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Unit system  SI 
Unit of  length 
Symbol  cm 
1 cm in...  is equal to... 
SI  10 mm 
imperial & US system  ~0.3937 in 
Unit system  SI 
Unit of  length 
Symbol  cm 
1 cm in...  is equal to... 
SI  10 mm 
imperial & US system  ~0.3937 in 
Look up centimetre in Wiktionary, the free dictionary. 
A centimetre (international spelling as used by the International Bureau of Weights and Measures; symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of ^{1}⁄_{100}.^{[1]} The centimetre was the base unit of length in the now deprecated centimetregramsecond (CGS) system of units.
Though for many physical quantities, SI prefixes for factors of 10^{3}—like milli and kilo—are often preferred by technicians, the centimetre remains a practical unit of length for many everyday measurements. A centimetre is approximately the width of the fingernail of an average adult person.
1 centimetre  = 10 millimetres 
= 0.01 metre  
≈ 0.393700787401575 inch^{[2]} 
One cubic centimetre is equal to 1 millilitre, under the current SI system of units.
In addition to its use in the measurement of length, the centimetre is used:
For the purposes of compatibility with Chinese, Japanese and Korean (CJK) characters, Unicode has symbols for:^{[5]}
They are mostly used only with East Asian fixedwidth CJK fonts, because they are equal in size to one Chinese character.
