Convert Micrometers to Millimeters

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

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1 µm = 0.001 mm

How to Convert Micrometers to Millimeters

conversion scale showing micrometers and equivalent millimeters length values

To convert a micrometer measurement to a millimeter measurement, multiply the length by the conversion ratio. One micrometer is equal to 0.001 millimeters, so use this simple formula to convert:

millimeters = micrometers × 0.001

The length in millimeters is equal to the micrometers multiplied 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. Keep reading to learn more about each unit of measure.

Micrometers

One micrometer is equal to one-millionth (1/1,000,000) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.

The micrometer, or micrometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "micro" is the prefix for 10-6. A micrometer is sometimes also referred to as a micron. Micrometers can be abbreviated as µm, for example 1 micrometer can be written as 1 µm.

To get an idea of the actual physical length of a micrometer, one human hair is 40-50 µm thick, demonstrating how small this unit of measure is.

Millimeters

One millimeter is equal to one-thousandth (1/1,000) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.

The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "milli" is the prefix for 10-3. Millimeters can be abbreviated as mm, for example 1 millimeter can be written as 1 mm.

Millimeters are often represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a US dime is 1.35mm.

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.

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

More Micrometer Length Conversions

US Customary & Imperial Units
Convert to Miles
1 µm is equal to 6.2137E-10 miles
Convert to Yards
1 µm is equal to 1.0936E-6 yards
Convert to Feet
1 µm is equal to 3.2808E-6 feet
Convert to Inches
1 µm is equal to 3.937E-5 inches
SI Units
Convert to Kilometers
1 µm is equal to 1.0E-9 kilometers
Convert to Meters
1 µm is equal to 1.0E-6 meters
Convert to Centimeters
1 µm is equal to 0.0001 centimeters
Convert to Nanometers
1 µm is equal to 1,000 nanometers