Full name: micromillimetre
Plural form: micromillimetres
Symbol: µmm
Alternate spelling: micromillimeters
Category type: length
Scale factor: 1.0E-9
The SI base unit for length is the metre.
1 metre is equal to 1000000000 micro millimeter.
Valid units must be of the length type.
You can use this form to select from known units:
The SI prefix "micro" represents a factor of 10-6, or in exponential notation, 1E-6.
So 1 micromillimetre = 10-6 millimetre.