U - Rack Unit. Conversion Chart

This converter features contemporary units of length. There is also a special converter for historical units of length you might want to visit for ancient, medieval and other old units that are no longer used.
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1This is a conversion chart for rack unit (Computer Equipment). To switch the unit simply find the one you want on the page and click it.
You can also go to the universal conversion page.
2Enter the value you want to convert (rack unit). Then click the Convert Me button.
Your value gets instantly converted to all other units on the page.
3Now find the unit you want and get the conversion result next to it. It's your answer.

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  1. Enter the value of your unit .
  2. Touch "Convert Me" button.
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Conversion settings explained

First of all, you don't have to change any settings to use the converter. It's absolutely optional.

Number of significat figures

Do you want rounded off figures or scientifically precise ones? For everyday conversions we recommend choosing 3 or 4 significant digits. If you want maximum precision, set the number to 9

Digit groups separator

Choose how you want to have your digit groups separated in long numbers:

1234567.89none
1 234 567.89space
1,234,567.89comma
1.234.567,89point

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  • Significant figures:
  • Digit groups separator:
Your value (rack unit, U):
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Metric

rack unit to kilometer (km)
rack unit to meter (m)
rack unit to decimeter (dm)
rack unit to centimeter (cm)
rack unit to millimeter (mm)
rack unit to micrometre (micron)
rack unit to nanometer (nm)
rack unit to ångström
Units: kilometer (km)  / meter (m)  / decimeter (dm)  / centimeter (cm)  / millimeter (mm)  / micrometre (micron)  / nanometer (nm)  / ångström
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The American System (US Customary Units) and British Imperial Measures

American weights and measures are based on units used in Britain prior to 1826, when imperial system was officially established. Until 1960-1963 American and British units of length were different in 2 parts per million. In the middle of 20th century it started causing problems and the governments of the two countries agreed to refine the measures to exactly match. Since then Great Britain and the United States were using the same measures of length. In the U.S. the old standard of foot was retained with the name US survey foot.

From 1995 the UK adopted metric units for general use. The only imperial measures of length that can be officially used now are miles, yards, feet and inches for road traffic signs.

rack unit to league
rack unit to mile (mi)
rack unit to land
rack unit to furlong
rack unit to bolt
rack unit to chain
rack unit to pole
rack unit to rod (rd)
rack unit to perch
rack unit to yard (yd)
rack unit to feet and inches (x'y")
rack unit to span
rack unit to hand
rack unit to inch (in)
rack unit to line
rack unit to mil
rack unit to microinch
Units: league  / mile (mi)  / land  / furlong  / bolt  / chain  / pole  / rod (rd)  / perch  / yard (yd)  / foot (ft)  / feet and inches (x'y")  / span  / hand  / inch (in)  / line  / mil  / microinch
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British Imperial Measure before 1963

The first English official measurement standards were defined in 15th century. British system of units, known as imperial units, was established in 1824. The British Weights and Meausurements Act of 1824 repealed all existing British measures legislation and redefined existing units. The 1963 Weights and Measures Act standartized the international measures.
rack unit to league
rack unit to mile (mi)
rack unit to land
rack unit to skein
rack unit to bolt
rack unit to shackle
rack unit to furlong
rack unit to chain
rack unit to rope
rack unit to pole
rack unit to goad
rack unit to ell
rack unit to yard (yd)
rack unit to pace
rack unit to cubit (cu)
rack unit to foot (ft)
rack unit to span (sp)
rack unit to nail
rack unit to shaftment
rack unit to hand (hd)
rack unit to palm (plm)
rack unit to inch (in)
rack unit to finger
rack unit to digit
rack unit to barleycorn
rack unit to poppyseed
rack unit to line
rack unit to button
rack unit to caliber
rack unit to thou (th)
rack unit to mil
Units: league  / mile (mi)  / land  / skein  / bolt  / shackle  / furlong  / chain  / rope  / pole  / goad  / ell  / yard (yd)  / pace  / cubit (cu)  / foot (ft)  / span (sp)  / nail  / shaftment  / hand (hd)  / palm (plm)  / inch (in)  / finger  / digit  / barleycorn  / poppyseed  / line  / button  / caliber  / thou (th)  / mil
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US Surveyors' Measure

rack unit to furlong
rack unit to Ramsden's (engineers') chain (ch)
rack unit to Gunter's (surveyors') chain (ch)
rack unit to Gurley's chain (ch)
rack unit to Gunter's (surveyors') pole
rack unit to Gunter's (surveyors') yard
rack unit to Gunter's (surveyors') foot (ft)
Units: furlong  / Ramsden's (engineers') chain (ch)  / Gunter's (surveyors') chain (ch)  / Gurley's chain (ch)  / Gunter's (surveyors') pole  / Gunter's (surveyors') yard  / Ramsden's (engineers') link  / Gunter's (surveyors') link  / Gurley's link  / Gunter's (surveyors') foot (ft)
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International Nautical Measure

The international nautical mile was defined by the First International Extraordinary Hydrographic Conference, Monaco in 1929. This is the only definition in widespread current use, and is the one accepted by the International Bureau of Weights and Measures. Before 1929 different countries had different definitions, and the Soviet Union, the United Kingdom and the United States did not immediately accept the international value.
rack unit to nautical league (naut.leag)
rack unit to nautical mile (naut.mi)
rack unit to cable length (cbl)
rack unit to fathom (fath)
Units: nautical league (naut.leag)  / nautical mile (naut.mi)  / cable length (cbl)  / fathom (fath)
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US Nautical Measure

