Mil to MM Converter
Convert mils (thousandths of an inch) to millimeters instantly and accurately
Quick Conversions
Conversion Formula
Mils to Millimeters:
Millimeters to Mils:
Conversion Factor: 1 mil = 0.0254 mm (exactly)
A mil (also called thou) equals one-thousandth of an inch (0.001 inch)
Conversion Examples
- Convert 10 mils to mm: 10 × 0.0254 = 0.254 mm
- Convert 50 mils to mm: 50 × 0.0254 = 1.27 mm
- Convert 100 mils to mm: 100 × 0.0254 = 2.54 mm
- Convert 500 mils to mm: 500 × 0.0254 = 12.7 mm
- Convert 1000 mils to mm: 1000 × 0.0254 = 25.4 mm
Mil to MM Conversion Table
| Mils (mil) | Millimeters (mm) |
|---|---|
| 0.01 mil | 0.000254 mm |
| 0.1 mil | 0.00254 mm |
| 1 mil | 0.0254 mm |
| 2 mil | 0.0508 mm |
| 3 mil | 0.0762 mm |
| 5 mil | 0.127 mm |
| 10 mil | 0.254 mm |
| 15 mil | 0.381 mm |
| 20 mil | 0.508 mm |
| 25 mil | 0.635 mm |
| 30 mil | 0.762 mm |
| 40 mil | 1.016 mm |
| 50 mil | 1.27 mm |
| 75 mil | 1.905 mm |
| 100 mil | 2.54 mm |
| 200 mil | 5.08 mm |
| 500 mil | 12.7 mm |
| 1000 mil | 25.4 mm |
What is a Mil?
Definition
A mil is an imperial unit of length equal to one-thousandth of an inch (0.001 inch). The term derives from the Latin word “millesimus” meaning thousandth.
Alternative Names
The mil is also commonly referred to as “thou” (pronounced like “thousand”) in manufacturing and engineering contexts.
Common Applications
Mils are widely used for measuring material thickness, coating thickness, manufacturing tolerances, and precision engineering applications.
Related Length Conversions
| From Mil To | Conversion Factor |
|---|---|
| Mil to Millimeter | 1 mil = 0.0254 mm |
| Mil to Micrometer (Micron) | 1 mil = 25.4 μm |
| Mil to Inch | 1 mil = 0.001 in |
| Mil to Centimeter | 1 mil = 0.00254 cm |
| Mil to Meter | 1 mil = 0.0000254 m |
| Mil to Nanometer | 1 mil = 25,400 nm |
Frequently Asked Questions
How many millimeters are in 1 mil?
One mil equals exactly 0.0254 millimeters. This conversion factor is based on the definition that 1 inch equals 25.4 mm, and since 1 mil is one-thousandth of an inch, 1 mil = 25.4 ÷ 1000 = 0.0254 mm.
How do I convert mils to millimeters?
To convert mils to millimeters, multiply the number of mils by 0.0254. For example, 20 mils × 0.0254 = 0.508 mm. You can also use our converter above for instant results.
How many mils are in 1 millimeter?
One millimeter equals approximately 39.3701 mils. To convert millimeters to mils, multiply the millimeter value by 39.3701. For instance, 5 mm × 39.3701 = 196.85 mils.
Is a mil the same as a millimeter?
No, a mil and a millimeter are different units from different measurement systems. A mil is an imperial unit (one-thousandth of an inch), while a millimeter is a metric unit. One mil equals 0.0254 mm, making a millimeter approximately 39.37 times larger than a mil.
What is the difference between mil and thou?
There is no difference between mil and thou – they are two names for the same unit of measurement. Both refer to one-thousandth of an inch. “Mil” comes from the Latin “millesimus” (thousandth), while “thou” is short for “thousandth.”
Why use mils instead of millimeters?
Mils are commonly used in industries and regions that work with imperial measurements, particularly in the United States. They are convenient for measuring small thicknesses in manufacturing, coating applications, and precision engineering when working within the imperial system.
How accurate is the mil to mm conversion?
The conversion factor of 1 mil = 0.0254 mm is exact and standardized. This makes the conversion between mils and millimeters completely accurate, with no rounding errors in the conversion factor itself.
Can I convert fractional mils to millimeters?
Yes, you can convert any fractional or decimal mil value to millimeters using the same conversion factor. Simply multiply the fractional mil value by 0.0254. For example, 0.5 mils × 0.0254 = 0.0127 mm.
Popular Mil to MM Conversions
Small Measurements
1 mil = 0.0254 mm
5 mil = 0.127 mm
10 mil = 0.254 mm
25 mil = 0.635 mm
Medium Measurements
50 mil = 1.27 mm
75 mil = 1.905 mm
100 mil = 2.54 mm
200 mil = 5.08 mm
Large Measurements
500 mil = 12.7 mm
750 mil = 19.05 mm
1000 mil = 25.4 mm
2000 mil = 50.8 mm