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Millimeters to Inches Converter

1 millimeter = 0.03937007874 in. Enter any value to convert millimeters (mm) to inches (in), or use the table below for common values.

Results

1 mm =0.03937007874 inmillimeters → inches
1 mm0.03937007874 in
1 in25.4 mm
Formula
in = mm × 0.03937007874
1 mm in other units
UnitValue
centimeters (cm)0.1
meters (m)0.001
kilometers (km)0.000001
inches (in)0.03937007874
feet (ft)0.003280839895
yards (yd)0.001093613298
miles (mi)0.0000006213711922
nautical miles (nmi)0.0000005399568035

Formula

in = mm × 0.03937007874

Example: 10 mm = 0.3937007874 in. To convert the other way, use mm = in × 25.4.

Quick mental estimate: multiply by about 0.039.

Millimeters to Inches conversion table

Millimeters (mm)Inches (in)
1 mm0.03937007874 in
2 mm0.07874015748 in
3 mm0.1181102362 in
4 mm0.157480315 in
5 mm0.1968503937 in
6 mm0.2362204724 in
7 mm0.2755905512 in
8 mm0.3149606299 in
9 mm0.3543307087 in
10 mm0.3937007874 in
15 mm0.5905511811 in
20 mm0.7874015748 in
25 mm0.9842519685 in
30 mm1.181102362 in
40 mm1.57480315 in
50 mm1.968503937 in
75 mm2.952755906 in
100 mm3.937007874 in
250 mm9.842519685 in
500 mm19.68503937 in
1,000 mm39.37007874 in

About millimeters and inches

The millimeter is one thousandth of a meter. It is the standard unit on engineering drawings, for rainfall, and for screen, sheet and tool sizes.

The inch is defined as exactly 2.54 centimeters (international agreement of 1959). It is used in the US and UK for screen sizes, lumber, fasteners and body height.

Other Length conversions

Inches → MillimetersReverse conversionMillimeters → Centimetersmm → cmMillimeters → Metersmm → mMillimeters → Kilometersmm → kmMillimeters → Feetmm → ftMillimeters → Yardsmm → ydMillimeters → Milesmm → miMillimeters → Nautical Milesmm → nmiCentimeters → Inchescm → inMeters → Inchesm → inKilometers → Incheskm → inFeet → Inchesft → inYards → Inchesyd → inMiles → Inchesmi → inNautical Miles → Inchesnmi → in

Frequently asked questions

How do I convert millimeters to inches?

Use the formula in = mm × 0.03937007874. For example, 10 mm = 0.3937007874 in.

What is 1 millimeter in inches?

1 mm = 0.03937007874 in.

How do I convert inches back to millimeters?

Use mm = in × 25.4. 1 in = 25.4 mm.