# Centimeter (CM) Conversions

The centimeter or centimetre is a metric unit of length, equal to one hundredth of a metre, centi being the SI prefix for a factor of. The International System of Units (SI) of the centimeter is **cm**.

## Centimeter Usage

The two standard tools of measurement are:

**Ruler**: A ruler is the most common measurement tool in mathematics. It is used to measure small objects, for example, notebooks, pencils, and bottles. Most rulers come with two measurement metrics, centimeters, and inches and are made usually in lengths of 15 cm and 30 cm.**Meter Stick**: A meter stick is a measurement tool that measures one meter (hundred centimeters) and is used to measure things in meters and centimeters. Things like the length of a table or the width of a bag can be measured using a meter stick.