# What is a mm on a ruler?

## What is a mm on a ruler?

On a metric ruler, each individual line represents a millimeter (mm). The numbers on the ruler represent centimeters (cm). There are 10 millimeters for each centimeter. To read a metric ruler, each individual line represents .

**What is the actual size of a mm?**

One millimetre is equal to 1000 micrometres or 1000000 nanometres. Since an inch is officially defined as exactly 25.4 millimetres, a millimetre is equal to exactly 5⁄127 (≈ 0.03937) of an inch….

millimetre | |
---|---|

kilometres | 1×10−6 km |

inches | 0.039370 in |

feet | 0.0032808 ft |

**How are millimeters measured on a ruler?**

Rulers are often 30 centimeters long, which are designated by large numbers on the ruler. Between each centimeter (cm) mark, there should be 10 smaller marks called millimeters (mm). Make sure you read the ruler from left to right. If you are measuring an object, align it with the left side of the zero mark on the ruler.

### Where are millimeters on a ruler?

Most rulers in the United States have markings on two sides: One side of the ruler has lines for measuring inches and feet, while the other side has lines for measuring millimeters and centimeters. The lines on the centimeter ruler side will be closer together than those on the inches/feet side.

**How many millimeters on a standard ruler?**

A Metric measure of distance used for small lengths. The abbreviation is mm. There are 1000 mm in one meter. The small lines on this ruler show mm. The ruler can measure up to 300 mm (the “30” means 30 centimeters which equals 300 millimeters)

**Can you show a centimeter side of a ruler?**

The centimeters side is usually the part of the ruler where the markers are shorter and closer together . It reads cm, and has more numbers.