ENERGY CONVERSION
Joule to Kilojoule.
Convert joule (J) to kilojoule (kJ), with the math explained.
THE MATH, MADE SIMPLE
How to convert joule to kilojoule
Multiply your joule value by 0.001 to get the equivalent in kilojoule. Both units are normalized through the joule.
kJ = J × 0.00110 J = 0.01 kJ
Result rounded to 12 significant digits. Change the precision in the calculator to suit your task.QUICK REFERENCE
J to kJ 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 |
| 20 J | 0.02 kJ |
| 50 J | 0.05 kJ |
| 100 J | 0.1 kJ |
| 500 J | 0.5 kJ |
| 1,000 J | 1 kJ |
About the joule
The joule (J) is a unit of energy. One joule equals 1 joule (base unit) in this calculator.
All joule conversionsAbout the kilojoule
The kilojoule (kJ) is a unit of energy. One kilojoule equals 1,000 joule (base unit) in this calculator.
All kilojoule conversionsCommon questions
What is 1 J in kJ?
One joule equals 0.001 kJ. Use the formula above for other values.
Why might another calculator show a different last digit?
Calculators may round at different stages or use different unit conventions. We keep full JavaScript numeric precision during calculation and round only for display. Choose up to 15 significant digits. Check US versus UK units and the notes for this category.
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