›› Measurement unit: gigameter

Full name: gigametre

Plural form: gigameters

Symbol: Gm

Alternate spelling: gigmetres

Category type: length

Scale factor: 1000000000

›› SI unit: metre

The SI base unit for length is the metre.
1 metre is equal to 1.0E-9 gigameter.

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A gigametre (American spelling: gigameter, symbol: Gm) is a unit of length equal to 10^9 metres. Its customary equivalent is 621,371 miles.