Joule to Kilojoule
Convert J to kJ instantly — free, no sign-up.
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About the Joule (J)
The Joule is the SI unit of energy, defined as the work done by one newton of force over one meter — a single joule is roughly the energy released dropping an apple one meter.
About the Kilojoule (kJ)
The Kilojoule is equal to 1,000 joules, the unit used on nutrition labels in most countries outside the US alongside (or instead of) Calories.
How to convert J to kJ
- Enter the value in J in the box above.
- The kJ equivalent updates instantly.
- Use the swap button to convert kJ back to J just as easily.