Micrometres to Millimetres
Type a value in Micrometres and get the result in Millimetres, calculated exactly.
30 Micrometres = 0.03 Millimetres
Precision
Exact factorThis result is exact.
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Formula
mm = µm × 0.001
To convert Micrometres to Millimetres, multiply the value by 0.001.
Worked examples
- 1 µm × 0.001 = 0.001 mm
- 30 µm × 0.001 = 0.03 mm
- 100 µm × 0.001 = 0.1 mm
This factor is exact by definition.
Conversion table
| Micrometres (µm) | Millimetres (mm) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 60 | 0.06 |
| 70 | 0.07 |
| 75 | 0.075 |
| 80 | 0.08 |
| 90 | 0.09 |
| 100 | 0.1 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Millimetres to Micrometres
| Millimetres (mm) | Micrometres (µm) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7 | 7,000 |
| 8 | 8,000 |
| 9 | 9,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 30 | 30,000 |
| 40 | 40,000 |
| 50 | 50,000 |
| 60 | 60,000 |
| 70 | 70,000 |
| 75 | 75,000 |
| 80 | 80,000 |
| 90 | 90,000 |
| 100 | 100,000 |
Unit definitions
- Micrometres µm
- One millionth of a metre, also called a micron.
- Millimetres mm
- One thousandth of a metre.
Questions people ask
Micrometres to Millimetres: what is the conversion factor?
One µm is 0.001 mm.
How do I convert Micrometres to Millimetres?
Use the formula above. For example, 30 µm = 0.03 mm.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.