kilocalorie to Joule?
The formula to convert Kilocalorie to Joule is: J = kcal × 4,184. For example, to convert 10 Kilocalorie to Joule, 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 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 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 Joule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/kilocalorie-to-joule