Mils (mil)	Micrometers (µm)
1 mil	25.4 µm
2 mil	50.8 µm
5 mil	127 µm
10 mil	254 µm
25 mil	635 µm
50 mil	1270 µm
100 mil	2540 µm
250 mil	6350 µm
500 mil	12700 µm
1000 mil	25400 µm

Convert Mils to Micrometers

Convert mils to micrometers (mil to µm) with our instant calculator. 1 mil = 25.4 µm. Includes exact formula and reference tables.

How to Convert Mils to Micrometers (mil to µm)

1 Mil (Thou) (mil) is equal to 25.4 Micrometers (µm). Multiply the mil (thou) value by 25.4

Quick Answer 1 mil = 25.4 µm

Formula µm = mil × 25.4

Inverse Factor 1 µm = 0.03937 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 Micrometers (µm): Micrometer (µm) is a unit in the Length & Distance measurement category. It is widely used in microns (cells, fibers). Relative to the length & distance base unit, 1 µm equals 0.000001 Meters (m).

Need to convert in the opposite direction? Visit our Convert Micrometers to Mils (µm to mil) calculator (1 µm = 0.03937 mil).

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

Convert 5 Mils to Micrometers: Applying the formula (µm = mil × 25.4): starting with 5 mil, multiply the mil (thou) value by 25.4 to get 127 µm.
Convert 10 Mils to Micrometers: Applying the formula (µm = mil × 25.4): starting with 10 mil, multiply the mil (thou) value by 25.4 to get 254 µm.
Convert 50 Mils to Micrometers: Applying the formula (µm = mil × 25.4): starting with 50 mil, multiply the mil (thou) value by 25.4 to get 1270 µm.

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 micrometers.

How many micrometers are in 1 mil (thou)?

There are 25.4 micrometers (µm) in 1 mil (thou) (mil). Conversely, 1 micrometer equals 0.03937 mils.

How do you convert mils to micrometers?

To convert mils (mil) to micrometers (µm), use the formula: µm = mil × 25.4. Multiply the mil (thou) value by 25.4. For example, 10 mil equals 254 µm.

How do I convert back from micrometers to mils?

To convert in the reverse direction from micrometers (µm) to mils (mil), use the inverse formula: mil = µm × 0.03937007874. Multiply the micrometer value by 0.03937007874 (1 µm = 0.03937 mil).

What is the difference between mil (thou) (mil) and micrometer (µm)?

Both mil (thou) and micrometer 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). Micrometer (µm) is a unit in the Length & Distance measurement category. It is widely used in microns (cells, fibers). Relative to the length & distance base unit, 1 µm equals 0.000001 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).