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By Shailendra Singh
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Updated on 5 Mar 2025, 17:33 IST
Kilojoules (kJ) and joules (J) are units used to measure energy.
A kilojoule is a larger unit of energy, equal to one thousand joules (1 kJ = 1000 J). It’s commonly used to quantify the energy content of food, the power output of machines, and other larger amounts of energy.
The joule is the basic unit of energy in the International System of Units (SI). It’s 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. Joules are used to measure various forms of energy, such as mechanical, thermal, electrical, and more.
1kJ = 1000J
Conversion formula
E(J) = E(kJ) × 1000
Example – Convert 12 kilojoules to joules.
Ans. Energy E in joules (J) is equal to 3 kilojoules times 1000:
E(J) = 12kJ × 1000 = 12000J
| Energy (kJ) | Energy (J) |
| 0.001 kJ | 1 J |
| 0.01 kJ | 10 J |
| 0.1 kJ | 100 J |
| 0.2 kJ | 200 J |
| 0.3 kJ | 300 J |
| 0.4 kJ | 400 J |
| 0.5 kJ | 500 J |
| 0.6 kJ | 600 J |
| 0.7 kJ | 700 J |
| 0.8 kJ | 800 J |
| 0.9 kJ | 900 J |
| 1 kJ | 1000 J |
| 2 kJ | 2000 J |
| 3 kJ | 3000 J |
| 4 kJ | 4000 J |
| 5 kJ | 5000 J |
| 6 kJ | 6000 J |
| 7 kJ | 7000 J |
| 8 kJ | 8000 J |
| 9 kJ | 9000 J |
| 10 kJ | 10000 J |
| 100 kJ | 100000 J |
Converting kilojoules (kJ) to joules (J) is simple. Multiply the amount in kilojoules by 1000. This gives you the equivalent amount in joules.
No, that's not accurate. 1 joule is equal to 0.001 kilojoules (1 J = 0.001 kJ).
Yes, 1 kilojoule is equal to 1000 joules (1 kJ = 1000 J).
To convert kilojoules to joules, multiply the amount in kJ by 1000. So, 25 kJ is equal to 25000 J.
1 joule of energy is equal to the energy needed to apply a force of 1 newton over a distance of 1 meter. It's a small amount of energy.
1 joule of energy represents a small burst of energy. It's like the energy needed to lift a small apple about 1 meter off the ground.
The formula for joules depends on the context. In simple terms, the energy in joules is calculated by multiplying the force in newtons by the distance in meters over which the force is applied (J = N × m).
J stands for joules, the unit of energy in the International System of Units (SI).
kJ stands for kilojoules, which is a larger unit of energy. It's equal to one thousand joules and is often used to measure larger amounts of energy, such as in food or machine power.