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Joule to Kilojoule
Convert Joule to Kilojoule and get the exact value instantly.
About this conversion
To convert Joule to Kilojoule, multiply the number of Joule by 0.001.
Energy shows up as joules, calories, kilowatt-hours or BTU depending on the field (nutrition, an electricity bill, heating or physics), so a conversion makes the numbers comparable.
Conversion table
| Joule (J) | Kilojoule (kJ) |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 5 J | 0.005 kJ |
| 10 J | 0.01 kJ |
| 100 J | 0.1 kJ |
How to use this converter
- Enter your Joule value
Type any number into the Joule field. It starts at 1 so you can read the rate straight away.
- Read the Kilojoule result
The amount in Kilojoule updates as you type, so there is no button to press and nothing to wait for.
- Swap or keep exploring
Use the swap control to flip the direction, or pick a related conversion from the list below.
Frequently asked
- How many Kilojoule are in one Joule?
- One Joule equals 0.001 kJ. Enter any amount above to get an exact figure for your own value.
- Is this converter accurate?
- Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
- Do you upload the numbers I enter?
- No. The Joule to Kilojoule conversion runs entirely in your browser tab, and nothing you type is sent to a server.
- Does it work on my phone?
- Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.
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