Axis

Length & distance

kilometrekm

Kilo-scaled variant of the metre, exactly km = 1000 base unit.

Dimension
length
Canonical signature
L
System
si
Exactness
Exact

Definition record

How this unit is defined

Canonical base
1 km = 1,000 m
Conversion type
linear
Historical notes
Defined through the fixed speed of light in vacuum, 299 792 458 m/s.
Aliases
kilo meter, kilo meters, kilo m in length context

Same dimension

Related units

metresiminchimperial usinfootimperial usftmileimperial usmiyardimperial usydlight-yearastronomicallypixelcsspxnanometresinm

Common conversions

Every conversion routes through the canonical base of the dimension.

1 km = 1,000 m

Exact relationship

10 km = 10,000 m

Exact relationship