Convert Kilocalorie to Joule
Input the number of kilocalories you want to convert to joules.
How to Convert Kilocalories to Joules
The kilocalorie and joule are both units of energy. By definition, 1 kilocalorie equals exactly 4184 joules. This means to convert kilocalories to joules, you multiply by 4184.
Formula
Step-by-Step Example
Convert 5 kcal to joules:
We need to convert kilocalories to joules
Since 1 kcal = 4184 J, multiply by 4184
5 × 4184 = 20920
5 kcal = 20920 J
Kilocalorie to Joule Conversion Table
Quick reference table for common kilocalorie to joule conversions. Click any value for detailed calculation.
| Kilocalories (kcal) | Joules (J) |
|---|---|
| 0.1 kcal | 418.4 J |
| 0.5 kcal | 2092 J |
| 1 kcal | 4184 J |
| 2 kcal | 8368 J |
| 5 kcal | 20920 J |
| 10 kcal | 41840 J |
| 25 kcal | 104600 J |
| 50 kcal | 209200 J |
| 100 kcal | 418400 J |
About These Units
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.
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.
Frequently Asked Questions
How do I convert kilocalories to joules?
To convert kilocalories to joules, multiply the value by 4184. For example, 10 kcal = 41840 J.
How many joules are in 1 kilocalorie?
1 kilocalorie equals 4184 joules.
What is the formula for kilocalories to joules?
The formula is: J = kcal × 4184.