# Inch

**ininchesinternational inchin.Scottish inch3a quarter of a decimetreEnglishfractional inchin 2**

The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement.wikipedia

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### System of measurement

**system of unitssystems of measurementmeasurement system**

The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement.

Historically a wide range of units was used for the same type of quantity: in different contexts, length was measured in inches, feet, yards, fathoms, rods, chains, furlongs, miles, nautical miles, stadia, leagues, with conversion factors which were not powers of ten.

### Prime (symbol)

**prime symbolprimeprime mark**

The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement.

The double prime represents inches (in) and arcseconds (arcsec).

### Foot (unit)

**feetftfoot**

It is equal to 1⁄36 yard or 1⁄12 of a foot.

In both systems, the foot comprises 12 inches and three feet compose a yard.

### Unit of measurement

**unitunits of measurementunits**

The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement.

For example an inch could be defined in terms of a barleycorn.

### Uncia (unit)

**unciaOunceRoman uncia**

Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate similar units in other measurement systems, usually understood as deriving from the width of the human thumb.

It survived as the Byzantine liquid ounce (, oungía) and the origin of the English inch, ounce, and fluid ounce.

### Length

**widthbreadthlengths**

In U.S. customary units, English or Imperial system of units, commonly used units of length are the inch, the foot, the yard, and the mile.

### Thousandth of an inch

**milmilsthou**

10,000 tenths

Equal to 1⁄1000 of an inch, it is normally referred to as a thou, a thousandth, or (particularly in the United States) a mil.

### Dyadic rational

**dyadic fractiondyadic rational numberdyadic**

(This is akin to how the first and second "cuts" of the hour and degree are likewise indicated by prime and double prime symbols.) Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three eighths of an inch would be written as 2 3⁄8″ and not as 2.375″ nor as 2 6⁄16″.

The inch is customarily subdivided in dyadic rather than decimal fractions; similarly, the customary divisions of the gallon into half-gallons, quarts, and pints are dyadic.

### Ounce

**ozouncesoz.**

"Inch" is cognate with "ounce" (ynse), whose separate pronunciation and spelling reflect its reborrowing in Middle English from Anglo-Norman unce and ounce.

Inch comes from the same Latin word, but differs because it was borrowed into Old English and underwent i-mutation or umlaut and palatalization .

### Line (unit)

**linelinesmeasurement unit**

10, 12, 16, or 40 lines

The line (abbreviated L or l or ‴ or lin.) was a small English unit of length, variously reckoned as 1⁄10, 1⁄12, 1⁄16, or 1⁄40 of an inch.

### Pica (typography)

**picapicascomputer picas**

6 computer picas

The pica is a typographic unit of measure corresponding to approximately 1⁄6 of an inch, or 1⁄72 of a foot.

### Point (typography)

**pointpointsfont size**

72 PostScript points

The DTP point is defined as 1⁄72 of an international inch (about 0.353 mm) and, as with earlier American point sizes, is considered to be 1⁄12 of a pica.

### Barleycorn (unit)

**barleycornbarleycornsgrains of barley**

3 barleycorns

The barleycorn is a small English unit of length equal to 1⁄3 of an inch (i.e., close to 1/3 in) still used as the basis of shoe sizes in English-speaking countries.

### Hand (unit)

**handshandhands high**

1⁄4 or 0.25 hands

The adoption of the international inch in 1959 allowed for a standardized imperial form and a metric conversion.

### Centimetre

**cmcentimetercentimeters**

Standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s it has been based on the metric system and defined as exactly 2.54cm.

|= 0.393700787401574803149606299212598425196850 inches

### English units

**EnglishEnglish unitEnglish system**

An Anglo-Saxon unit of length was the barleycorn.

Inch : 3 barleycorns (the historical legal definition)

### Imperial units

**imperialimperial systemimperial unit**

The most commonly used units are the mile or "li", the yard or "ma", the foot or "chek", and the inch or "tsun".

### Japanese units of measurement

**Japanesechōri**

It is also used in Japan for electronic parts, especially display screens.

Feet and inches are used for most non-sport bicycles, whose tire sizes follow a British system; for sizes of magnetic tape and many pieces of computer hardware; for photograph sizes; and for the sizes of display screens for electronic devices.

### Palm (unit)

**palmpalmshandbreadth**

1⁄3 or 0.33 palms

The palm was divided into four digits (digitus) of about 1.85 cm or three inches (uncia) of about 2.47 cm. Three made a span (palmus maior or "greater palm") of about 22.2 cm; four, a Roman foot; five, a hand-and-a-foot (palmipes) of about 37 cm; six, a cubit (cubitus) of about 44.4 cm.

### Cubic inch

**CIDcu inc.i.d.**

Square inch, Cubic inch, and Metric inch

It is the volume of a cube with each of its three dimensions (length, width, and depth) being one inch long.

### Yard

**yardsReceiving yardsyd**

The yard (abbreviation: yd) is an English unit of length, in both the British imperial and US customary systems of measurement, that comprises 3 feet or 36 inches.

### United States customary units

**USUS customaryU.S. customary**

For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use.

### Pyramid inch

Pyramid inch

Supposedly it was one twenty-fifth of a "sacred cubit", 1.00106 imperial inches, or 2.5426924 centimetres.

### Scottish units

**ScottishScottish measuresBoll**

The now obsolete Scottish inch (òirleach), 1⁄12 of a Scottish foot, was about 1.0016 imperial inches (about 1.0016 in).

Scottish inch : As in England. A fraudulent smaller inch of 1⁄42 of an ell is also recorded.

### Square inch

**in 2 inches squarein²**

Square inch, Cubic inch, and Metric inch

A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch.