Full name: gigatonne
Plural form: gigatonnes
Alternate spelling: gigaton
Category type: weight
Scale factor: 1.0E+12
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 109, or in exponential notation, 1E9.
So 1 gigatonne = 109 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 (= 106 g).