Convert Millimeters to Micrometers
Convert Millimeters to Micrometers instantly. 1 Millimeter (mm) equals 1,000 Micrometers (µm).
Millimeters to Micrometers conversion table
| Millimeters (mm) | Micrometers (µm) |
|---|---|
| 1 mm | 1,000 µm |
| 2 mm | 2,000 µm |
| 3 mm | 3,000 µm |
| 5 mm | 5,000 µm |
| 10 mm | 10,000 µm |
| 20 mm | 20,000 µm |
| 50 mm | 50,000 µm |
| 100 mm | 100,000 µm |
| 500 mm | 500,000 µm |
| 1,000 mm | 1,000,000 µm |
1 Millimeter = 1,000 Micrometers · multiply Millimeters by 1,000
About converting Millimeters to Micrometers
Millimeters (mm) and Micrometers (µm) are both units of length, so converting between them is a single multiplication: multiply your Millimeters figure by 1,000. Ten Millimeters comes to 10,000 Micrometers, and a hundred works out at 100,000 Micrometers.
Rule of thumb: going from Millimeters to Micrometers multiplies, so the figure always grows — one Millimeter is already 1,000 Micrometers. If your answer came out smaller, you have the conversion the wrong way round.
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.
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.
To put both in perspective: a credit card is about 0.76 millimeters thick, while a human hair is around 70 micrometers thick.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Micrometers to Millimeters converter, or browse all Length converters.
Frequently asked questions
How many Micrometers are in one Millimeter?
There are 1,000 Micrometers in one Millimeter.
How do I convert Millimeters to Micrometers?
Multiply the number of Millimeters by 1,000. For example, 10 Millimeters = 10,000 Micrometers.
What is 100 Millimeters in Micrometers?
100 Millimeters is equal to 100,000 Micrometers.
How do I convert Micrometers to Millimeters?
Multiply the Micrometers value by 0.001 (or divide by 1,000).
Is this Millimeters to Micrometers conversion exact?
The definition is exact — Millimeters and Micrometers are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
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.
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.