Convert between mil (thousandth of an inch) and millimeter (mm) for precision measurements — 1 mil = 0.0254 mm exactly.
Select conversion direction:
Precision Length Conversion (Engineering Standard):
1 Mil = 0.0254 Millimeter (mm) | 1 Millimeter (mm) ≈ 39.3701 Mil
mm = mil × 0.0254 | mil = mm ÷ 0.0254 (Results shown with 4 decimal places)
*1 mil = 1/1000 inch; derived from 1 inch = 25.4 mm (international standard)
Mil (1/1000 inch) — used for thin materials: films, wires, coatings, PCB traces
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Quick conversions (common precision measurements) - click to auto-fill:
Useful for precision measurements? Share with engineers, manufacturers, or anyone working with thin materials:
Understanding precision length units for engineering, manufacturing, and micro-scale measurements.
| Unit | Symbol | Definition | Common Uses |
|---|---|---|---|
| Mil | mil | 1 mil = 1/1000 inch = 0.0254 mm (exact) | Thin films, wire insulation, PCB trace width, paper thickness, coating thickness |
| Millimeter | mm | 1 mm = 0.001 meter = 1000 micrometers (μm) | Engineering drawings, precision parts, electronic components, medical devices, manufacturing |
| Mil | ≈ | Millimeter (mm) | Real-World Application |
|---|---|---|---|
| 0.5 mil | ≈ | 0.0127 mm | Ultra-thin plastic film (food packaging) |
| 1 mil | ≈ | 0.0254 mm | Standard thin film coating |
| 10 mil | ≈ | 0.2540 mm | Thick paper (cardstock) or wire insulation |
| 100 mil | ≈ | 2.5400 mm | PCB trace width (power circuits) |
| 1000 mil | ≈ | 25.4000 mm | 1 inch (reference standard for precision parts) |
About mil, millimeter, and precision length conversions
The conversion is based on the international standard definition of the inch:
1 in = 25.4 mm (exact)
1 mil = 0.001 in = 0.0254 mm (exact)
1 mm = 1 ÷ 0.0254 mil ≈ 39.3701 mil
The choice depends on the industry standard and scale of the object:
Regional note: Mil is primarily used in the United States, while millimeter is the global standard for precision measurements. Many industries (e.g., electronics) use both, requiring frequent conversion.
All precision length units connect through the metric system and inch standard:
1 mil = 0.0254 mm = 25.4 micrometers (μm) (exact)
1 mm = 1000 μm = 39.3701 mil
1 μm = 0.001 mm = 0.0393701 mil
1 inch = 1000 mil = 25.4 mm = 25400 μm
Practical examples for micro-scale measurements:
This converter’s exact 0.0254 mm/mil factor ensures seamless conversion between imperial (mil) and metric (mm/μm) precision units.
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