Convert inches to mm (2024)

Convert inches to mm (1)

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


Inch

Definition: An inch (symbol: in) 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. There are 12 inches in a foot and 36 inches in a yard.

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 different standards for the inch in the past, with the current definition being based on the international yard. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.

Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens.

Millimeter

Definition: A millimeter (symbol: mm) is a unit of length in the International System of Units (SI). It is defined in terms of the meter, as 1/1000 of a meter, or the distance traveled by light in 1/299 792 458 000 of a second.

History/origin: The milli- prefix is one of many metric prefixes. It indicates one thousandth of the base unit, in this case the meter. The definition of the meter has changed over time, the current definition being based on the distance traveled by the speed of light in a given amount of time. The relationship between the meter and the millimeter is constant however. Prior to this definition, the meter was based on the length of a prototype meter bar. In 2019, the meter has been re-defined based on the changes made to the definition of a second.

Inch to Millimeter Conversion Table

Inch [in]Millimeter [mm]
0.01 in0.254 mm
0.1 in2.54 mm
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
5 in127 mm
10 in254 mm
20 in508 mm
50 in1270 mm
100 in2540 mm
1000 in25400 mm

How to Convert Inch to Millimeter

1 in = 25.4 mm
1 mm = 0.0393700787 in

Example: convert 15 in to mm:
15 in = 15 × 25.4 mm = 381 mm

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Convert Inch to Other Length Units

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Inch to Nautical League (int.)

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Inch to Nautical Mile (international)

Inch to Mile (statute)

Inch to Mile (US Survey)

Inch to Mile (Roman)

Inch to Kiloyard

Inch to Furlong

Inch to Furlong (US Survey)

Inch to Chain

Inch to Chain (US Survey)

Inch to Rope

Inch to Rod

Inch to Rod (US Survey)

Inch to Perch

Inch to Pole

Inch to Fathom

Inch to Fathom (US Survey)

Inch to Ell

Inch to Foot (US Survey)

Inch to Link

Inch to Link (US Survey)

Inch to Cubit (UK)

Inch to Hand

Inch to Span (cloth)

Inch to Finger (cloth)

Inch to Nail (cloth)

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Inch to Barleycorn

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Inch to Microinch

Inch to Angstrom

Inch to A.u. Of Length

Inch to X-unit

Inch to Fermi

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Inch to Point

Inch to Twip

Inch to Aln

Inch to Famn

Inch to Caliber

Inch to Centiinch

Inch to Ken

Inch to Russian Archin

Inch to Roman Actus

Inch to Vara De Tarea

Inch to Vara Conuquera

Inch to Vara Castellana

Inch to Cubit (Greek)

Inch to Long Reed

Inch to Reed

Inch to Long Cubit

Inch to Handbreadth

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Inch to Sun's Radius

Convert inches to mm (2024)

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