Convert Millimetre [mm] to...

Unit system metric
Unit of length
Symbol mm
Unit conversions
1 mm in ... ... is equal to ...
SI units 1000 µm
1×10-3 m
Imperial/US unit(s) 0.039370 in

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Metric Conversion
Kilometre [km]
Hectometre [hm]
Decametre [dam]
Metre [m]
Decimetre [dm]
Centimetre [cm]
Millimetre [mm]
Micrometre [µm]
Nanometre [nm]
Angstrom [Å]
British/Imperial Conversion
Mile [mi]
Rod [rd]
Yard [yd]
Foot [ft]
Inch [in]
Mil [mil]
Thou [thou]
Nautical Conversion
Sea mile
Astronomical Conversion
Parsec [pc]
Light Year
Astronomical Unit [AE]
Light Minute
Light Second

The millimetre (International spelling as used by the International Bureau of Weights and Measures) or millimeter (American spelling) (SI unit symbol mm) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.

It is equal to 1000 micrometres or 1000000 nanometres. A millimetre is equal to exactly 5/127 (approximately 0.039370) of an inch.

Since 1983, the metre has been defined as "the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second". A millimetre, 1/1000 of a metre, is therefore the distance travelled by light in 1/299792458000 of a second.

This article uses material from the Wikipedia article "Millimetre", which is released under the Creative Commons Attribution-Share-Alike License 3.0.