Convert Joules to Kilojoules

Q: How many kilojoules are in a joule?

There are 0.001 kilojoules in one joule.

Q: How many joules are in a kilojoule?

There are 1,000 joules in one kilojoule.

1 joule = 0.001 kilojoules. Type any value below to convert in either direction — the calculation happens in your browser.

joules

kilojoules

Joules to Kilojoules formula

Multiply the number of joules by 0.001 to get kilojoules.

kilojoules = joules × 0.001

To go the other way: divide the number of kilojoules by 0.001, or multiply by 1000.

joules = kilojoules ÷ 0.001

Joules to Kilojoules conversion table

Joules	Kilojoules
1 J	0.001 kJ
2 J	0.002 kJ
3 J	0.003 kJ
4 J	0.004 kJ
5 J	0.005 kJ
6 J	0.006 kJ
7 J	0.007 kJ
8 J	0.008 kJ
9 J	0.009 kJ
10 J	0.01 kJ
15 J	0.015 kJ
20 J	0.02 kJ
25 J	0.025 kJ
30 J	0.03 kJ
40 J	0.04 kJ
50 J	0.05 kJ
75 J	0.075 kJ
100 J	0.1 kJ
250 J	0.25 kJ
500 J	0.5 kJ
1,000 J	1 kJ

Kilojoules to Joules conversion table

Kilojoules	Joules
1 kJ	1,000 J
2 kJ	2,000 J
3 kJ	3,000 J
4 kJ	4,000 J
5 kJ	5,000 J
6 kJ	6,000 J
7 kJ	7,000 J
8 kJ	8,000 J
9 kJ	9,000 J
10 kJ	10,000 J

About the joule

The joule is the SI unit of energy — the work done by one newton acting over one metre.

About the kilojoule

A kilojoule is 1,000 joules and is how food energy is labelled in most of the world.

Frequently asked questions

How many kilojoules are in a joule?

There are 0.001 kilojoules in one joule.

How many joules are in a kilojoule?

There are 1,000 joules in one kilojoule.

Is this conversion exact?

The ratio between the joule and the kilojoule is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.

What is 10 joules in kilojoules?

10 joules equals 0.01 kilojoules.

Related energy conversions

All energy converters · All converters