›› Measurement unit: cm

Full name: centimetre

Plural form: centimetres

Symbol: cm

Alternate spelling: centimeters

Category type: length

Scale factor: 0.01


›› SI unit: metre

The SI base unit for length is the metre.
1 metre is equal to 100 cm.


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›› Definition: Centimeter

A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundreth of a metre, the current SI base unit of length. A centimetre is part of a metric system. It is the base unit in the centimetre-gram-second system of units. A corresponding unit of area is the square centimetre. A corresponding unit of volume is the cubic centimetre.

The centimetre is a now a non-standard factor, in that factors of 103 are often preferred. However, it is practical unit of length for many everyday measurements. A centimetre is approximately the width of the fingernail of an adult person.


›› Sample conversions: cm

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