Length and Area
μintomm
Convert microinches (μin) to millimetres (mm).
Factor1 μin = 2.54e-5 mm
Converter
μin
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mm
Rendered to 6 significant figures.
Formula
Formula
mm = μin × 2.54e-5
Multiply any value in microinches by 2.54e-5 to obtain the value in millimetres.
Worked example
Convert 100000 μin to mm.
- 01Start with 100000 μin.
- 02Multiply by the conversion factor: 100000 × 2.54e-5 = 2.54 mm.
Result100000 μin = 2.54 mm
Conversion table
| μin | mm |
|---|---|
| 1 | 2.54e-5 |
| 2 | 5.08e-5 |
| 5 | 0.000127 |
| 10 | 0.000254 |
| 20 | 0.000508 |
| 50 | 0.00127 |
| 100 | 0.00254 |
| 200 | 0.00508 |
| 500 | 0.0127 |
| 1000 | 0.0254 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from μin to mm?
1 μin equals 2.54e-5 mm. To convert, multiply the value in microinches by 2.54e-5.
How do I convert 1 μin to mm?
1 μin = 2.54e-5 mm. For any value, multiply by 2.54e-5.
How do I convert mm back to μin?
Divide by the same factor — or equivalently, multiply by 39370.08. So 1 mm = 39370.1 μin.
When would I need to convert microinch to millimetre?
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?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).