Full name: kilometre
Plural form: kilometres
Symbol: km
Alternate spelling: kilometers
Category type: length
Scale factor: 1000
The SI base unit for length is the metre.
1 metre is equal to 0.001 kilo-meter.
Valid units must be of the length type.
You can use this form to select from known units:
The SI prefix "kilo" represents a factor of 103, or in exponential notation, 1E3.
So 1 kilometre = 103 metre.