Convert Kilojoules to Joules

Q: How many joules are in a kilojoule?

There are 1,000 joules in one kilojoule.

Q: How many kilojoules are in a joule?

There are 0.001 kilojoules in one joule.

1 kilojoule = 1,000 joules. Type any value below to convert in either direction — the calculation happens in your browser.

kilojoules

joules

Kilojoules to Joules formula

Multiply the number of kilojoules by 1000 to get joules.

joules = kilojoules × 1000

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

kilojoules = joules ÷ 1000

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
15 kJ	15,000 J
20 kJ	20,000 J
25 kJ	25,000 J
30 kJ	30,000 J
40 kJ	40,000 J
50 kJ	50,000 J
75 kJ	75,000 J
100 kJ	100,000 J
250 kJ	250,000 J
500 kJ	500,000 J
1,000 kJ	1,000,000 J

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

About the kilojoule

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

About the joule

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

Frequently asked questions

How many joules are in a kilojoule?

There are 1,000 joules in one kilojoule.

How many kilojoules are in a joule?

There are 0.001 kilojoules in one joule.

Is this conversion exact?

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

What is 10 kilojoules in joules?

10 kilojoules equals 10,000 joules.

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