## ››Convert gigajoule to zettajoule

 gigajoule zettajoule

How many gigajoule in 1 zettajoule? The answer is 1000000000000.
We assume you are converting between gigajoule and zettajoule.
You can view more details on each measurement unit:
gigajoule or zettajoule
The SI derived unit for energy is the joule.
1 joule is equal to 1.0E-9 gigajoule, or 1.0E-21 zettajoule.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between gigajoules and zettajoules.
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## ››Definition: Gigajoule

The SI prefix "giga" represents a factor of 109, or in exponential notation, 1E9.

So 1 gigajoule = 109 joules.

The definition of a joule is as follows:

The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honor of the physicist James Prescott Joule (1818-1889).

## ››Definition: Zettajoule

The SI prefix "zetta" represents a factor of 1021, or in exponential notation, 1E21.

So 1 zettajoule = 1021 joules.

The definition of a joule is as follows:

The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honor of the physicist James Prescott Joule (1818-1889).

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