# Centimetre

A **centimetre** (international spelling) or **centimeter** (American spelling) (SI symbol **cm**) is a unit of length in the International System of Units (SI), equal to one hundredth of a metre, *centi* being the SI prefix for a factor of 1/100.[1] Equivalently, there are 100 centimetres in 1 metre. The centimetre was the base unit of length in the now deprecated centimetre–gram–second (CGS) system of units.

centimetre | |
---|---|

General information | |

Unit system | SI |

Unit of | length |

Symbol | cm |

Conversions | |

1 cm in ... | ... is equal to ... |

millimetres | 10 mm |

imperial & US system | ~0.3937 in |

*in Wiktionary, the free dictionary.*

**centimetre**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.