Online calculator to convert joules to kilojoules (J to kJ) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Energy units.
Conversion Calculator
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Convert J to kJ
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Conversion Definitions
The following is a list of definitions relating to conversions between joules and kilojoules.
What is a joule (J)?
A joule is a unit of energy in the International System of Units (SI). The symbol for joule is J. There are 1,000 joules in a kilojoule.
What is a kilojoule (kJ)?
A kilojoule is a unit of energy in the International System of Units (SI). The symbol for kilojoule is kJ. There are 0.001 kilojoules in a joule.
Conversion Formula
Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.
The formula to convert from J to kJ is:
kJ = J ÷ 1,000
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from joules to kilojoules (J to kJ).
Joule to Kilojoule Conversion Example
Task: Convert 475 joules to kilojoules (show work) Formula: J ÷ 1,000 = kJ Calculations: 475 J ÷ 1,000 = 0.475 kJ Result: 475 J is equal to 0.475 kJ
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from joules to kJ.
Joules to Kilojoules Conversion Chart
| joules (J) | kilojoules (kJ) |
|---|---|
| 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 |
| 20 J | 0.02 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 |
| 250 J | 0.25 kJ |
| 500 J | 0.5 kJ |
| 750 J | 0.75 kJ |
| 1,000 J | 1 kJ |
| 2,500 J | 2.5 kJ |
| 5,000 J | 5 kJ |
| 7,500 J | 7.5 kJ |
| 10,000 J | 10 kJ |
| 25,000 J | 25 kJ |
| 50,000 J | 50 kJ |
| 75,000 J | 75 kJ |
| 100,000 J | 100 kJ |
| 250,000 J | 250 kJ |
Related Units
This table provides a summary of the Energy units within their respective measurement systems.
| Unit | Symbol | Measurement System |
|---|---|---|
| calories (thermochemical) | cal | International System of Units (SI) |
| kilocalories | kcal | International System of Units (SI) |
| British Thermal Unit | BTU or Btu | Imperial System |
| joules | J | International System of Units (SI) |
| kilojoules | kJ | International System of Units (SI) |
| megajoules | MJ | International System of Units (SI) |
| gigajoules | GJ | International System of Units (SI) |
| terajoules | TJ | International System of Units (SI) |
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