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Convert Millimeter to Inch

Please provide values below to convert millimeter [mm] to inch [in], or vice versa.

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10 millimeters is about a London bus's length.

Millimeter

Definition: A millimeter is a unit of length in the International System of Units (SI), equal to 1/1000 of a meter.

History/origin: Like the centimeter, the millimeter is derived from the meter using a standard SI prefix — "milli" indicates a factor of one thousandth.

Current use: The millimeter is used for precision measurements in engineering, manufacturing, and everyday small-scale measurement worldwide.

Inch

Definition: An inch is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959.

History/origin: The term "inch" was derived from the Latin unit "uncia", which equated to "one-twelfth" of a Roman foot. There have been a number of historical definitions, including ones based on barleycorns and the width of a human thumb.

Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It's also used in relation to electronic parts, like the size of display screens, in many other countries.

Millimeter to Inch Conversion Table

Millimeter [mm]Inch [in]
1 mm0.03937 in
5 mm0.19685 in
10 mm0.393701 in
25 mm0.984252 in
50 mm1.968505 in
100 mm3.93701 in

How to Convert Millimeter to Inch

1 mm = 0.03937 in
1 in = 25.399986 mm

Example: convert 15 mm to in:
15 mm = 15 × 0.0393701 in = 0.590552 in

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