Convert Inch (in) to Millimeter (mm)

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What is Inch (in)?

An inch (symbol: in) is a unit of length in the British imperial and the United States customary systems of measurement. It is equal to exactly 25.4 mm.

History

The inch is derived from the Roman uncia ('twelfth'), representing one-twelfth of a foot. Various standards existed until the international yard and pound agreement of 1959 standardized it.

Current Use

Widely used in the United States, UK, and Canada for defining screen sizes, pipe diameters, and everyday measurements.

Inch (in) to Millimeter (mm) Conversion Table

Inch (in)Millimeter (mm)
0.01 in0.254 millimeter
0.1 in2.54 millimeter
1 in25.4 millimeter
2 in50.8 millimeter
3 in76.2 millimeter
4 in101.6 millimeter
5 in127 millimeter
10 in254 millimeter
20 in508 millimeter
50 in1270 millimeter
100 in2540 millimeter
1000 in25,400 millimeter