**Full name:** gigatonne

**Plural form:** gigatonnes

**Alternate spelling:** gigaton

**Category type:** weight

**Scale factor:** 1000000000000

The SI base unit for mass is the kilogram.
The SI derived unit for weight or force is the newton.

1 kilogram is equal to 1.0E-12 gigatonne.

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

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

So 1 gigatonne = 10^{9} tonnes.

The definition of a tonne is as follows:

A tonne (also called metric ton) is a non-SI unit of mass, accepted for use with SI, defined as: 1 tonne = 1000 kg (= 10^{6} g).

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