Skip to content
Engyna

Convert joules to kilojoules

Convert joules (J) to kilojoules (kJ). 1 J = 0.001 kJ, and 1 kJ = 1,000 J.

1 J = 0.001 kJ

Joules to kJ formula

kJ = J × 0.001

Multiply the number of joules by 0.001.

Example: To convert 1 J to kilojoules: 1 × 0.001 = 0.001 kJ.

Quick answers

What is 1 J in kilojoules?
1 J = 0.001 kJ
What is 1,000 J in kilojoules?
1,000 J = 1 kJ

Joules to kJ conversion table

kJ to Joules table
joules (J)kilojoules (kJ)
1 J0.001 kJ
10 J0.01 kJ
100 J0.1 kJ
1,000 J1 kJ
4,184 J4.184 kJ
10,000 J10 kJ
100,000 J100 kJ
1,000,000 J1,000 kJ
3,600,000 J3,600 kJ

Frequently asked questions

How many joules are in a kilojoule?

There are 1,000 joules in a kilojoule (1 kJ = 1,000 J), so 1 J = 0.001 kJ.

How do I convert joules to kilojoules?

Multiply the number of joules by 0.001. To convert 1 J to kilojoules: 1 × 0.001 = 0.001 kJ.

Is the Joules to kJ conversion exact?

Yes. Both units are defined exactly, so 1 joule is exactly 0.001 kilojoules. Results on this page are rounded to six significant digits; pick more decimals in the converter if you need them.

What is 1 J in kilojoules?

1 J = 0.001 kJ.

How do I convert kilojoules back to joules?

Use the reverse relationship: 1 kJ = 1,000 J. The kJ to Joules page has a converter and a full table.

More energy conversions

All unit conversions