Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 kJ to J 25 kJ to J 50 kJ to J 250 kJ to J 1,000 kJ to J 10,000 kJ to J 25,000 kJ to J 36,000 kJ to J 44,000 kJ to J 64,000 kJ to J 96,000 kJ to J 100,000 kJ to J
Reverse Conversions
10 J to kJ 25 J to kJ 500 J to kJ 2,500 J to kJ 5,000 J to kJ 32,000 J to kJ 36,000 J to kJ 50,000 J to kJ 64,000 J to kJ 80,000 J to kJ 100,000 J to kJ 160,000 J to kJ
More Energy Conversions
1 MJ to BTU 100 J to cal 1 GJ to kWh 1 GJ to MJ 2 MJ to BTU 100 kJ to kcal 1 MJ to kWh 2 GJ to MJ 10 BTU to J 250 cal to J

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Popular Conversions

Kilowatt-Hours to Megajoules Megajoules to Kilowatt-Hours Joules to Calories Kilocalories to Kilojoules British Thermal Units to Joules Watt-Hours to Joules

Common Benchmarks

Boil 1 liter water 334 kJ
1 kWh 3.6 MJ
Microwave 10 minutes 0.17 kWh
Phone battery 40 kJ
AA battery 10 kJ
Slice of bread 330 kJ

Formula

J = kJ × 1000

Example

Example: convert 40000 kilojoules to joules.

40000 kJ = 40000000 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: 40000 kJ → 40000000 J

Frequently Asked Questions

How much is 40000 kilojoules in joules?

40000 kilojoules equals 40000000 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.