Table of Contents
Joules (J) and kilojoules (kJ) are units of energy in the International System of Units (SI). They are used to measure the amount of energy transferred, converted, or expended.
Joule (J)
The joule is the SI unit of energy. It is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter in the direction of the force. In other words, a joule is the work done when a force of one newton moves an object one meter. Joules are commonly used to measure various forms of energy, such as mechanical, thermal, electrical, and more.
Kilojoule (kJ)
The kilojoule is a larger unit of energy, equal to one thousand joules (1 kJ = 1000 J). It is often used to express larger amounts of energy, such as the energy content of food or the energy output of machines.
How to convert Joules to kJ
1J = 0.001kJ
E(kJ) = E(J) / 1000
Example – Convert 100 joules to kJ
Ans. E(kJ) = 100J / 1000 = 0.1kJ
Joules to kJ conversion table
| Energy (J) | Energy (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 |
| 60 J | 0.06 kJ |
| 70 J | 0.07 kJ |
| 80 J | 0.08 kJ |
| 90 J | 0.09 kJ |
| 100 J | 0.1 kJ |
| 200 J | 0.2 kJ |
| 300 J | 0.3 kJ |
| 400 J | 0.4 kJ |
| 500 J | 0.5 kJ |
| 600 J | 0.6 kJ |
| 700 J | 0.7 kJ |
| 800 J | 0.8 kJ |
| 900 J | 0.9 kJ |
| 1000 J | 1 kJ |
| 2000 J | 2 kJ |
| 3000 J | 3 kJ |
| 4000 J | 4 kJ |
| 5000 J | 5 kJ |
| 6000 J | 6 kJ |
| 7000 J | 7 kJ |
| 8000 J | 8 kJ |
| 9000 J | 9 kJ |
| 10000 J | 10 kJ |
| 100000 J | 100 kJ |
FAQs on Joules to kJ
How do you convert J to kJ?
To convert joules (J) to kilojoules (kJ), you need to divide the number of joules by 1000. This is because 1 kilojoule is equal to 1000 joules.
Is 1 joule equal to 1000 kJ?
No, that's not correct. 1 joule is not equal to 1000 kilojoules. Instead, 1 kilojoule is equal to 1000 joules.
What is bigger, kJ or J?
Kilojoules (kJ) are bigger than joules (J). This is because 1 kilojoule is equal to 1000 joules, so it's like having 1000 of something instead of just 1.
What is 1 J of energy?
1 joule of energy is a small amount. It's the energy needed to push or pull something with a force of 1 newton for a distance of 1 meter.
What is 1 J of energy equal to?
1 joule of energy is equal to doing a small task, like lifting an apple that weighs about 100 grams up to your desk, which is around the height of a typical book.
What is 1 joule equal to in KG?
A joule doesn't directly convert to kilograms (KG) because they measure different things. A joule is a unit of energy, and kilograms measure mass. It's like comparing apples to oranges – they're not the same kind of thing.
What is 1 joule of heat?
1 joule of heat is a small amount of heat energy. It's like the heat you might feel when you touch a warm cup of tea for a moment. Heat is a form of energy that makes things feel warm or hot.
