Convert joule to kilojoule
Please provide values below to convert joule [J] to kilojoule [kJ], or Convert kilojoule to joule.
1 J = 0.001 kJ. To convert joule to kilojoule, multiply the value by 0.001; to go the other way, divide by it (1 kJ = 1000 J). Both units measure energy and appear in everyday as well as technical calculations, so switching between them quickly is often useful.
Quick Reference
- 1 J = 0.001 kJ
- 1 kJ = 1000 J
- 10 J = 0.01 kJ
- 100 J = 0.1 kJ
How to Convert Joule to Kilojoule
1 J = 0.001 kJ
Example: convert 15 J to kJ:
15 J = 15 × 0.001 kJ = 0.015 kJ
Joule to Kilojoule Conversion Table
| joule | kilojoule |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 3 J | 0.003 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 |
| 1000 J | 1 kJ |
Joule
The joule (J) is the SI unit of energy, work, and heat, defined as the work done when a force of one newton acts over a distance of one meter.
History/Origin
The joule was named after James Prescott Joule in 1889 to honor his work in energy and thermodynamics. It was adopted as the SI unit of energy in 1948.
Current Use
The joule is widely used in physics, engineering, and everyday contexts to quantify energy, work, and heat in various applications, including electricity, mechanics, and thermodynamics.
Kilojoule
A kilojoule (kJ) is a unit of energy equal to 1,000 joules, used to quantify energy transfer or work done.
History/Origin
The kilojoule was introduced as part of the International System of Units (SI) to provide a convenient scale for measuring energy, especially in fields like nutrition and physics, replacing the joule for larger quantities.
Current Use
The kilojoule is widely used in nutrition to express food energy content, in physics and engineering to measure energy transfer, and in various scientific and industrial applications within the 'Energy' converter category.
Frequently Asked Questions
What is 1 joule in kilojoule?
1 joule (J) = 0.001 kilojoule (kJ).
How do you convert joule to kilojoule?
Multiply the joule value by 0.001. For example, 25 J × 0.001 = 0.025 kJ.
What is 10 joule in kilojoule?
10 J = 0.01 kJ.
Which unit is larger, the joule or the kilojoule?
The kilojoule is the larger unit: 1 J equals only 0.001 kJ.