Millimetres to micrometres converter
Micrometres (µm)
1 millimetre = 1,000 micrometres
How to convert millimetres to micrometres
µm = mm × 1000
Multiply the number of millimetres by 1000 to get micrometres. Going the other way, divide by 1000 (or multiply by 0.001).
One millimetre is exactly defined as 1000 micrometres (to 12 significant figures), and one micrometre is 0.001 millimetres.
Worked examples
- Convert 5 millimetres: 5 × 1000 = 5,000 5,000 micrometres.
- Convert 12.5 millimetres: 12.5 × 1000 = 12,500 12,500 micrometres.
- Convert 250 millimetres: 250 × 1000 = 250,000 250,000 micrometres.
Quick-reference table
| 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 |
| 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 |
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Frequently asked questions
How many micrometres are in 1 millimetre?
1 millimetre equals 1,000 micrometres.
What is the formula to convert millimetres to micrometres?
Use µm = mm × 1000. Multiply the number of millimetres by 1000 to get micrometres. Going the other way, divide by 1000 (or multiply by 0.001).
What is 100 millimetres in micrometres?
100 millimetres is 100,000 micrometres.