Mils (mil)	Millimeters (mm)
1 mil	0.0254 mm
2 mil	0.0508 mm
5 mil	0.127 mm
10 mil	0.254 mm
25 mil	0.635 mm
50 mil	1.27 mm
100 mil	2.54 mm
250 mil	6.35 mm
500 mil	12.7 mm
1000 mil	25.4 mm

Convert Mils to Millimeters

Convert mils to millimeters (mil to mm) with our instant calculator. 1 mil = 0.0254 mm. Includes exact formula and reference tables.

How to Convert Mils to Millimeters (mil to mm)

1 Mil (Thou) (mil) is equal to 0.0254 Millimeters (mm). Multiply the mil (thou) value by 0.0254

Quick Answer 1 mil = 0.0254 mm

Formula mm = mil × 0.0254

Inverse Factor 1 mm = 39.370079 mil

Unit Definitions & Metrology Context

The standard SI base unit of length is the meter (m), defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

About Mils (mil): Mil (Thou) (mil) is a unit in the Length & Distance measurement category. It is widely used in 0.001 in (pcb traces, sheet metal, paint). Relative to the length & distance base unit, 1 mil equals 0.000025 Meters (m).

About Millimeters (mm): Millimeter (mm) is a unit in the Length & Distance measurement category. It is a standard everyday unit of length & distance measurement. Relative to the length & distance base unit, 1 mm equals 0.001 Meters (m).

Need to convert in the opposite direction? Visit our Convert Millimeters to Mils (mm to mil) calculator (1 mm = 39.370079 mil).

Step-by-Step Worked Examples (mil to mm)

Convert 5 Mils to Millimeters: Applying the formula (mm = mil × 0.0254): starting with 5 mil, multiply the mil (thou) value by 0.0254 to get 0.127 mm.
Convert 10 Mils to Millimeters: Applying the formula (mm = mil × 0.0254): starting with 10 mil, multiply the mil (thou) value by 0.0254 to get 0.254 mm.
Convert 50 Mils to Millimeters: Applying the formula (mm = mil × 0.0254): starting with 50 mil, multiply the mil (thou) value by 0.0254 to get 1.27 mm.

Popular Length & Distance Conversions

Kilometer ⇄ Mile

Multiply kilometers by ~0.621371 to get miles, or divide miles by 0.621371 to get kilometers.

Inch ⇄ Centimeter

1 inch is legally and scientifically defined as exactly 2.54 centimeters.

Foot ⇄ Meter

1 foot is defined as exactly 0.3048 meters (12 inches).

Mile ⇄ Nautical Mile

1 nautical mile is exactly 1,852 meters (~1.15078 statute miles).

Frequently Asked Questions

Verified answers and formulas for converting mils to millimeters.

How many millimeters are in 1 mil (thou)?

There are 0.0254 millimeters (mm) in 1 mil (thou) (mil). Conversely, 1 millimeter equals 39.370079 mils.

How do you convert mils to millimeters?

To convert mils (mil) to millimeters (mm), use the formula: mm = mil × 0.0254. Multiply the mil (thou) value by 0.0254. For example, 10 mil equals 0.254 mm.

How do I convert back from millimeters to mils?

To convert in the reverse direction from millimeters (mm) to mils (mil), use the inverse formula: mil = mm × 39.37007874. Multiply the millimeter value by 39.37007874 (1 mm = 39.370079 mil).

What is the difference between mil (thou) (mil) and millimeter (mm)?

Both mil (thou) and millimeter measure length & distance. Mil (Thou) (mil) is a unit in the Length & Distance measurement category. It is widely used in 0.001 in (pcb traces, sheet metal, paint). Relative to the length & distance base unit, 1 mil equals 0.000025 Meters (m). Millimeter (mm) is a unit in the Length & Distance measurement category. It is a standard everyday unit of length & distance measurement. Relative to the length & distance base unit, 1 mm equals 0.001 Meters (m).

How many miles are in a kilometer?

There are approximately 0.621371 miles in 1 kilometer. To convert kilometers to miles quickly in your head, multiply by 6 and divide by 10 (or multiply by 0.6).