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Convert kilojoules to joules

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

100 kJ = 100,000 J

kJ to Joules formula

J = kJ × 1,000

Multiply the number of kilojoules by 1,000.

Example: To convert 100 kJ to joules: 100 × 1,000 = 100,000 J.

Quick answers

What is 100 kJ in joules?
100 kJ = 100,000 J
What is 1,000 kJ in joules?
1,000 kJ = 1,000,000 J
What is 8,700 kJ in joules?
8,700 kJ = 8,700,000 J

kJ to Joules conversion table

Joules to kJ table
kilojoules (kJ)joules (J)
1 kJ1,000 J
10 kJ10,000 J
50 kJ50,000 J
100 kJ100,000 J
250 kJ250,000 J
418.4 kJ418,400 J
500 kJ500,000 J
1,000 kJ1,000,000 J
2,000 kJ2,000,000 J
4,184 kJ4,184,000 J
8,700 kJ8,700,000 J
10,000 kJ10,000,000 J

Frequently asked questions

How many joules are in a kilojoule?

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

How do I convert kilojoules to joules?

Multiply the number of kilojoules by 1,000. To convert 100 kJ to joules: 100 × 1,000 = 100,000 J.

Is the kJ to Joules conversion exact?

Yes. Both units are defined exactly, so 1 kilojoule is exactly 1,000 joules. Results on this page are rounded to six significant digits; pick more decimals in the converter if you need them.

What is 100 kJ in joules?

100 kJ = 100,000 J.

How do I convert joules back to kilojoules?

Use the reverse relationship: 1 J = 0.001 kJ. The Joules to kJ page has a converter and a full table.

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