Convert Mil (mil) to Microinch (µin) instantly.
About these units
Mil (mil)
A mil is an imperial-derived engineering unit equal to one-thousandth of an inch. It is used extensively in manufacturing, machining, and electrical engineering. Printed circuit board (PCB) trace widths, for instance, are often measured in mils because the unit provides a convenient scale for precision without resorting to decimals in inches. Because 1 mil equals 25.4 micrometers, it occupies a scale appropriate for tolerances in industrial production, coatings, film thickness, and gaskets. The mil is especially common in the United States, where certain engineering standards still rely on the imperial system. It provides an intuitive small-scale measurement for technicians accustomed to inches, helping avoid errors that might result from metric conversions.
Microinch (µin)
A microinch is one-millionth of an inch, approximately 2.54 × 10⁻⁸ meters. It is a precision unit used primarily in engineering, machining, and electronics. Microinches allow engineers to describe tolerances, surface roughness, and component dimensions with extreme accuracy. This is especially relevant in semiconductor manufacturing and microelectronics, where deviations of just a few microinches can impact performance. Although rarely encountered outside technical fields, the microinch demonstrates the need for highly granular units in modern technology, bridging the gap between traditional inches and nanometer-scale measurements.