Convert Inches to Micrometers
1 inch (in) equals 25400 micrometers (µm).
1 in = 25400 µm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch to micrometer converter to paste a column from Excel.
How to Convert Inch to Micrometer
- 1 in = 25400 µm
- 1 µm = 0.00003937007874 in
- Example: convert 15 in to µm: 15 in = 15 × 25400 µm = 381000 µm
Reference conditions. in: The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.
Formula
µm = in × 25400
Derivation from SI units:
- 1 in = 2.54 cm = 0.0254 m (exact)
- 1 µm = 10⁻⁶ m
- 1 in = 0.0254 m ÷ 0.000001 m per µm = 25400 µm
Both units are defined exactly, so the factor is exact. Inch definition: inch; Micrometer definition: micrometer.
Worked examples
- A reading of 4 in converts to 101600 µm.
4 in × 25400 = 101600 µm - A value of 24 in is 609600 µm.
24 in × 25400 = 609600 µm
Inch to Micrometer conversion table
| Inches (in) | Micrometers (µm) |
|---|---|
| 0.125 in | 3175 µm |
| 0.25 in | 6350 µm |
| 0.5 in | 12700 µm |
| 0.75 in | 19050 µm |
| 1 in | 25400 µm |
| 1.5 in | 38100 µm |
| 2 in | 50800 µm |
| 3 in | 76200 µm |
| 4 in | 101600 µm |
| 5 in | 127000 µm |
| 6 in | 152400 µm |
| 8 in | 203200 µm |
| 10 in | 254000 µm |
| 12 in | 304800 µm |
| 15 in | 381000 µm |
| 20 in | 508000 µm |
| 24 in | 609600 µm |
| 27 in | 685800 µm |
| 32 in | 812800 µm |
| 36 in | 914400 µm |
| 48 in | 1219200 µm |
| 55 in | 1397000 µm |
| 65 in | 1651000 µm |
| 72 in | 1828800 µm |
Where it's used
Inches are used for screen and TV sizes (diagonal), while micrometers appear in particle and filter ratings (PM2.5, PM10, HEPA tested at 0.3 µm). Both measure length and distance, so the conversion is a fixed factor.
Inch to other length units
| Conversion | 1 in equals |
|---|---|
| inch to meter | 0.0254 m |
| inch to kilometer | 0.0000254 km |
| inch to centimeter | 2.54 cm |
| inch to millimeter | 25.4 mm |
| inch to micrometer | 25400 µm |
| inch to nanometer | 25400000 nm |
| inch to angstrom | 254000000 Å |
| inch to mile | 0.00001578282828 mi |
| inch to yard | 0.02777777778 yd |
| inch to foot | 0.08333333333 ft |
| inch to mil | 1000 mil |
| inch to nautical mile | 0.00001371490281 nmi |
Frequently asked questions
How many micrometers are in 1 inch?
1 in = 25400 µm.
How do I convert inches to micrometers?
Multiply the value in in by 25400. For example, 15 in × 25400 = 381000 µm.
Is the in to µm conversion exact?
Yes. Both units are defined exactly, and 1 in is exactly 25400 µm.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch (in)".
- 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). Convert Inches to Micrometers. Retrieved October 17, 2026, from https://scientificconverters.com/length/inches-to-micrometers/
IEEE
Scientific Converters, "Convert Inches to Micrometers," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/inches-to-micrometers/