Joule to Kilojoule Converter (J to kJ)

How to Convert Joule to Kilojoule

Formula: Kilojoule = Joule × 0.001

Example: 1 J = 0.001 kJ

You can also use the interactive converter above. Simply enter any Joule value and the equivalent Kilojoule value will appear instantly. Click the ⇄ button to reverse the conversion.

A little context on Joule and Kilojoule helps this conversion stick, along with some frequently asked questions below.

Step-by-step example — Convert 1000 J to kJ:

What is Joule and Kilojoule?

A Joule (J) is the SI unit of energy, used as the scientific standard for measuring work and heat.

A Kilojoule (kJ) equals 1,000 joules and is used on nutrition labels in many countries outside the US.

Real World Uses of Joule to Kilojoule Conversion

• Joule: Commonly used for appearing on nutrition labels in some countries alongside kilojoules.
• Kilojoule: Commonly used for labeling food energy content in countries using the metric system.
• Joule: Commonly used in scientific formulas involving force, heat and electrical energy.
• Kilojoule: Commonly used on food labels outside the US to state energy content per serving.

Frequently Asked Questions

What is the formula to convert Joule to Kilojoule?

The formula is: Kilojoule = Joule x 0.001. Multiply any Joule value by 0.001 to get the equivalent in Kilojoule.

What is 1 Joule in Kilojoule?

1 J = 0.001 kJ.

How many Joule are in 1 Kilojoule?

1 kJ = 1000 J.

Is Joule bigger or smaller than Kilojoule?

Joule is smaller than Kilojoule. 1 Kilojoule = 1000 J.

What is 5000 J in kJ?

5000 J = 5 kJ.

What is 1000 kJ in J?

1000 kJ = 1,000,000 J.

How much energy is 1 joule in everyday terms?

1 joule is tiny — roughly the energy released when a small apple falls 1 meter, or about a quarter of a calorie.