Convert micrometers to millimeters
1 µm = 0.001 mm — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.001mm
As a fraction: 1/1000
1 µm = 0.001 mm
How to convert micrometers to millimeters
Multiply the number of micrometers by 0.001 to get millimeters.
The exact factor is 0.001 — as a fraction, 1/1000.
Micrometer to Millimeter conversion table
| Micrometers (µm) | Millimeters (mm) |
|---|---|
| 1 µm | 0.001 |
| 2 µm | 0.002 |
| 3 µm | 0.003 |
| 5 µm | 0.005 |
| 10 µm | 0.01 |
| 20 µm | 0.02 |
| 25 µm | 0.025 |
| 50 µm | 0.05 |
| 100 µm | 0.1 |
| 250 µm | 0.25 |
| 500 µm | 0.5 |
| 1000 µm | 1 |
Millimeter to Micrometer conversion table
| Millimeters (mm) | Micrometers (µm) |
|---|---|
| 1 mm | 1000 |
| 2 mm | 2000 |
| 3 mm | 3000 |
| 5 mm | 5000 |
| 10 mm | 10 000 |
| 20 mm | 20 000 |
| 25 mm | 25 000 |
| 50 mm | 50 000 |
| 100 mm | 100 000 |
| 250 mm | 250 000 |
| 500 mm | 500 000 |
| 1000 mm | 1 000 000 |
Frequently asked
How many millimeters are in a micrometer?
One micrometer equals 0.001 millimeters (µm → mm). That figure is exact, not rounded.
How do you convert micrometers to millimeters?
Multiply the number of micrometers by 0.001 to get millimeters.
What is 1 mm in micrometers?
One millimeter is 1000 micrometers.
What is 10 µm in mm?
10 µm = 0.01 mm.