Micrometers to Millimeters Converter

Use this converter to easily convert between Micrometers and Millimeters (μm to mm). Micrometers are also known as Microns.

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    Quick navigation:
  1. How many Micrometers in one Millimeter?
  2. Difference between Micrometers and Millimeters
  3. How to convert Micrometers to Millimeters
  4. μm to mm conversion table

    How many Micrometers in one Millimeter?

Micrometers and millimeters are metric units that measure length. With the treaty signed in 1959 by the International System of Units, it was established that 1 millimeter (mm) is equal to 1,000 micrometers (µm), so there are 1,000 µm in one mm.

    Difference between Micrometers and Millimeters

Micro- and millimeters are derived from the fundamental metric unit that is the meter. Their purpose is to mark miniature changes in the dimensions of the observed object.

The micrometer is equivalent to one-millionth of a meter. It is 0.001 the scale of a millimeter. It is often referred to as the micron (although the term was revoked in 1967 by the International System of Units), which helps distinguish the unit from the measuring tool of the same name.

The µm is used for measuring the cell and its components’ sizes, infrared radiation wavelengths, etc. The length of an average bacterium is 1 µm, whereas the size of a fog, cloud or mist droplet is about 10 µm. Human hair’s diameter ranges from 17 to 181 micrometers.

The millimeter can be defined as being equivalent to the distance travelled by light in vacuum in 1/299,792,458,000 seconds. The wavelength of 300 GHz microwaves is 1 mm. Millimeters are usually the smallest units depicted on a standard ruler.

    How to convert Micrometers to Millimeters

Transforming micrometers to millimeters is based on the relationship between the two units. To convert µm to mm, you can either move the decimal point 3 positions to the left, or use this formula:

µm / 1,000 = mm.

μm to mm conversion example

Sample task: convert 500 micrometers to millimeters. Solution:

μm / 1000 = mm
500 μm / 1,000 = 0.50 mm
End result:
500 μm is equal to 0.50 mm

    μm to mm conversion table

μm to mm conversion table
μm mm
1 μm 0.001000 mm
2 μm 0.002000 mm
3 μm 0.003000 mm
4 μm 0.004000 mm
5 μm 0.005000 mm
6 μm 0.006000 mm
7 μm 0.007000 mm
8 μm 0.008000 mm
9 μm 0.009000 mm
10 μm 0.01 mm
20 μm 0.02 mm
30 μm 0.03 mm
40 μm 0.04 mm
50 μm 0.05 mm
60 μm 0.06 mm
70 μm 0.07 mm
80 μm 0.08 mm
90 μm 0.09 mm
100 μm 0.10 mm
200 μm 0.20 mm
300 μm 0.30 mm
400 μm 0.40 mm
500 μm 0.50 mm
600 μm 0.60 mm
700 μm 0.70 mm
800 μm 0.80 mm
900 μm 0.90 mm
1,000 μm 1 mm


1 NIST Special Publication 330 (2008) - "The International System of Units (SI)", edited by Barry N.Taylor and Ambler Thompson

2 International Organization for Standardization (1993). ISO Standards Handbook: Quantities and units (3rd edition). Geneva: ISO. ISBN 92-67-10185-4.

Cite this converter & page

If you'd like to cite this online converter resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "Micrometer to mm Converter", [online] Available at: https://www.gigacalculator.com/converters/convert-micrometer-to-mm.php URL [Accessed Date: 29 May, 2023].