Millimeters to Micrometers converter

To convert millimeters to micrometers, enter the value in the first field. The result in micrometers is calculated automatically using the exact conversion factor.

1 mm = 1000 µm
1 µm = 0.001 mm

Formula: µm = mm × 1000
mm = µm × 0.001

Definitions: 1 mm = 0.001 m; 1 µm = 1 × 10^-6 m

The millimeter (mm) is one thousandth of a meter. It is the standard unit for small dimensions in engineering drawings, machining and manufacturing, and for measuring rainfall depth.

The micrometer (µm), also called a micron, is one millionth of a meter. It is used for the thickness of thin films and fibers, for the size of bacteria, cells and dust particles, and for filter ratings (PM2.5 and PM10 count particles up to 2.5 and 10 µm).

See the conversion table with commonly used values, handy for quick reference or study.