Micrometers to Mils (µm to mil) Converter

How to convert micrometers to mils

Formulamil = µm × 0.03937007874

Because one mil equals 25.4 micrometers, you can also divide: mil = µm ÷ 25.4.

A micrometer is smaller than a mil: it takes 25.4 micrometers to make one mil.

Worked examples

1 micrometer1 µm × 0.03937007874 = 0.03937007874 mil
5 micrometers5 µm × 0.03937007874 = 0.1968503937 mil
10 micrometers10 µm × 0.03937007874 = 0.3937007874 mil
20 micrometers20 µm × 0.03937007874 = 0.7874015748 mil
100 micrometers100 µm × 0.03937007874 = 3.937007874 mil

Micrometers to mils conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Micrometers to mils: 0.1–10 µm
Micrometers (µm)	Mils (mil)
0.1 µm	0.0039370079 mil
0.25 µm	0.0098425197 mil
0.5 µm	0.019685039 mil
1 µm	0.039370079 mil
2 µm	0.078740157 mil
3 µm	0.11811024 mil
4 µm	0.15748031 mil
5 µm	0.19685039 mil
6 µm	0.23622047 mil
7 µm	0.27559055 mil
8 µm	0.31496063 mil
9 µm	0.35433071 mil
10 µm	0.39370079 mil

Micrometers to mils: 12–1,000 µm
Micrometers (µm)	Mils (mil)
12 µm	0.47244094 mil
15 µm	0.59055118 mil
20 µm	0.78740157 mil
25 µm	0.98425197 mil
30 µm	1.1811024 mil
40 µm	1.5748031 mil
50 µm	1.9685039 mil
75 µm	2.9527559 mil
100 µm	3.9370079 mil
250 µm	9.8425197 mil
500 µm	19.685039 mil
1,000 µm	39.370079 mil

About the units

Micrometer (µm)

One millionth of a metre, often called a micron. Human hair is roughly 50–100 µm across, and filter and particle sizes are given in micrometres. One micrometer equals 0.000001 meters (m).

Mil (mil)

One thousandth of an inch (0.0254 mm). Used for plastic-film and coating thickness and machining tolerances. One mil equals 0.0000254 meters (m).

Frequently asked questions

How many mils are in one micrometer?

There are 0.03937007874 mils in one micrometer, and this value is exact by definition.

How do I convert micrometers to mils?

Multiply the number of micrometers by 0.03937007874. For example, 10 µm × 0.03937007874 = 0.3937007874 mil.

How many micrometers are in one mil?

One mil equals 25.4 micrometers. That is the reverse factor, 1 ÷ 0.03937007874.

What is 10 micrometers in mils?

10 µm = 0.3937007874 mil.

Is this µm to mil converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Micrometers to Mils Converter