Inch to Micron Formula
µ = in x 25400
Conversion factors follow SI relationships published by BIPM and NIST, where those standards apply.
Inch to Micron Converter
Quick Answer
1 in = 25400 µ
Formula: Micron = Inch x 25400
Quick values
Worked examples
Convert 1 in to µ
µ = 1 x 25400
Result: 1 in = 25400 µ
Convert 10 in to µ
µ = 10 x 25400
Result: 10 in = 254000 µ
Convert 100 in to µ
µ = 100 x 25400
Result: 100 in = 2540000 µ
About Inch and Micron
A micron (micrometre, µm) is 10⁻⁶ m. 1 inch = 25,400 microns exactly (25.4 mm × 1,000). Surface finish, filter ratings, and foil thickness mix inches and microns. The database also has a micrometer unit with the same factor; this page uses micron.
Category hub: Length Conversion · Conversion charts · Conversion formulas
Inch to Micron Conversion Table
| Inch (in) | Micron (µ) |
|---|---|
| 0.0001 in | 2.54 µ |
| 0.001 in | 25.4 µ |
| 0.005 in | 127 µ |
| 0.01 in | 254 µ |
| 0.025 in | 635 µ |
| 0.05 in | 1270 µ |
| 0.1 in | 2540 µ |
| 0.25 in | 6350 µ |
| 1 in | 25400 µ |
Browse all conversion charts → · Browse conversion formulas →
Practical use cases for Inch to Micron
Surface finish and grinding
Ra or stock removal written as 0.0002 in is 5.08 µm. Metrology reports often need the micron column for ISO drawings.
Filter and membrane ratings
A 0.0004 in opening is about 10 µm. HVAC and process filters are sold in microns while some US drawings stay in inches.
Foil, tape, and deposition
Metal foil and sputtered films specified as 0.001 in are 25.4 µm. Incoming certs convert so the lot matches the drawing.
Optical and semiconductor gaps
Air gaps and resist thickness on inch-based tooling convert to microns for process recipes written in SI.
Inch to Micron FAQs
Common questions about converting inch to micron.
How do you convert inches to microns?
Multiply inches by 25,400. Example: 0.001 in = 25.4 µm, 0.01 in = 254 µm, 1 in = 25,400 µm.
What is 0.005 inches in microns?
0.005 × 25,400 = 127 µm. That is a common plastic-shim or feeler-gauge thickness.
Is a micron the same as a micrometer?
Yes in length: both are 10⁻⁶ m. “Micrometer” can also mean the measuring instrument. This converter uses the micron unit from the length database.
Where does the inches to microns factor come from?
1 in = 25.4 mm exactly (international inch). 1 mm = 1,000 µm, so 1 in = 25,400 µm. NIST and BIPM publish the inch and the SI prefix micro.
Charts and printable PDF
Browse the conversion-chart library for printable inch / micron tables. PDF files are linked only when a matching download already exists.
Embed this converter
Add this in to micron calculator to another site with one async script or a lazy iframe. Keep the Powered by AllUnitConversions attribution so referrals stay canonical.
Docs: /embed?pair=in-to-micron · iframe source: /widget