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Convert mm to inches

1 millimeter equals 0.0393701 inches. To convert millimeters to inches, divide the number of millimeters by 25.4: for example, 10 mm is 0.393701 in. Ethical Tube's free mm to inches converter does the math as you type, and the chart below lists common values.

1 mm = 0.0393701 in

1 mm
0.0393701 in
1 in
25.4 mm
Formula
in = mm × 0.0393701
Measures
Length
Price
Free
Works offline
Yes

Conversion chart

mm to inches chart

Millimeters (mm)Inches (in)
1 mm0.0393701 in
2 mm0.0787402 in
3 mm0.11811 in
4 mm0.15748 in
5 mm0.19685 in
6 mm0.23622 in
8 mm0.314961 in
10 mm0.393701 in
12 mm0.472441 in
15 mm0.590551 in
20 mm0.787402 in
25 mm0.984252 in
50 mm1.9685 in
100 mm3.93701 in

How it works

How to convert mm to inches

  1. Know the formula

    in = mm × 0.0393701. In words: divide the number of millimeters by 25.4.

  2. Work an example

    10 mm → 0.393701 in. Round to two or three decimal places for everyday use.

  3. Or type it in

    Enter any value in the converter above and the answer appears instantly, in both directions.

Good to know

About length units

  • Since 1959, one inch is defined as exactly 2.54 centimeters, so conversions between metric and US lengths are exact.
  • A foot is 12 inches, a yard is 3 feet, and a mile is 5,280 feet.

FAQ

Questions, answered

How many inches are in a millimeter?

There are 0.0393701 inches in 1 millimeter. To convert millimeters to inches, divide the number of millimeters by 25.4.

What is 10 mm in inches?

10 millimeters is 0.393701 inches.

How do you convert inches back to mm?

Multiply the number of inches by 25.4. 1 inch is 25.4 millimeters.

Is this mm to inches converter free?

Yes. It's free and works in any browser, even offline once the page has loaded. The answer updates as you type, and nothing you enter is sent anywhere.

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