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.
You can use this form to select from known units:
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).
gigatonne to denaro [Italy]
gigatonne to tonneau [France]
gigatonne to centner [Germany]
gigatonne to lot [Germany]
gigatonne to troy pound
gigatonne to atomic mass unit 
gigatonne to megadalton
gigatonne to baht [Thailand]
gigatonne to obolus [Ancient Rome]
gigatonne to uncia [Rome]