Axis

Length & distance

millimetremm

Milli-scaled variant of the metre, exactly mm = 0.001 base unit.

Dimension
length
Canonical signature
L
System
si
Exactness
Exact

Definition record

How this unit is defined

Canonical base
1 mm = 0.001 m
Conversion type
linear
Historical notes
Defined through the fixed speed of light in vacuum, 299 792 458 m/s.
Aliases
milli meter, milli meters, milli 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 mm = 0.001 m

Exact relationship

10 mm = 0.01 m

Exact relationship