SI units  

10×10^{−3} m  10 mm 
US customary / Imperial units  
32.81×10 ^{−3} ft  0.39370 in 
A centimetre (American spelling: centimeter, symbol cm) is a unit of length in the metric system, equal to one hundredth of a metre, which is the current SI base unit of length. Centi is the SI prefix for a factor of 10^{−2}.^{[1]} Hence a centimetre can be written as 10 × 10^{−3} m (engineering notation) or 1E−2 m (scientific E notation) — meaning 10 × 10^{1} mm or 1 m/100 respectively. The centimetre is 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 adult person (between 3/8" and 7/16" on an English inch ruler).
Contents 
1 centimetre is equal to:
1 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.

A centimetre (the American spelling is centimeter; symbol is cm) is a unit of length in the SI measurement system. It is one hundredth of a metre, which is why it is called a centimetre (centi is a word put on the start of measuring units to say 'a hundredth'). It is usually used to measure things that are too big for millimetres but too small for metres.
