Convert kJ to joules
Enter the number of kilojoules that you want to convert to joules.
How to Convert Kilojoules to Joules
The kilojoule and joule are both units of energy. By definition, 1 kilojoule equals exactly 1000 joules. This means to convert kilojoules to joules, you multiply by 1000.
Formula
Step-by-Step Example
Convert 5 kJ to joules:
We need to convert kilojoules to joules
Since 1 kJ = 1000 J, multiply by 1000
5 × 1000 = 5000
5 kJ = 5000 J
Kilojoule to Joule Conversion Table
Quick reference table for common kilojoule to joule conversions. Click any value for detailed calculation.
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 0.1 kJ | 100 J |
| 0.5 kJ | 500 J |
| 1 kJ | 1000 J |
| 2 kJ | 2000 J |
| 5 kJ | 5000 J |
| 10 kJ | 10000 J |
| 25 kJ | 25000 J |
| 50 kJ | 50000 J |
| 100 kJ | 100000 J |
About These Units
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.
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 kilojoules to joules?
To convert kilojoules to joules, multiply the value by 1000. For example, 10 kJ = 10000 J.
How many joules are in 1 kilojoule?
1 kilojoule equals 1000 joules.
What is the formula for kilojoules to joules?
The formula is: J = kJ × 1000.