Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 MJ to GJ 20 MJ to GJ 22.5 MJ to GJ 27.5 MJ to GJ 30 MJ to GJ 40 MJ to GJ 50 MJ to GJ 60 MJ to GJ 100 MJ to GJ 1,000 MJ to GJ 2,500 MJ to GJ 25,000 MJ to GJ
Reverse Conversions
5 GJ to MJ 10 GJ to MJ 20 GJ to MJ 25 GJ to MJ 30 GJ to MJ 60 GJ to MJ 250 GJ to MJ 500 GJ to MJ 2,500 GJ to MJ 10,000 GJ to MJ 50,000 GJ to MJ 100,000 GJ to MJ
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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Common Benchmarks

Food calorie 4184 J
Phone battery 40 kJ
1 kWh 3.6 MJ
Slice of bread 330 kJ
Gasoline liter 34 MJ
AA battery 10 kJ

Formula

GJ = MJ × 0.001

Example

Example: convert 25 megajoules to gigajoules.

25 MJ = 0.025 GJ

Conversion table

megajoules (MJ) gigajoules (GJ)
1 MJ 0.001 GJ
2 MJ 0.002 GJ
5 MJ 0.005 GJ
10 MJ 0.01 GJ
20 MJ 0.02 GJ
50 MJ 0.05 GJ
100 MJ 0.1 GJ

Explanation

These are both units.

How to convert megajoules to gigajoules

  1. Start with the value in megajoules (MJ).
  2. Multiply it by 0.001.
  3. The result is the measurement in gigajoules (GJ).

Example: 25 MJ → 0.025 GJ

Frequently Asked Questions

How much is 25 megajoules in gigajoules?

25 megajoules equals 0.025 gigajoules.

How many gigajoules is 1 megajoule?

1 megajoule equals 0.001 gigajoules.

How many megajoules is 1 gigajoule?

1 gigajoule equals 1000 megajoules.

What is the difference between megajoules and gigajoules?

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 megajoules and gigajoules 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 megajoule equal 0.001 gigajoules?

Because the units are defined with a fixed relationship. To convert megajoules to gigajoules, multiply by that factor.