A micrometer (µm) is a unit of length equal to one-millionth of a meter.

1 μm=10−6 m=0.001 mm1 μm=10−6 m=0.001 mm

Micrometer conversions

UnitEquivalent
1 micrometer (µm)0.001 millimeter
1 micrometer (µm)1,000 nanometers (nm)
1 millimeter (mm)1,000 micrometers
1 meter (m)1,000,000 micrometers

What do you mean by micrometer?

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1. Micrometer measuring instrument

A precision tool used to measure the thickness or diameter of small objects, such as wires, metal rods, and machine parts.

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2. Micrometer as a unit (µm)

Used to measure tiny things. For example, a human hair is typically about 50–100 µm thick.

Which one would you like to learn about?

  • The micrometer screw gauge and how to read it
  • Micrometer conversions and calculations