Microns to mm
Convert micrometers (microns) to millimeters and back. Used for filter ratings, plating thickness and particulate sizes.
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Common values
Formula
mm = µm × 0.001
A human hair is about 70 µm thick. PM10 means particles under 10 µm; PM2.5 means under 2.5 µm.
Frequently asked questions
QHow many mm is 1 µm?
1 µm is 0.001 mm, and 10 µm is 0.01 mm. Type any value in the box above to convert instantly.
QAnd how many µm is 1 mm?
1 mm is 1000 µm. This converter works both ways, so typing in the right box updates the left one.
QWhere is this unit used?
A human hair is about 70 µm thick. PM10 means particles under 10 µm; PM2.5 means under 2.5 µm.
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Traditional units (geun, doe, majigi and so on) vary by region and product.