Mils to mm Converter

How to convert mils to millimeters

Formulamm = mil × 0.0254

Multiply the value in mils by 0.0254. To go the other way, multiply by 39.37007874 (or divide by 0.0254).

A mil is smaller than a millimeter: it takes 39.37007874 mils to make one millimeter.

Worked examples

1 mil (thou)1 mil × 0.0254 = 0.0254 mm
5 mils5 mil × 0.0254 = 0.127 mm
10 mils10 mil × 0.0254 = 0.254 mm
20 mils20 mil × 0.0254 = 0.508 mm
100 mils100 mil × 0.0254 = 2.54 mm

Mils to millimeters conversion table

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

Mils to millimeters: 0.1–10 mil
Mils (mil)	Millimeters (mm)
0.1 mil	0.00254 mm
0.25 mil	0.00635 mm
0.5 mil	0.0127 mm
1 mil	0.0254 mm
2 mil	0.0508 mm
3 mil	0.0762 mm
4 mil	0.1016 mm
5 mil	0.127 mm
6 mil	0.1524 mm
7 mil	0.1778 mm
8 mil	0.2032 mm
9 mil	0.2286 mm
10 mil	0.254 mm

Mils to millimeters: 12–1,000 mil
Mils (mil)	Millimeters (mm)
12 mil	0.3048 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
250 mil	6.35 mm
500 mil	12.7 mm
1,000 mil	25.4 mm

About the units

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).

Millimeter (mm)

One thousandth of a metre. Millimetres are the standard unit on engineering drawings, rulers and rainfall gauges; a credit card is about 0.76 mm thick. One millimeter equals 0.001 meters (m).

Frequently asked questions

How many millimeters are in one mil?

There are 0.0254 millimeters in one mil, and this value is exact by definition.

How do I convert mils to millimeters?

Multiply the number of mils by 0.0254. For example, 10 mil × 0.0254 = 0.254 mm.

How many mils are in one millimeter?

One millimeter equals 39.37007874 mils. That is the reverse factor, 1 ÷ 0.0254.

What is 10 mils in millimeters?

10 mil = 0.254 mm.

Is this mil to mm 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.