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Unit Converters

Millimeters to Inches Converter

Convert millimeters (mm) to inches (in) instantly. 1 mm = 0.03937007874 in.

Free, no sign-upPrivate — runs in your browserUpdated October 2026
1 mm = 0.03937007874 in

In all length units

Millimeter1 mm
Centimeter0.1 cm
Meter0.001 m
Kilometer0.000001 km
Inch0.03937007874 in
Foot0.003280839895 ft
Yard0.001093613298 yd
Mile6.213712e-7 mi
Nautical mile5.399568e-7 nmi

How to convert millimeters to inches

Multiply the value in millimeters by 0.03937007874 (or divide by 25.4) to get inches.

1 mm = 0.03937007874 in

Example

To convert 10 millimeters to inches: 10 × 0.03937007874 = 0.3937007874 in.

mm to in conversion chart

Millimeters (mm)Inches (in)
0.1 mm0.003937007874 in
0.25 mm0.009842519685 in
0.5 mm0.01968503937 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
12 mm0.4724409449 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 the units

Millimeter (mm)

A millimeter is one thousandth of a meter. It is used for small, precise measurements such as screw sizes, rainfall and paper thickness.

Inch (in)

An inch is defined as exactly 2.54 centimeters. It is widely used in the US and UK for screens, tools and body measurements.

Related conversions

Inches to millimeters · Millimeters to centimeters · Millimeters to meters · Millimeters to kilometers · Millimeters to feet · Millimeters to yards · Millimeters to miles · Centimeters to inches · Meters to inches · Kilometers to inches · Feet to inches · All length units

Frequently asked questions

How many inches are in a millimeter?

There are 0.03937007874 inches in one millimeter. Multiply any value in millimeters by 0.03937007874 to convert it to inches.

What is 10 mm in in?

10 millimeters equals 0.3937007874 inches.

How do I convert inches back to millimeters?

Multiply by 25.4, since 1 in = 25.4 mm. You can also use our inches to millimeters converter.

What is a millimeter?

A millimeter is one thousandth of a meter. It is used for small, precise measurements such as screw sizes, rainfall and paper thickness.