Convert kilojoule to joule
Enter the value to convert from kilojoule to joule.
How to Convert Kilojoule to Joule
Converting kilojoule to joule is straightforward using our conversion calculator.
Conversion Formula
J = kJ × 1000Reverse conversion: Convert joule to kilojoule
Comparison: Kilojoule vs Joule
When to Use Each Unit
Kilojoule: Primary unit for food energy labeling, metabolic studies, and medium-scale energy measurements in metric countries.
Joule: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Common Conversion Values
- 1 kJ = 1,000 J
- 1 kJ ≈ 0.239 kcal
- 1000 kJ = 1 MJ
- 1 kJ ≈ 0.948 BTU
About Kilojoule
Definition: The kilojoule (symbol: kJ) is equal to 1,000 joules, commonly used for food energy content and moderate energy measurements.
History: Standard metric prefix applied to joule for practical energy measurements in nutrition and engineering applications.
Current Use: Primary unit for food energy labeling, metabolic studies, and medium-scale energy measurements in metric countries.
Examples: Banana: 400 kJ, slice of bread: 300 kJ, chocolate bar: 2000 kJ, daily food intake: 8000-10000 kJ
About Joule
Definition: The joule (symbol: J) is the SI unit of energy, equal to the energy expended when applying one newton of force through one meter of distance.
History: Named after English physicist James Prescott Joule in 1889. Established the mechanical equivalent of heat and energy conservation.
Current Use: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Examples: Apple: 350,000 J, car battery: 4.3 MJ, lightning bolt: 1-5 billion J, human daily intake: 8-10 MJ