📏 Mil Conversion
Translate mil measurements into inches, millimeters, micrometers, and more.
Commonly used in PCB design, coating thickness, and machining tolerances.
How to Use This Calculator
Enter mils
Type the thickness or dimension in mils (0.001 inch).
Review conversions
See equivalent sizes in inches, millimeters, micrometers, centimeters, and meters.
Apply results
Use the outputs for manufacturing notes, inspection sheets, or metric-only documentation.
Formula
Inches = mils ÷ 1,000
Millimeters = mils × 0.0254
Micrometers = mils × 25.4
Meters = mils × 2.54 × 10⁻⁵
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
The mil (or thou) is entrenched in North American manufacturing. Whether you’re working on circuit boards, plating, or film thickness, this converter makes it easy to communicate dimensions in metric or broader imperial units.
Quick access to both micrometers and millimeters helps when referencing international standards or scientific equipment.
Frequently Asked Questions
Is a mil the same as a thou?
Yes. Both terms mean 0.001 inch.
How many microns in a mil?
Exactly 25.4 micrometers.
Can I convert mils to mils?
This calculator focuses on converting mils to other units. For microns to mils use the dedicated page.
Does it support negative values?
Negative lengths are not physical, so negative inputs are treated as invalid.