How do you convert joules to kilojoules?

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

Enter your value in the conversion calculator below.

Convert J to kJ

TIP: If the result of your conversion is 0, try increasing the "Decimals".

How to convert J to kJ: Enter a value in the J field and click on the "Calculate kJ" button. Your answer will appear in the kJ field.

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 to Kilojoules conversion

Joules to Kilojoules conversion calculator

It is a converter which is used to calculate the energy in joules to kilojoules. It is one of the easiest online calculators the fact that it does not require several units to determine the results in kilojoules. The joules to kilojoules calculator has a single text field which requires you to enter the energy in joules. Click the 'Convert' or 'Reset' button to execute the conversion. The result in kilojoules will be displayed below the two controls.

With the simplicity of this procedure, you can perform several conversions within a short period. Note that this calculator only executes a single conversion at a time, but when the ‘Reset' button is used, you can always enter new values that are to be converted. It erases the text field with a single click, after which you fill in the next value and click on the ‘Calculate' button to get the results.

Formula of calculating joules to kilojoules

The calculator uses a simple formula to perform the conversion. It only converts the value in joules to kilojoules and not the reverse.

It uses the formula;

E (kJ) = E (J) / 1000, which means that the energy in kilojoules is computed by dividing the energy in joules by 1000. The mathematical computation of joules to kilojoules is that one joule is equivalent to one thousand kilojoules. i.e. 1J = 0.001 kJ.

For example;

If the energy in joules is 650 J, what is the energy in Kilojoules?

Solution;

E (kJ) = E (J) / 1000

= 650 / 1000 = 0.65 Kilojoules (kJ)

The joules to kilojoules calculator is easily accessible which means you can use it at any time. It focusses on speed and delivers accurate results with a single click. Its simplicity makes it easier to use, and you can perform several conversions within a short period.

What is the difference between joules and kilojoules?

How many J's are in a kJ?