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Millimeters to Inches Converter

Convert millimeters (mm) to inches (in) as you type — 1 mm = 0.03937 in. Switch units, change the precision or copy the result.

How to use this tool

Steps for using the Unit Converter.

  1. Enter a value in From — millimeters are already selected.
  2. The result in inches appears instantly. Change either unit to convert to anything else in length.
  3. Use the swap button for the reverse conversion, and set the decimal places you need.
  4. Turn on Show formula to see the calculation, then copy or share the result.

Example

1 mm to in

Millimeter
1 mm
Inch
in = 1 ÷ 25.4 = 0.03937 in

Common use cases

  • Converting heights, room dimensions and furniture sizes between metric and imperial.
  • Running, cycling and driving distances in km and miles.
  • Engineering drawings and 3D printing that mix millimeters and inches.

Millimeters to Inches conversion table

millimeters to inches
Millimeter (mm)Inch (in)
0.1 mm0.003937 in
0.5 mm0.019685 in
1 mm0.03937 in
2 mm0.07874 in
3 mm0.11811 in
4 mm0.15748 in
5 mm0.19685 in
10 mm0.393701 in
15 mm0.590551 in
millimeters to inches (continued)
Millimeter (mm)Inch (in)
20 mm0.787402 in
25 mm0.984252 in
50 mm1.968504 in
75 mm2.952756 in
100 mm3.937008 in
250 mm9.84252 in
500 mm19.685039 in
1,000 mm39.370079 in

Values rounded to 6 decimal places.

Related conversions

The units

Millimeter (mm)
1/1000 m. Part of the Metric system.
Inch (in)
Exactly 2.54 cm. Part of the US customary system.

How to convert millimeters to inches

Engineering, 3D printing and woodworking often mix millimeters with fractional inches such as 1/8″ (3.175 mm).

To convert millimeters to inches, use in = mm ÷ 25.4. One millimeter equals 0.03937 inches, and one inch equals 25.4 millimeters.

Millimeter (mm): 1/1000 m. Inch (in): Exactly 2.54 cm.

All length units are on the length converter.

Limitations

  • Results are rounded to the decimal places you choose; the calculation itself keeps full precision.

Frequently asked questions

How many inches are in a millimeter?

1 mm = 0.03937 in. Multiply millimeters by 0.03937007874 (or use in = mm ÷ 25.4).

How do I convert millimeters to inches?

Use in = mm ÷ 25.4. For example, 1 mm = 0.0394 in and 10 mm = 0.3937 in.

How many feet are in a meter?

1 meter = 3.28084 feet (exactly 1 ÷ 0.3048). One foot is exactly 0.3048 m.

Is a mile the same as a nautical mile?

No. A statute mile is 1,609.344 m; a nautical mile is 1,852 m — about 15% longer.