# ››Measurement unit: centimetre

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 centimetre.

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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.