Convert Micrometers to Millimeters
Convert Micrometers to Millimeters instantly. 1 Micrometer (µm) equals 0.001 Millimeters (mm).
Micrometers to Millimeters conversion table
| Micrometers (µm) | Millimeters (mm) |
|---|---|
| 1 µm | 0.001 mm |
| 2 µm | 0.002 mm |
| 3 µm | 0.003 mm |
| 5 µm | 0.005 mm |
| 10 µm | 0.01 mm |
| 20 µm | 0.02 mm |
| 50 µm | 0.05 mm |
| 100 µm | 0.1 mm |
| 500 µm | 0.5 mm |
| 1,000 µm | 1 mm |
1 Micrometer = 0.001 Millimeters · multiply Micrometers by 0.001
About converting Micrometers to Millimeters
Micrometers (µm) and Millimeters (mm) are both units of length, so converting between them is a single multiplication: multiply your Micrometers figure by 0.001. Ten Micrometers comes to 0.01 Millimeters, and a hundred works out at 0.1 Millimeters.
Rule of thumb: going from Micrometers to Millimeters divides, so the figure always shrinks — it takes about 1,000 Micrometers to make a single Millimeter. If your answer came out bigger, you have the conversion the wrong way round.
What is a Micrometer?
A micrometer — also called a micron — is one millionth of a meter, or one thousandth of a millimeter. It is the scale of things you need a microscope to see: bacteria, the individual pixels in a phone screen, the pollutants measured as PM2.5 in air-quality reports, and the feature sizes that chip manufacturing spent decades shrinking. A human hair is roughly 70 micrometers across, which makes it a useful mental ruler for the whole scale.
What is a Millimeter?
A millimeter is one thousandth of a meter, and it is where metric measurement starts getting genuinely precise. It is the working unit of engineering drawings, machine shops, rainfall figures and camera lenses — a "50 mm lens" and "12 mm of rain overnight" are both millimeter measurements. Technical drawings in most of the world default to millimeters precisely because it lets a draughtsman specify a whole component without ever writing a decimal point.
To put both in perspective: a human hair is around 70 micrometers thick, while a credit card is about 0.76 millimeters thick.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Millimeters to Micrometers converter, or browse all Length converters.
Frequently asked questions
How many Millimeters are in one Micrometer?
There are 0.001 Millimeters in one Micrometer.
How do I convert Micrometers to Millimeters?
Multiply the number of Micrometers by 0.001. For example, 10 Micrometers = 0.01 Millimeters.
What is 100 Micrometers in Millimeters?
100 Micrometers is equal to 0.1 Millimeters.
How do I convert Millimeters to Micrometers?
Multiply the Millimeters value by 1,000 (or divide by 0.001).
Is this Micrometers to Millimeters conversion exact?
Yes, exactly. Both units are fixed against the same base by definition, and 1 Micrometer = 0.001 Millimeters is the complete value — nothing is rounded away.
What is a Micrometer?
A micrometer — also called a micron — is one millionth of a meter, or one thousandth of a millimeter. It is the scale of things you need a microscope to see: bacteria, the individual pixels in a phone screen, the pollutants measured as PM2.5 in air-quality reports, and the feature sizes that chip manufacturing spent decades shrinking. A human hair is roughly 70 micrometers across, which makes it a useful mental ruler for the whole scale.
What is a Millimeter?
A millimeter is one thousandth of a meter, and it is where metric measurement starts getting genuinely precise. It is the working unit of engineering drawings, machine shops, rainfall figures and camera lenses — a "50 mm lens" and "12 mm of rain overnight" are both millimeter measurements. Technical drawings in most of the world default to millimeters precisely because it lets a draughtsman specify a whole component without ever writing a decimal point.