Micrometers to Millimeters Converter

1 micrometer (µm) equals 0.001 millimeters (mm).

Quick answer

  • 1 micrometer = 0.001 millimeters
  • 1 millimeter = 1,000 micrometers
  • Formula: mm = µm ÷ 1,000

1 micrometer = 0.001 millimeters

How to convert micrometers to millimeters

mm = µm ÷ 1,000

To convert micrometers to millimeters, divide the number of micrometers by 1,000.

Example: 18 µm to mm

  1. Start with the value in micrometers: 18 µm.
  2. Divide by 1,000: 18 ÷ 1,000 = 0.018.
  3. Result: 18 micrometers = 0.018 millimeters.

Going the other way, 1 millimeter = 1,000 micrometers, so to convert millimeters back to micrometers you multiply by the same number. See millimeters to micrometers.

Micrometers to millimeters conversion table

Micrometers (µm)Millimeters (mm)
0.25 µm 0.00025 mm
0.5 µm 0.0005 mm
0.75 µm 0.00075 mm
1 µm 0.001 mm
1.5 µm 0.0015 mm
2 µm 0.002 mm
2.5 µm 0.0025 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

More µm to mm values

What is a micrometer?

The micrometer (also micrometre, and commonly called the micron) is a metric unit of length equal to one millionth of a meter, or one thousandth of a millimeter.

More about micrometers →

What is a millimeter?

The millimeter (also spelled millimetre) is a metric unit of length equal to one thousandth of a meter, or one tenth of a centimeter.

More about millimeters →

Convert micrometers to other units

Convert other units to millimeters

Frequently asked questions

How many millimeters are in a micrometer?

One micrometer is 0.001 millimeters.

How many micrometers are in a millimeter?

One millimeter is 1,000 micrometers.

What is the formula to convert micrometers to millimeters?

mm = µm ÷ 1,000.