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Millimeters to Inches

Type a number in Millimeters and see it in Inches instantly. For screws, tools and parts. Shown as fractional inches too.

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Calculations run in this page only. Conversion factors follow official definitions.

How to use

  1. 1. Type a numberEnter a value in Millimeters in the top box.
  2. 2. See the answerThe answer in Inches appears right away. Type in the bottom box to convert back.
  3. 3. Use the chartA chart of common values appears on the right. You can print it.

Millimeters to Inches chart

mmin
10.0393701
20.0787402
30.11811
50.19685
60.23622
80.314961
100.393701
120.472441
150.590551
200.787402
250.984252
501.9685

Sources

Conversion factors follow official definitions such as the NIST conversion tables.

Sources: NIST Guide to the SI, Appendix B

FAQ

What is 1 mm in in?

1 mm = 0.0393700787 in.

How do I convert Millimeters to Inches?

Multiply the number of Millimeters by 0.0393700787. Formula: in = mm × 0.0393700787

How do I convert Inches back to Millimeters?

Divide by 0.0393700787 (or multiply by 25.4). Press Swap to convert the other way.

How many in is 10 mm?

10 mm is 0.393701 in. The table below lists more values.

How many in is 25 mm?

25 mm is 0.984252 in. The table below lists more values.

Is my data sent anywhere?

No. The conversion happens in your browser.

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