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Millimeters to Micrometers (mm to μm)
Convert millimeters to micrometers: 1 mm = 1000 μm. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 mm = 1000 μm
micrometers = millimeters × 1000 — reverse: millimeters = micrometers × 0.001
The factor is derived from the SI definitions of both units (base unit: m) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 mm = 5000 μm
- 12.5 mm = 12500 μm
- 100 mm = 100000 μm
Millimeters to micrometers conversion table
| Millimeters (mm) | Micrometers (μm) |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 4 | 4000 |
| 5 | 5000 |
| 6 | 6000 |
| 7 | 7000 |
| 8 | 8000 |
| 9 | 9000 |
| 10 | 10000 |
| 15 | 15000 |
| 20 | 20000 |
| 25 | 25000 |
| 30 | 30000 |
| 40 | 40000 |
| 50 | 50000 |
| 75 | 75000 |
| 100 | 100000 |
| 200 | 200000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
FAQ
How many micrometers are in one millimeter?
1 mm = 1000 μm. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert millimeters to micrometers?
Multiply the value in millimeters by 1000: micrometers = millimeters × 1000. For example, 5 mm = 5000 μm.
How do I convert micrometers back to millimeters?
Multiply by the inverse factor 0.001 (millimeters = micrometers × 0.001), or use the micrometers-to-millimeters page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=mm&to_unit=um - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"mm","to_unit":"um"} - Markdown: https://tttkmbb.com/conversion/mm-to-micrometers.md · JSON: https://tttkmbb.com/conversion/mm-to-micrometers.json (add
?value=for a result) · Units: /api/v1/units?quantity=length - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.