# CM to MM

If you want to understand the conversion between cm to mm, you are in the right place. Here are the most practical centimeters to millimeters.

Cm to mm is our common unit of length conversion. So how to convert cm to mm? First of all you should understand cm to mm conversion. Then you will find that converting centimeters to millimeters is so easy. ### How to Convert Centimeters to Millimeters?

1 cm = 10 mm

For example: Convert 5 centimeters to millimeters

5 cm = 5 cm × 10 = 50 mm

### Centimeter Definition

The symbol for centimeter is cm. It is a unit of length measurement and is also the International Standard Unit of Length. One centimeter is one-hundredth of a meter, and one-tenth of a decimeter.

The unit of length refers to the basic unit for measuring spatial distance. It is the basic unit developed by humans to regulate length. Its international unit is “meter” (symbol “m”), commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micrometer (μm), nanometer (nm) and so on. Units of length play an important role in various fields.

### Millimeter Definition

Millimeters are a unit of length measurement and a unit of rainfall. The English abbreviation is mm. 1 mm is equivalent to one thousandth of a meter, one hundredth of a decimeter, and one tenth of a centimeter.

One of the many metric prefixes is the milli-prefix. It is one thousandth of the base unit. In this case, it is the meter. Over time, the definition of a meter has changed. The current definition is based on how far one can travel at the speed of light over a certain time period. However, the relationship between the millimeter and the meter remains constant. The length of a prototype bar meter was the basis for the definition of the meter. The definition of a second has changed in 2019, and the meter was re-defined.