Convert Joule to Kilocalorie
Convert joules to kilocalories by entering a value below.
How to Convert Joules to Kilocalories
The joule and kilocalorie are both units of energy. By definition, 1 kilocalorie equals exactly 4184 joules. This means to convert joules to kilocalories, you divide by 4184.
Formula
Step-by-Step Example
Convert 5 J to kilocalories:
We need to convert joules to kilocalories
Since 1 kcal = 4184 J, divide by 4184
5 ÷ 4184 = 0.0011950287
5 J = 0.0011950287 kcal
Joule to Kilocalorie Conversion Table
Quick reference table for common joule to kilocalorie conversions. Click any value for detailed calculation.
| Joules (J) | Kilocalories (kcal) |
|---|---|
| 0.1 J | 2.3900573614e-5 kcal |
| 0.5 J | 0.0001195029 kcal |
| 1 J | 0.0002390057 kcal |
| 2 J | 0.0004780115 kcal |
| 5 J | 0.0011950287 kcal |
| 10 J | 0.0023900574 kcal |
| 25 J | 0.0059751434 kcal |
| 50 J | 0.0119502868 kcal |
| 100 J | 0.0239005736 kcal |
About These Units
Joule (J)
The joule (J) is the SI unit of energy equal to one watt-second or one newton-meter. Joules measure work, heat, and electrical energy. One joule equals approximately 0.239 calories. Lifting a 100g apple one meter requires about 1 joule. Named after physicist James Prescott Joule.
Kilocalorie (kcal)
A kilocalorie (kcal), often written as "Calorie" (capital C) on food labels, equals 1,000 small calories or 4,184 joules. Kilocalories measure food energy. Average adult needs 2,000-2,500 kcal daily. Walking one mile burns about 80-100 kcal.
Frequently Asked Questions
How do I convert joules to kilocalories?
To convert joules to kilocalories, divide the value by 4184. For example, 10 J = 0.0023900574 kcal.
How many kilocalories are in 1 joule?
1 joule equals 0.0002390057 kilocalories.
What is the formula for joules to kilocalories?
The formula is: kcal = J ÷ 4184.