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 centimetre–gram–second (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.
Centimetre  

A carpenter's rule with centimetre divisions


Unit information  
Unit system  metric 
Unit of  length 
Symbol  cm 
Unit conversions  
1 cm in ...  ... is equal to ... 
SI units  10 mm 
imperial & US system  ~0.3937 in 
1 centimetre  = 10 millimetres 
= 0.01 metres  
= 0.393700787401574803149606299212598425196850 inches  
(There are exactly 2.54 centimetres in one inch.) 
One 1 millilitre is defined as one cubic centimetre, under the 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:^{[4]}
They are mostly used only with East Asian fixedwidth CJK fonts, because they are equal in size to one Chinese character.
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