Length and Area
intoμm
Convert inches (in) to micrometres (μm).
Factor1 in = 25400 μm
Converter
in
Accepts numbers or expressions, e.g. 150 + 14.7
Result
μm
Rendered to 6 significant figures.
Formula
Formula
μm = in × 25400
Multiply any value in inches by 25400 to obtain the value in micrometres.
Worked example
Convert 1 in to μm.
- 01Start with 1 in.
- 02Multiply by the conversion factor: 1 × 25400 = 25400 μm.
Result1 in = 25400 μm
Conversion table
| in | μm |
|---|---|
| 1 | 25400 |
| 2 | 50800 |
| 5 | 1.2700e+5 |
| 10 | 2.5400e+5 |
| 20 | 5.0800e+5 |
| 50 | 1.2700e+6 |
| 100 | 2.5400e+6 |
| 200 | 5.0800e+6 |
| 500 | 1.27e+7 |
| 1000 | 2.54e+7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from in to μm?
1 in equals 25400 μm. To convert, multiply the value in inches by 25400.
How do I convert 1 in to μm?
1 in = 25400 μm. For any value, multiply by 25400.
How do I convert μm back to in?
Divide by the same factor — or equivalently, multiply by 3.937008e-5. So 1 μm = 3.93701e-5 in.
When would I need to convert inch to micrometre?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both in and μm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).