## Measurement unit: gigajoule

**Full name:** gigajoule

**Plural form:** gigajoules

**Symbol:** GJ

**Category type:** energy

**Scale factor:** 1000000000

## SI unit: joule

The SI derived unit for energy is the joule.

1 joule is equal to 1.0E-9 gigajoule.

Valid units must be of the **energy** type.

You can use this form to select from known units:

## Definition: Gigajoule

The SI prefix "giga" represents a factor of
10^{9}, or in exponential notation, 1E9.

So 1 gigajoule = 10^{9} 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).

## Sample conversions: gigajoule