Microns to Millimeters
Convert μm to mm quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.
1 micrometer equals 0.001 millimeters.
How to use the Microns to Millimeters
- Enter the number you want to convert.
- Confirm the source unit shown beside the input.
- Choose decimal precision if you need more or less detail.
- Read the converted result.
- Copy the result when you need to use it elsewhere.
How the conversion works
1 micrometer equals 0.001 millimeters.
For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.
Common μm to mm conversions
| μm | mm |
|---|---|
| 1 μm | 0.001 mm |
| 2 μm | 0.002 mm |
| 5 μm | 0.005 mm |
| 10 μm | 0.01 mm |
| 20 μm | 0.02 mm |
| 50 μm | 0.05 mm |
Example
For example, entering 1 μm gives approximately 0.001 mm using the rule above. Change the input to test your own value.
Frequently asked questions
Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.
Page reviewed: August 24, 2026.