Convert Micrometer to Millimeter
Use this free converter to change micrometers (µm) into millimeters (mm). Micrometer and millimeter both measure length. As a quick reference, 1 µm equals 0.001 mm, and 1 mm equals 1000 µm.
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Millimeter (mm)
0.001
1 µm = 0.001 mm
Length conversion table
| Micrometer | Millimeter |
|---|---|
| 0.01 | 0.00001 |
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 1,000 | 1 |
How to convert Micrometer to Millimeter
Multiply the micrometer value by 0.001 to get millimeters.
- Enter the number of micrometers you want to convert.
- The converter instantly shows the equivalent value in millimeters.
- Worked example: 15 µm × 0.001 = 0.015 mm.
- Use the swap button to reverse the conversion (millimeter to micrometer).
About these units
Micrometer (µm)
- Definition
- A micrometer or micron (µm) is one millionth of a meter, used to measure microscopic objects.
- History
- The term "micron" was officially adopted in 1879 and renamed micrometer by the SI in 1967.
- Current use
- Micrometers describe cell sizes, bacteria, fibres, and semiconductor and optical manufacturing tolerances.
Millimeter (mm)
- Definition
- A millimeter (mm) is one thousandth of a meter, used where small, precise measurements are needed.
- History
- Like other metric subdivisions it was defined in the 1790s using the prefix "milli-" (one thousandth).
- Current use
- Engineers, machinists, and manufacturers specify tolerances in millimeters, and rainfall is commonly reported in mm.
Frequently asked questions
How many millimeters are in a micrometer?
There are 0.001 mm in 1 µm. To convert, multiply the number of micrometers by 0.001.
How do I convert micrometers to millimeters?
Multiply the micrometer value by 0.001 to get millimeters. For example, 10 µm = 0.01 mm.
Is this micrometer-to-millimeter converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Micrometer to other length units
| Unit | 1 Micrometer equals |
|---|---|
| Meter (m) | 0.000001 m |
| Kilometer (km) | 1.0000e-9 km |
| Centimeter (cm) | 0.0001 cm |
| Millimeter (mm) | 0.001 mm |
| Nanometer (nm) | 1000 nm |
| Mile (mi) | 6.2137e-10 mi |
| Yard (yd) | 0.0000010936133 yd |
| Foot (ft) | 0.0000032808399 ft |
| Inch (in) | 0.000039370079 in |
| Nautical Mile (nmi) | 5.3996e-10 nmi |
| Light Year (ly) | 1.0570e-22 ly |