Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 MJ to GJ 36 MJ to GJ 49.5 MJ to GJ 50 MJ to GJ 54 MJ to GJ 72 MJ to GJ 108 MJ to GJ 180 MJ to GJ 500 MJ to GJ 1,000 MJ to GJ 50,000 MJ to GJ 100,000 MJ to GJ
Reverse Conversions
5 GJ to MJ 10 GJ to MJ 25 GJ to MJ 40.5 GJ to MJ 49.5 GJ to MJ 50 GJ to MJ 72 GJ to MJ 90 GJ to MJ 100 GJ to MJ 500 GJ to MJ 1,000 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

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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

Microwave 10 minutes 0.17 kWh
Boil 1 liter water 334 kJ
1 kWh 3.6 MJ
AA battery 10 kJ
Gasoline liter 34 MJ
Match stick 1 kJ

Formula

GJ = MJ × 0.001

Example

Example: convert 45 megajoules to gigajoules.

45 MJ = 0.045 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: 45 MJ → 0.045 GJ

Frequently Asked Questions

How much is 45 megajoules in gigajoules?

45 megajoules equals 0.045 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.