Convert Joules (J) to Kilojoules (kJ)
Enter a value below to convert Joules (J) to Kilojoules (kJ).
Conversion:
1 Joules (J) = 0.001 Kilojoules (kJ)
How to Convert Joules (J) to Kilojoules (kJ)
1 j = 0.001 kj
1 kj = 1000 j
Example: convert 15 Joules (J) to Kilojoules (kJ):
25 j = 0.025 kj
Joules (J) to Kilojoules (kJ) Conversion Table
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 0.01 j | 0.00001 kj |
| 0.1 j | 0.0001 kj |
| 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 |
| 1000 j | 1 kj |
Joules (J)
Definition
A joule (J) is the SI unit of energy, defined as the work done when a force of one newton moves an object one meter in the direction of the force. It equals 1 kg⋅m²/s².
History
The joule is named after English physicist James Prescott Joule, who demonstrated the relationship between mechanical work and heat in the 1840s. It was adopted as the SI unit of energy in 1889 by the International Electrical Congress.
Current use
Joules are used universally in physics, engineering, and chemistry to quantify energy, work, and heat. They are the standard unit on food labels in many countries and in scientific research worldwide.
Kilojoules (kJ)
Definition
A kilojoule (kJ) is a unit of energy equal to 1,000 joules. It is commonly used for expressing larger quantities of energy in nutritional contexts and engineering.
History
The kilojoule naturally derives from the joule with the SI kilo- prefix. It gained widespread use in the 20th century, particularly in countries adopting the metric system for food energy labeling.
Current use
Kilojoules are the primary energy unit on food labels in Australia, New Zealand, and many European countries. They are also used in heating, ventilation, and chemical energy calculations.