Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
5 GJ to MJ 16 GJ to MJ 18 GJ to MJ 22 GJ to MJ 24 GJ to MJ 40 GJ to MJ 48 GJ to MJ 80 GJ to MJ 200 GJ to MJ 250 GJ to MJ 2,500 GJ to MJ 50,000 GJ to MJ
Reverse Conversions
5 MJ to GJ 10 MJ to GJ 16 MJ to GJ 22 MJ to GJ 24 MJ to GJ 40 MJ to GJ 50 MJ to GJ 80 MJ to GJ 2,500 MJ to GJ 5,000 MJ to GJ 10,000 MJ to GJ 50,000 MJ to GJ
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 10,000 J to kJ

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Common Benchmarks

Match stick 1 kJ
Slice of bread 330 kJ
Boil 1 liter water 334 kJ
Phone battery 40 kJ
Cup of coffee 5 kJ
Gasoline liter 34 MJ

Formula

MJ = GJ × 1000

Example

Example: convert 20 gigajoules to megajoules.

20 GJ = 20000 MJ

Conversion table

gigajoules (GJ) megajoules (MJ)
1 GJ 1000 MJ
2 GJ 2000 MJ
5 GJ 5000 MJ
10 GJ 10000 MJ
20 GJ 20000 MJ
50 GJ 50000 MJ
100 GJ 100000 MJ

Explanation

These are both units.

How to convert gigajoules to megajoules

  1. Start with the value in gigajoules (GJ).
  2. Multiply it by 1000.
  3. The result is the measurement in megajoules (MJ).

Example: 20 GJ → 20000 MJ

Frequently Asked Questions

How much is 20 gigajoules in megajoules?

20 gigajoules equals 20000 megajoules.

How many megajoules is 1 gigajoule?

1 gigajoule equals 1000 megajoules.

How many gigajoules is 1 megajoule?

1 megajoule equals 0.001 gigajoules.

What is the difference between gigajoules and megajoules?

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 gigajoules and megajoules 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 gigajoule equal 1000 megajoules?

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