Convert kcal to kJ
Convert kilocalories to kilojoules by entering a value below.
How to Convert Kilocalories to Kilojoules
The kilocalorie and kilojoule are both units of energy. 1 kilocalorie equals 4.184 kilojoules. This means to convert kilocalories to kilojoules, you multiply by 4.184.
Formula
Step-by-Step Example
Convert 5 kcal to kilojoules:
We need to convert kilocalories to kilojoules
Since 1 kcal = 4.184 kJ, multiply by 4.184
5 × 4.184 = 20.92
5 kcal = 20.92 kJ
Kilocalorie to Kilojoule Conversion Table
Quick reference table for common kilocalorie to kilojoule conversions. Click any value for detailed calculation.
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
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.
Kilojoule (kJ)
A kilojoule (kJ) equals 1,000 joules or approximately 239 calories. Kilojoules measure food energy on nutrition labels in Australia, Europe, and many countries. An average adult needs 8,400-10,000 kJ daily. One kJ equals approximately 0.239 kcal.
Frequently Asked Questions
How do I convert kilocalories to kilojoules?
To convert kilocalories to kilojoules, multiply the value by 4.184. For example, 10 kcal = 41.84 kJ.
How many kilojoules are in 1 kilocalorie?
1 kilocalorie equals 4.184 kilojoules.
What is the formula for kilocalories to kilojoules?
The formula is: kJ = kcal × 4.184.