Convert Micrometers to Millimeters

Enter the length in micrometers below to get the value converted to millimeters.

Results in Millimeters:

1 µm = 0.001 mm

How to Convert Micrometers to Millimeters

Tape measures can be used to measure units of length, and a calculator can be used to convert to another unit

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Convert micrometers to millimeters with this simple formula:

millimeters = micrometers × 0.001

Converting a micrometer length measurement to a millimeter measurement involves multiplying the length by the conversion ratio to find the result. One micrometer is equal to 0.001 millimeters, so to convert simply multiply by 0.001.

For example, here's how to convert 5 micrometers to millimeters using the formula above.

5 µm = (5 × 0.001) = 0.005 mm

Our inch fraction calculator can add micrometers and millimeters together and it also automatically converts the results to US customary, imperial and SI metric values.

Micrometers and millimeters are both units used to measure length. Learn more about length and find more length measurement conversion calculators. Micrometers are a metric measurement and can be abbreviated as µm, for example 1 µm. Millimeters are a metric measurement and can be abbreviated as mm, for example 1 mm. Learn more about the metric system, including the common unit prefixes and how to convert between metric units.

Millimeter is spelled millimetre internationally, and it is equal in length to .1 centimeters, 1000 micrometers, or ⁵/₁₂₇ inch. They are represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a dime is 1.35mm.

To get an idea of how small a millimeter is, a dime is 1.35mm thick.

A human hair is 40-50 micrometers thick or 0.000001 meters, making this a very small unit of measure. The micrometer is often referred to as a micron and internationally it is spelled micrometre.

We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs. If you need a ruler you can also download and print our free printable rulers which include both imperial and metric measurements.

micrometers and millimeters are units used to measure length

Convert Millimeters to Micrometers

Micrometer Measurements and Equivalent Millimeter Conversions

Common micrometer values converted to the equivalent millimeter value
Micrometers	Millimeters
1 µm	0.001 mm
2 µm	0.002 mm
3 µm	0.003 mm
4 µm	0.004 mm
5 µm	0.005 mm
6 µm	0.006 mm
7 µm	0.007 mm
8 µm	0.008 mm
9 µm	0.009 mm
10 µm	0.01 mm
11 µm	0.011 mm
12 µm	0.012 mm
13 µm	0.013 mm
14 µm	0.014 mm
15 µm	0.015 mm
16 µm	0.016 mm
17 µm	0.017 mm
18 µm	0.018 mm
19 µm	0.019 mm
20 µm	0.02 mm
21 µm	0.021 mm
22 µm	0.022 mm
23 µm	0.023 mm
24 µm	0.024 mm
25 µm	0.025 mm
26 µm	0.026 mm
27 µm	0.027 mm
28 µm	0.028 mm
29 µm	0.029 mm
30 µm	0.03 mm
31 µm	0.031 mm
32 µm	0.032 mm
33 µm	0.033 mm
34 µm	0.034 mm
35 µm	0.035 mm
36 µm	0.036 mm
37 µm	0.037 mm
38 µm	0.038 mm
39 µm	0.039 mm
40 µm	0.04 mm