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Millimeters to inches

Common for tools, drill bits, screws, jewelry and technical drawings that mix metric and imperial sizes.

0.03937007874

1 millimeter = 0.03937007874 inches

Formula: inches = millimeters ÷ 25.4

How to convert

How to convert millimeters to inches

One millimeter is 0.03937007874 inches. To convert, use this formula:

inches = millimeters ÷ 25.4

Example: 10 millimeters = 0.3937007874 inches.

Millimeters to inches table

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
7 mm0.275591 in
8 mm0.314961 in
9 mm0.354331 in
10 mm0.393701 in
15 mm0.590551 in
20 mm0.787402 in
25 mm0.984252 in
30 mm1.1811 in
40 mm1.5748 in
50 mm1.9685 in
75 mm2.95276 in
100 mm3.93701 in

About the units

  • A millimeter is one thousandth of a meter, the thickness of a credit card is just under one.
  • An inch is an imperial and US unit defined since 1959 as exactly 2.54 centimeters.

All length conversions

Related

More length conversions

  • Centimeters to inchesUseful for clothing sizes, screen sizes, paper and anything measured with a metric ruler that you know in inches.
  • Inches to centimetersHandy for screen and TV sizes, heights, waist sizes and product dimensions listed in inches.
  • Feet to metersUsed for heights, room sizes, building plans and altitudes quoted in feet.
  • Meters to feetUseful for converting heights, swimming pools, room dimensions and distances in metric countries.
  • Kilometers to milesFor running distances such as 5K and 10K races, road trips and speed limits abroad.
  • Miles to kilometersFor road signs, car mileage, flight distances and running plans written in miles.

Frequently asked questions

How many inches are in a millimeter?

One millimeter equals 0.03937007874 inches.

How do I convert millimeters to inches?

Use the formula inches = millimeters ÷ 25.4. For example, 10 millimeters is 0.3937007874 inches.

What is 10 millimeters in inches?

10 millimeters is 0.3937007874 inches.

How do I convert inches back to millimeters?

Use the formula millimeters = inches × 25.4. One inch is 25.4 millimeters.