Convert Joule to Kilojoule
Live bidirectional calculator for Joules (J) and Kilojoules (kJ) with verified formula and conversion charts.
Energy9 units
How the Calculation Works (Linear Scaling)
Since 1 Kilojoule = 1000 Joules, divide the value in Joules by 1000.
Joule to Kilojoule Conversion Table
Precomputed values for quick reference and printing.
| Joule | Kilojoule |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 3 J | 0.003 kJ |
| 4 J | 0.004 kJ |
| 5 J | 0.005 kJ |
| 6 J | 0.006 kJ |
| 7 J | 0.007 kJ |
| 8 J | 0.008 kJ |
| 9 J | 0.009 kJ |
| 10 J | 0.01 kJ |
| 15 J | 0.015 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 30 J | 0.03 kJ |
| 40 J | 0.04 kJ |
| 50 J | 0.05 kJ |
| 75 J | 0.075 kJ |
| 100 J | 0.1 kJ |
| Kilojoule | Joule |
|---|---|
| 1 kJ | 1000 J |
| 2 kJ | 2000 J |
| 3 kJ | 3000 J |
| 4 kJ | 4000 J |
| 5 kJ | 5000 J |
| 6 kJ | 6000 J |
| 7 kJ | 7000 J |
| 8 kJ | 8000 J |
| 9 kJ | 9000 J |
| 10 kJ | 10000 J |
| 15 kJ | 15000 J |
| 20 kJ | 20000 J |
| 25 kJ | 25000 J |
| 30 kJ | 30000 J |
| 40 kJ | 40000 J |
| 50 kJ | 50000 J |
| 75 kJ | 75000 J |
| 100 kJ | 100000 J |
About Joule (J)
The SI coherent derived unit of energy, equal to the work done by a force of one newton over a distance of one meter (1 Nยทm or 1 Wยทs).
History: Named in honor of English physicist James Prescott Joule for his experiments on the mechanical equivalent of heat.
Common Uses: Physics, mechanical work, kinetic energy, laser pulse energy.
About Kilojoule (kJ)
One thousand joules (10ยณ J).
History: Standard metric energy multiple widely used on international food nutrition labels.
Common Uses: Nutritional energy labeling worldwide, chemical enthalpy reactions.
โ Frequently Asked Questions
How many Kilojoules are in 1 Joule?
There are exactly 0.001 Kilojoules in 1 Joule (1 J = 0.001 kJ).
What is the formula to convert Joule to Kilojoule?
The formula is: Kilojoule = Joule / 1000. Since 1 Kilojoule = 1000 Joules, divide the value in Joules by 1000.
How do I convert 1 J to kJ manually?
To convert 1 J to kJ: apply the formula Kilojoule = Joule / 1000. Substituting gives: 1 / 1000 = 0.001 kJ.