Convert mils (thousandths of an inch) to inches, fractional inches, mm, and µm. Includes AWG wire gauge reference and mil/inch quick-reference table.
A mil (thousandth of an inch) is the everyday unit for thin measurements in US manufacturing: PCB thicknesses, wire gauges, coating layers, shim stock, and machining tolerances. Converting between mils and inches — especially fractional inches — is a constant need on the shop floor and in engineering offices across design and production workflows for specification, fabrication, and inspection tasks under tight deadlines.
This mil-to-inch calculator provides instant bidirectional conversion between mils and decimal inches, plus fractional inches (to the nearest 1/64″), millimeters, micrometers, and centimeters. Preset buttons load common industrial values, and a 15-row quick-reference table maps mils to decimal inches, fractions, mm, and µm. A collapsible AWG wire gauge table lets you cross-reference wire diameters.
Whether you are selecting shim stock, measuring coatings, designing PCBs, or reading engineering drawings, this tool delivers the exact number you need in every relevant unit system. It is especially useful when teams must verify tolerances quickly before purchasing material, approving production runs, or documenting inspection results for quality control records.
Engineering drawings, shim-stock catalogs, wire-gauge charts, and coating specs all reference mils. Converting to decimal or fractional inches is needed for matching tools, drills, and hardware. This calculator does it instantly and adds mm/µm for international contexts. The AWG table is a bonus reference that saves a separate lookup during daily design and fabrication work. That combined workflow reduces unit-mismatch errors and helps teams move from design review to shop execution with fewer manual checks.
Mil to Inch: inches = mil ÷ 1,000 | Inch to Mil: mil = inches × 1,000. Related: 1 mil = 0.0254 mm = 25.4 µm.
Result: 0.062 in (1/16″) / 1.5748 mm
62 mil ÷ 1,000 = 0.062 inches. This is the standard FR4 PCB thickness of about 1/16 inch or 1.575 mm.
The mil (thousandth of an inch) sits at the intersection of machining, electronics, and coatings. Machining tolerances of ±1 mil are standard for precision components. CNC programs specify tool positions in inches but tolerances in mils. Understanding the mil ↔ inch relationship is essential for reading and generating engineering drawings in US shops.
American Wire Gauge (AWG) specifies conductor diameters in a logarithmic scale. Knowing the mil-equivalent helps when selecting wire for specific current-carrying capacity: 10 AWG (101.9 mil) handles 30 A, while 22 AWG (25.35 mil) handles about 7 A. The collapsible AWG table in this calculator provides quick cross-reference without leaving the page.
International suppliers quote dimensions in mm or µm. US engineers often need to convert those to mils for compatibility with existing tooling and documentation. A simple lookup — 0.5 mm = 19.69 mil — can prevent costly manufacturing errors when ordering from overseas vendors.
Divide by 1,000. For example, 250 mil ÷ 1,000 = 0.250 inches (¼ inch).
There are exactly 1,000 mils in one inch. This follows directly from the definition of a mil as one thousandth of an inch.
A mil is 0.0254 mm. One millimeter is approximately 39.37 mils. They are different units in different systems.
Each AWG gauge corresponds to a specific diameter in mils. For example, 22 AWG = 25.35 mil, 30 AWG = 10.03 mil.
62 mil (0.062 inches / 1.57 mm) is the standard thickness for a 4-layer FR4 PCB, one of the most common circuit-board specifications.
Yes. "Thou" is British English for one thousandth of an inch — the same unit as a mil.