Battery Equivalents and Replacements

Kilojoules (kJ) to Joules (J) Conversion Calculator and Table

Kilojoules and joules are units of energy, and their conversions are simple and straightforward - one just has to remember that "k" stands for "kilo," which is, according to the SI prefixes table, 103 (one thousand) of the main value.

Published: January 5, 2024.

To convert kilojoules to joules, write the value in kilojoules and click 'Calculate':

Kilojoules (kJ) to Joules (J)

Kilojoules (kJ):

Joules (J):

To convert Joules to kilojoules, check our Joules (J) to Kilojoules (kJ) Conversion Calculator and Table article.

How To Convert Kilojoules (kJ) to Joules (J)

"k" stands for "kilo" and means "one thousand."  Thus, one kilojoule equals 1000 joules:

1kJ = 1000J

For example, if You want to convert 15.34 kJ to Joules, You can write:

E(kJ) = 15.34 kJ = 15.34 * 1000J = 15340J

Kilojoules (kJ) to Joules (J) Conversion Table

The following chart contains the most common Kilojoules (kJ) values converted to Joules (J):

Kilojoules (kJ) Joules (J)
0.01 10
0.1 100
0.25 250
0.5 500
1 1000
2 2000
3 3000
5 5000
10 10000
50 50000
100 100000


If You wish to convert values that are not in the table, please use the kilojoules to Joules conversion calculator.

How much is 1kJ or 1000J of energy?

To get the feeling of how much 1kJ or 1000J of energy is, here is an example of a 1000W heater:

If you have a 1000W heater, that heater releases 1000J or 1kJ of energy every second. And to power such a heater, you would need:

  • @12V: 1000W / 12V = 83.3A
  • @120V: 1000W / 120V = 8.33A
  • @220V: 1000W / 220V = 4.54A

These values are calculated using Ohm's Law.