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Conversion Formula:
µm = mm × 1000
Convert Millimeter to Micrometer (mm to µm) instantly with accurate, readable results.
Use our Length Unit Converter to quickly convert between meters, kilometers, feet, inches, miles, and more. This powerful unit conversion tool supports both metric and imperial systems, making it ideal for travel, engineering, education, and everyday use. Whether you're calculating distances or comparing measurements, our length unit conversion calculator ensures fast and accurate results every time.
From unit
Millimeter (mm) — one thousandth of a meter
Used for precision work, machining, and rainfall depth reporting. Suitable for tolerances and tiny parts.
- Symbol: mm
- System: SI derived unit
- Exact relations: 1 mm = 0.001 m = 0.1 cm
- Imperial/US equivalents: 1 mm = 0.0393700787 in
- Typical examples: screw diameters, gasket thickness, PCB traces
To unit
Micrometer (µm) — SI unit equal to one millionth of a meter
Used in precision engineering, microscopy, and semiconductor manufacturing for dimensions far below a millimeter
- Symbol: µm (also called micron)
- System: SI derived unit
- Exact relations: 1 µm = 10⁻⁶ m = 0.001 mm = 10⁻⁴ cm
- Imperial/US equivalents: 1 µm ≈ 0.0000393700787 in
- Typical examples: human hair ~70 µm; bacteria ~1–10 µm; semiconductor features in the sub-µm to tens of µm range