Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
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Related Conversions
1 MJ to GJ 5 MJ to GJ 50 MJ to GJ 100 MJ to GJ 1,000 MJ to GJ 2,500 MJ to GJ 3,200 MJ to GJ 4,400 MJ to GJ 5,000 MJ to GJ 16,000 MJ to GJ 40,000 MJ to GJ 80,000 MJ to GJ
Reverse Conversions
5 GJ to MJ 10 GJ to MJ 25 GJ to MJ 50 GJ to MJ 100 GJ to MJ 250 GJ to MJ 1,000 GJ to MJ 4,400 GJ to MJ 6,400 GJ to MJ 8,000 GJ to MJ 9,600 GJ to MJ 80,000 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

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Popular Conversions

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Common Benchmarks

AA battery 10 kJ
100 W bulb for 1 hour 0.1 kWh
Food calorie 4184 J
Microwave 10 minutes 0.17 kWh
Boil 1 liter water 334 kJ
1 kWh 3.6 MJ

Formula

GJ = MJ × 0.001

Example

Example: convert 4000 megajoules to gigajoules.

4000 MJ = 4 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: 4000 MJ → 4 GJ

Frequently Asked Questions

How much is 4000 megajoules in gigajoules?

4000 megajoules equals 4 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.