Joules to Kilojoules Conversion (J to kJ)

Joules to Kilojoules Converter

Enter the energy in joules below to get the value converted to kilojoules.

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Result in Kilojoules:

1 J = 0.001 kJ

How to Convert Joules to Kilojoules

To convert a measurement in joules to a measurement in kilojoules, divide the energy by the following conversion ratio: 1,000 joules/kilojoule.

Since one kilojoule is equal to 1,000 joules, you can use this simple formula to convert:

kilojoules = joules ÷ 1,000

The energy in kilojoules is equal to the energy in joules divided by 1,000.

For example, here's how to convert 5,000 joules to kilojoules using the formula above.

kilojoules = (5,000 J ÷ 1,000) = 5 kJ

Joules and kilojoules are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Joule?

The joule is the energy equal to the force on an object of one newton at a distance of one meter.^[1] One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.

Learn more about joules.

What Is a Kilojoule?

One kilojoule is equal to 1,000 joules, which is the energy equal to the force on an object of one newton at a distance of one meter.

The kilojoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "kilo" is the prefix for thousands, or 10³. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.

Learn more about kilojoules.

Joule to Kilojoule Conversion Table

Table showing various joule measurements converted to kilojoules.
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
20 J	0.02 kJ
30 J	0.03 kJ
40 J	0.04 kJ
50 J	0.05 kJ
60 J	0.06 kJ
70 J	0.07 kJ
80 J	0.08 kJ
90 J	0.09 kJ
100 J	0.1 kJ
200 J	0.2 kJ
300 J	0.3 kJ
400 J	0.4 kJ
500 J	0.5 kJ
600 J	0.6 kJ
700 J	0.7 kJ
800 J	0.8 kJ
900 J	0.9 kJ
1,000 J	1 kJ

Table showing various joule measurements converted to kilojoules.

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

20 J

0.02 kJ

30 J

0.03 kJ

40 J

0.04 kJ

50 J

0.05 kJ

60 J

0.06 kJ

70 J

0.07 kJ

80 J

0.08 kJ

90 J

0.09 kJ

100 J

0.1 kJ

200 J

0.2 kJ

300 J

0.3 kJ

400 J

0.4 kJ

500 J

0.5 kJ

600 J

0.6 kJ

700 J

0.7 kJ

800 J

0.8 kJ

900 J

0.9 kJ

1,000 J

1 kJ

References

International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf