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Convert mm to inches (Millimeters to Inches)

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

Converter

millimeter (mm)
inch (in)

mm to in conversion table

MillimetersInches
1 mm0.039370079 in
2 mm0.078740157 in
5 mm0.19685039 in
10 mm0.39370079 in
25 mm0.98425197 in
50 mm1.9685039 in
100 mm3.9370079 in
1000 mm39.370079 in

Formula

in = mm × 0.03937007874

Worked example

25 mm × 0.03937007874 = 0.9842519685 in

Popular mm to in conversions

Quick answers for common values, each with its own formula and worked steps.

  • 1 mm to inches

    1 mm = 0.0393701 in. Formula, working and reverse conversion.

    convertly.website/1-mm-to-inches/
  • 2 mm to inches

    2 mm = 0.0787402 in. Formula, working and reverse conversion.

    convertly.website/2-mm-to-inches/
  • 5 mm to inches

    5 mm = 0.19685 in. Formula, working and reverse conversion.

    convertly.website/5-mm-to-inches/
  • 10 mm to inches

    10 mm = 0.393701 in. Formula, working and reverse conversion.

    convertly.website/10-mm-to-inches/
  • 20 mm to inches

    20 mm = 0.787402 in. Formula, working and reverse conversion.

    convertly.website/20-mm-to-inches/
  • 25 mm to inches

    25 mm = 0.984252 in. Formula, working and reverse conversion.

    convertly.website/25-mm-to-inches/
  • 50 mm to inches

    50 mm = 1.9685 in. Formula, working and reverse conversion.

    convertly.website/50-mm-to-inches/
  • 100 mm to inches

    100 mm = 3.93701 in. Formula, working and reverse conversion.

    convertly.website/100-mm-to-inches/
  • 500 mm to inches

    500 mm = 19.685 in. Formula, working and reverse conversion.

    convertly.website/500-mm-to-inches/
  • 1000 mm to inches

    1000 mm = 39.3701 in. Formula, working and reverse conversion.

    convertly.website/1000-mm-to-inches/

About millimeters and inches

Millimeter (mm)

A millimeter is one thousandth of a meter. It is used for small dimensions in engineering drawings, machining and product specifications.

Inch (in)

The inch is defined as exactly 25.4 millimeters, or 1/12 of a foot. It is used for screen sizes, tools, pipe and hardware sizes, and everyday lengths in the US and UK.

Both are units of length; the base unit used internally is m.

Notes

mm to in FAQs

How do I convert millimeters to inches?

Multiply the number of millimeters by 0.03937007874 to get inches. For example, 25 mm × 0.03937007874 = 0.984252 in.

How many inches are in one millimeter?

1 mm = 0.03937007874 in and 1 in = 25.4 mm. To go the other way, use the inches to millimeters converter.

How many inches are in 10 millimeters?

10 mm = 0.393701 in, rounded to 6 significant digits. Change the value in the converter above for any other amount.

How many inches are in 6 millimeters?

6 mm = 0.23622 in, rounded to 6 significant digits.

What is the formula for millimeters to inches?

in = mm × 0.03937007874, where mm is the number of millimeters and in is the result in inches. The reverse is mm = in × 25.4.

Is the mm to in conversion exact?

The ratio is exact by definition, but its decimal form does not end (0.0393700787402… to 12 significant digits). The converter keeps full precision internally and rounds only the displayed answer, which you can set from 4 to 12 significant digits.

What is the difference between millimeters and inches?

A millimeter is one thousandth of a meter. It is used for small dimensions in engineering drawings, machining and product specifications. The inch is defined as exactly 25.4 millimeters, or 1/12 of a foot. It is used for screen sizes, tools, pipe and hardware sizes, and everyday lengths in the US and UK.

Related converters

Reverse: Inches to millimeters.

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Guide

Read: Inch Fractions to mm Chart.

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