Full name: megametre
Plural form: megameters
Alternate spelling: megametres
Category type: length
Scale factor: 1000000
The SI base unit for length is the metre.
1 metre is equal to 1.0E-6 megametre.
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A megametre (American spelling: megameter, symbol: Mm) is a unit of length equal to 10^6 metres (from the Greek words megas = big and metro = count/measure). Its customary equivalent is 621.37 miles.