Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 kJ to J 25 kJ to J 250 kJ to J 400 kJ to J 450 kJ to J 550 kJ to J 800 kJ to J 1,000 kJ to J 1,200 kJ to J 2,000 kJ to J 2,500 kJ to J 50,000 kJ to J
Reverse Conversions
1 J to kJ 5 J to kJ 10 J to kJ 25 J to kJ 50 J to kJ 250 J to kJ 550 J to kJ 800 J to kJ 1,200 J to kJ 2,500 J to kJ 10,000 J to kJ 100,000 J to kJ
More Energy Conversions
1 GJ to MJ 1 MJ to BTU 100 J to cal 1 GJ to kWh 2 GJ to MJ 2 MJ to BTU 100 kJ to kcal 1 MJ to kWh 1,000,000 J to MJ

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Popular Conversions

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Common Benchmarks

Gasoline liter 34 MJ
Boil 1 liter water 334 kJ
Food calorie 4184 J
100 W bulb for 1 hour 0.1 kWh
AA battery 10 kJ
Laptop full charge 200 kJ

Formula

J = kJ × 1000

Example

Example: convert 500 kilojoules to joules.

500 kJ = 500000 J

Conversion table

kilojoules (kJ) joules (J)
1 kJ 1000 J
2 kJ 2000 J
5 kJ 5000 J
10 kJ 10000 J
20 kJ 20000 J
50 kJ 50000 J
100 kJ 100000 J

Explanation

These are both units.

How to convert kilojoules to joules

  1. Start with the value in kilojoules (kJ).
  2. Multiply it by 1000.
  3. The result is the measurement in joules (J).

Example: 500 kJ → 500000 J

Frequently Asked Questions

How much is 500 kilojoules in joules?

500 kilojoules equals 500000 joules.

How many joules is 1 kilojoule?

1 kilojoule equals 1000 joules.

How many kilojoules is 1 joule?

1 joule equals 0.001 kilojoules.

What is the difference between kilojoules and joules?

Both measure energy in SI. The main difference is usually scale: some units are convenient for smaller values, while others are used to express larger values more practically.

Where are kilojoules and joules used?

They are used in physics and engineering to measure work, energy, and heat; the most practical unit depends on the magnitude.

Why does 1 kilojoule equal 1000 joules?

Because the “kilo-” prefix means 1000. One kilojoule equals 1000 joules.