Millimeters to Micrometers Converter

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

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How many Micrometers equal one Millimeter?

Two of the units derived from the basic measurement unit of the metric system – the meter – are the millimeter and the micrometer. Their official abbreviations accepted by the International System of Units are respectively mm and µm. A micrometer is equal to 1/1,000 of a mm, so there are 1,000 µm in 1 millimeter.

Difference between Millimeters and Micrometers

The millimeter is a measurement unit used for the purpose of tracking small distances. Scientific, engineering, and mechanical tasks rely on accuracy and the mm is largely used when performing such.

Its definition – the path light travels in 1/299,792,458,000 seconds in vacuum – stems from the one of the meter. A millimeter is typically the smallest division marked on a ruler.

On the other hand, the micrometer is equivalent to 0.001 of a millimeter. It being of such small scale predetermines its application. The µm is usually used when measuring radiation wavelengths or cell sizes. The radius of a human hair ranges between 9 and 90 µm, while a droplet of mist, fog or cloud is about 10 µm in size.

The micrometer is also referred to as a micron, even though that term is not accepted by the SI. Using micron to name the unit is sometimes necessary in order to avoid confusion with the measuring tool called micrometer.

How to convert Millimeters to Micrometers

In order to convert millimeters to micrometers you can use the formula:

mm x 1,000 = µm,

or simply shift the decimal point in the millimeter three places to the right.

Mm to μm conversion example

Sample task: convert 30 millimeters to micrometers. Solution:

mm * 1000 = μm
30 mm * 1,000 = 30,000 μm
End result:
30 mm is equal to 30,000 μm

mm to μm conversion table

mm to μm conversion table
mm μm
1 mm 1,000 μm
2 mm 2,000 μm
3 mm 3,000 μm
4 mm 4,000 μm
5 mm 5,000 μm
6 mm 6,000 μm
7 mm 7,000 μm
8 mm 8,000 μm
9 mm 9,000 μm
10 mm 10,000 μm
20 mm 20,000 μm
30 mm 30,000 μm
40 mm 40,000 μm
50 mm 50,000 μm
60 mm 60,000 μm
70 mm 70,000 μm
80 mm 80,000 μm
90 mm 90,000 μm
100 mm 100,000 μm
200 mm 200,000 μm
300 mm 300,000 μm
400 mm 400,000 μm
500 mm 500,000 μm
600 mm 600,000 μm
700 mm 700,000 μm
800 mm 800,000 μm
900 mm 900,000 μm
1,000 mm 1,000,000 μm


[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., "Mm to micrometer Converter", [online] Available at: URL [Accessed Date: 12 Jun, 2021].