Micrometer (µm)
The micrometre (µm), often called a micron, is one millionth of a metre. A human hair is roughly 50–100 µm thick.
Symbol: µm (ASCII: um)
Quantity: length and distance
SI relation: 1 µm = 0.000001 m (exact)
Derivation: 1 µm = 10⁻⁶ m
Exact: yes, by definition
Typical uses
- Particle and filter ratings (PM2.5, PM10, HEPA tested at 0.3 µm)
- Coating thickness and surface roughness (Ra)
- Pore size of membranes and filter media
Convert micrometers to other units
| Conversion | 1 µm equals | Reverse |
|---|---|---|
| micrometer to meter | 0.000001 m | meter to micrometer |
| micrometer to kilometer | 1 × 10⁻⁹ km | kilometer to micrometer |
| micrometer to centimeter | 0.0001 cm | centimeter to micrometer |
| micrometer to millimeter | 0.001 mm | millimeter to micrometer |
| micrometer to mile | 6.213711922 × 10⁻¹⁰ mi | mile to micrometer |
| micrometer to foot | 0.000003280839895 ft | foot to micrometer |
| micrometer to inch | 0.00003937007874 in | inch to micrometer |
| micrometer to nanometer | 1000 nm | nanometer to micrometer |
| micrometer to yard | 0.000001093613298 yd | yard to micrometer |
| micrometer to nautical mile | 5.399568035 × 10⁻¹⁰ nmi | nautical mile to micrometer |
| micrometer to angstrom | 10000 Å | angstrom to micrometer |
| micrometer to mil | 0.03937007874 mil | mil to micrometer |
Open the Length Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Micrometer (µm). Retrieved October 17, 2026, from https://scientificconverters.com/units/micrometer/
IEEE
Scientific Converters, "Micrometer (µm)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/micrometer/