### What is a Micrometer?

The **Micrometre** (SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length equalling 1×10−6 meter (SI standard prefix "micro-" = 10−6); that is, one-millionth of a meter (or one-thousandth of a millimeter, 0.001 mm, or about 0.00004 inches).

A micrometer is a standard unit of measurement used to measure wavelengths of infrared radiations, sizes of biological cells and bacteria, and for grading wool by the diameter of the fibers.

The width of a single human hair ranges from approximately 20 to 200 μm. The longest human chromosome, chromosome 1, is approximately 10 μm in length.

### What is a Millimeter?

The **Millimetre** (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one-thousandth of a meter, which is the SI base unit of length. Therefore, there are one thousand millimeters in a meter and ten millimeters in a centimeter.

### How to Convert Micrometer to Millimeters?

To convert Micrometer to Millimeters, simply divide the Micrometer value by 1000.

The formula used to calculate Micrometer to Millimeters -

**d**_{(μm)} = **d**_{(mm)} / 1000

The distance *d* in Millimeters (mm) is equal to the distance *d* in Micrometers (μm) divided by 1000.

### How many Millimeters in a Micrometer

In simple terms, 1 μm is equal to 0.001 mm.

The formula used is 1/1000 = 0.001(mm)

### How many Micrometers in a Millimeter

1 Millimeter is equal to 1000 Micrometers. So we can also say that there are 1000 Micrometers in a Millimeter.

### Micrometer to Millimeters Conversion Table

Micrometer (μm) | Millimeter (mm) |
---|---|

0.01 (μm) | |

0.02 (μm) | |

0.03 (μm) | |

0.04 (μm) | |

0.05 (μm) | |

1 (μm) | |

2 (μm) | |

3 (μm) | |

4 (μm) | |

5 (μm) | |

6 (μm) | |

7 (μm) | |

8 (μm) | |

9 (μm) | |

10 (μm) | |

20 (μm) | |

30 (μm) | |

40 (μm) | |

50 (μm) | |

60 (μm) | |

70 (μm) | |

80 (μm) | |

90 (μm) | |

100 (μm) | |

200 (μm) | |

300 (μm) | |

400 (μm) | |

500 (μm) | |

600 (μm) | |

700 (μm) | |

800 (μm) | |

900 (μm) | |

1000 (μm) | |

5000 (μm) | |

10000 (μm) |