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Title: Millimeter  
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1 millimetre =
SI units
1×10−3 m 0.1 cm
US customary / Imperial units
3.2808×10^−3 ft 39.370×10^−3 in
Further information: Metre

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 1,000 micrometres and 1,000,000 nanometres. There are 25.4 mm in one inch.

Unicode symbols

For the purposes of compatibility with Chinese, Japanese and Korean (CJK) characters, Unicode has symbols for:

  • millimetre (㎜) - code U+339C
  • square millimetre (㎟) - code U+339F
  • cubic millimetre (㎣) - code U+33A3

They are useful for East Asian fixed-width CJK typography, because they are equal in proportion to one Chinese character.

See also


  • CJK Compatibility excerpt from The Unicode Standard, Version 4.1.
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