Micrometres to millimetres converter
Millimetres (mm)
1 micrometre = 0.001 millimetres
How to convert micrometres to millimetres
mm = µm × 0.001
Multiply the number of micrometres by 0.001 to get millimetres. Going the other way, divide by 0.001 (or multiply by 1000).
One micrometre is exactly defined as 0.001 millimetres (to 12 significant figures), and one millimetre is 1000 micrometres.
Worked examples
- Convert 5 micrometres: 5 × 0.001 = 0.005 0.005 millimetres.
- Convert 12.5 micrometres: 12.5 × 0.001 = 0.0125 0.0125 millimetres.
- Convert 250 micrometres: 250 × 0.001 = 0.25 0.25 millimetres.
Quick-reference table
| µm | mm |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 1,000 | 1 |
| mm | µm |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
Related conversions
Frequently asked questions
How many millimetres are in 1 micrometre?
1 micrometre equals 0.001 millimetres.
What is the formula to convert micrometres to millimetres?
Use mm = µm × 0.001. Multiply the number of micrometres by 0.001 to get millimetres. Going the other way, divide by 0.001 (or multiply by 1000).
What is 100 micrometres in millimetres?
100 micrometres is 0.1 millimetres.