Battery Equivalents and Replacements

Joules (J) to Kilojoules (kJ) Conversion Calculator and Table

Joules (J) to Kilojoules (kJ) are units of energy, and their conversions are simple and straightforward - one just has to remember that "k" stands for "kilo," which is, according to the SI prefixes table, 103 (one thousand) of the main value.

Published: January 13, 2024.

To convert Joules (J) to Kilojoules (kJ), write the value in Joules (J) and click 'Calculate':

Joules (J) to Kilojoules (kJ)

Joules (J):

Kilojoules (kJ):

To convert kilojoules to joules, check our Kilojoules (kJ) to Joules (J) Conversion Calculator and Table article.

How To Convert Joules (J) to Kilojoules (kJ)

"k" stands for "kilo" and means "one thousand." Thus, one Joule equals one-thousandth of a kilojoule.

1 J = 1/1000 kJ


1000 J = 1 kJ

For example, if You want to convert 1534 Joules to kilojoules, You can write:

1534 J = 1534 / 1000 kJ = 1.534 kJ

Joules (J) to Kilojoules (kJ) Conversion Table

The following chart contains the most common Joules (J) values converted to coulombs:

Joules (J) Kilojoules (kJ)
0.01 0.00001
0.1 0.0001
1 0.001
10 0.01
50 0.05
100 0.1
500 0.5
1000 1
5000 5
10000 10
100000 100


If You wish to convert values that are not in the table, please use the Joules (J) to Kilojoules (kJ) conversion calculator.

Short Intro to Joules: Understanding the Unit of Energy


In the realm of physics and everyday practical applications, the joule (symbol: J) stands as a fundamental unit of energy.

Named after the English physicist James Prescott Joule, it is used to measure various forms of energy, including mechanical, electrical, etc. energy.

Historical Background

The joule unit was named in honor of James Prescott Joule, an English physicist renowned for his work in the field of energy conservation.

Joule's pioneering experiments in the mid-19th century were very important in shaping the laws of thermodynamics.

His most famous discovery, now known as Joule's Law, demonstrates the relationship between heat and mechanical work, laying the groundwork for the concept of energy conservation.

The adoption of the joule as a unit of energy was a significant milestone in the standardization of measurements in science. It was officially recognized in the late 19th century when the International System of Units (SI) was being formulated.

The joule was defined to provide a universal standard for energy measurement, applicable across various scientific disciplines.

The Joule as a Unit of Energy

A joule is defined as the amount of work done when a force of one newton is applied over a distance of one meter.

In mathematical terms, it is expressed as:

1 Joule = 1 Newton * 1 meter

In practical terms, one joule is roughly equivalent to the energy required to lift a small apple one meter against the force of gravity.

In the field of electricity, the joule also represents the energy transferred when one ampere of current passes through a resistance of one ohm for one second.

1 Joule = 1 Amp * 1 Ohm * 1 second

This dual applicability in both mechanical and electrical contexts underscores the versatility and universality of the joule as a unit of energy.

Joules and Calories: A Comparative Analysis

The calorie is another widely used unit of energy, particularly in the context of food energy and nutrition.

Historically, the calorie was defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius.

This definition situates the calorie in the realm of thermodynamics and heat transfer.

The relationship between joules and calories is straightforward yet vital for cross-disciplinary applications. One calorie is equivalent to approximately 4.184 joules.

This conversion factor bridges the gap between mechanical energy measurements (joules) and heat or nutritional energy (calories), facilitating a comprehensive understanding of energy in various forms.

The joule, as a unit of energy, is indispensable in the fields of physics, engineering, and beyond. Its historical roots trace back to the fundamental principles of energy conservation, and its relation to the calorie provides a seamless integration of different energy contexts.

Understanding the joule and its applications paves the way for a deeper appreciation of the intricate energy dynamics that govern our universe.