Kilojoules to Joules converter (kJ to J)
Convert Kilojoules (kJ) to Joules (J) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert Kilojoules to Joules
1 kilojoule (kJ) is equal to 1000 joules (J).
E(J) = E(kJ) × 1000
Multiply the energy in kilojoules by 1000:
Example: Convert 5 kJ to joules:
E(J) = 5 × 1000 = 5000 J
What is a Kilojoules?
The Kilojoules (kJ) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Joules?
The Joules (J) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts energy from Kilojoules into Joules. One kJ equals 1000 J.
Kilojoules to Joules conversion table
Common kJ values and the matching J result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 0 kJ | 0 J |
| 1 kJ | 1000 J |
| 5 kJ | 5000 J |
| 10 kJ | 10000 J |
| 50 kJ | 50000 J |
| 100 kJ | 100000 J |
| 500 kJ | 500000 J |
| 1000 kJ | 1000000 J |
How this calculator works
The form on this page is a Kilojoules-to-Joules converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the J result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many J are in 1 kJ?
1 kJ = 1000 J.
How do I convert Kilojoules to Joules?
Multiply the energy in kilojoules by 1000:
Is this kJ to J converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.