These measures were abandoned in favor of the international nautical measures in 1954.
rack unit to US nautical mile
rack unit to US fathom (fath)
Units: US nautical mile  / US cable length  / US fathom (fath)
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British (Imperial) Nautical Measure

These measures were abandoned in favor of the international nautical measures in 1970.
rack unit to Admiralty mile
rack unit to Admiralty cable length
Units: Admiralty mile  / Admiralty cable length
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Spanish Customary Units Still In Use Today

These units are still actively used in some countries of Latin America. Their values vary from country to country. You can find more old Spanish customary units on our historical lengths page.
rack unit to cuadra of Argentina
rack unit to cuadra of Bolivia
rack unit to cuadra of Chile
rack unit to cuadra of Colombia
rack unit to cuadra of Ecuador
rack unit to cuadra of Nicaragua
rack unit to cuadra of Paraguay
rack unit to cuadra of Uruguay
rack unit to vara of Argentina
rack unit to vara of Brazil
rack unit to vara of Chile
rack unit to vara of Colombia
rack unit to vara of Costa Rica
rack unit to vara of Cuba
rack unit to vara of Dominican Republic
rack unit to vara of Ecuador
rack unit to vara of El Salvador
rack unit to vara of Guatemala
rack unit to vara of Honduras
rack unit to vara of Mexico
rack unit to vara of Nicaragua
rack unit to vara of Panama
rack unit to vara of Paraguay
rack unit to vara of Peru (peruana)
rack unit to vara of Peru (española)
rack unit to vara of Uruguay
rack unit to vara of São Tomé and Principe
rack unit to vara of Venezuela
Units: cuadra of Argentina  / cuadra of Bolivia  / cuadra of Chile  / cuadra of Colombia  / cuadra of Ecuador  / cuadra of Nicaragua  / cuadra of Paraguay  / cuadra of Uruguay  / vara of Argentina  / vara of Brazil  / vara of Chile  / vara of Colombia  / vara of Costa Rica  / vara of Cuba  / vara of Dominican Republic  / vara of Ecuador  / vara of El Salvador  / vara of Guatemala  / vara of Honduras  / vara of Mexico  / vara of Nicaragua  / vara of Panama  / vara of Paraguay  / vara of Peru (peruana)  / vara of Peru (española)  / vara of Uruguay  / vara of São Tomé and Principe  / vara of Venezuela
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Japanese

rack unit to ri (里)
rack unit to cho (町)
rack unit to jo (丈)
rack unit to hiro (尋)
rack unit to ken (間)
rack unit to shaku (尺)
rack unit to sun (寸)
rack unit to bu (分)
rack unit to rin (厘)
rack unit to mo (毛, 毫)
Units: ri (里)  / cho (町)  / jo (丈)  / hiro (尋)  / ken (間)  / shaku (尺)  / sun (寸)  / bu (分)  / rin (厘)  / mo (毛, 毫)
» show »
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Chinese units of 1930

rack unit to li (市里)
rack unit to yin (引)
rack unit to zhang (市丈)
rack unit to chi (市尺)
rack unit to cun (市寸)
rack unit to fen (市分)
rack unit to li (釐 or 厘)
rack unit to hao (毫)
rack unit to si (丝)
rack unit to hu (忽)
Units: li (市里)  / yin (引)  / zhang (市丈)  / chi (市尺)  / cun (市寸)  / fen (市分)  / li (釐 or 厘)  / hao (毫)  / si (丝)  / hu (忽)
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Chinese units of 1915

rack unit to li (里)
rack unit to yin (引)
rack unit to zhang (丈)
rack unit to bu (步)
rack unit to chi (尺)
rack unit to cun (寸)
rack unit to fen (分)
rack unit to li (釐 or 厘)
rack unit to hao (毫)
rack unit to si (丝)
rack unit to hu (忽)
Units: li (里)  / yin (引)  / zhang (丈)  / bu (步)  / chi (尺)  / cun (寸)  / fen (分)  / li (釐 or 厘)  / hao (毫)  / si (丝)  / hu (忽)
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Hong Kong units

rack unit to cek (尺)
rack unit to tsun (寸)
rack unit to fan (分)
Units: cek (尺)  / tsun (寸)  / fan (分)
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Thai units

Some of these units are still in use even though metric system was formally established in 1923. Before the metrication the old units were standartied to exact metric values.
rack unit to yot (โยชน์, league)
rack unit to sen (เส้น, rope)
rack unit to wa (วา, fathom)
rack unit to sok (ศอก, cubit)
rack unit to khuep (คืบ, span)
rack unit to nio (นิ้ว, finger)
rack unit to krabiat (กระเบียด, quarter of a finger)
Units: yot (โยชน์, league)  / sen (เส้น, rope)  / wa (วา, fathom)  / sok (ศอก, cubit)  / khuep (คืบ, span)  / nio (นิ้ว, finger)  / krabiat (กระเบียด, quarter of a finger)
» show »
» hide »

Optical

rack unit to dioptre (diopter)
Units: dioptre (diopter)
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Geographical (German)

rack unit to geographical mile
Units: geographical mile
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Computer Equipment

A rack unit, U or RU is a unit of measure that describes the height of equipment designed to mount in a 19-inch rack or a 23-inch rack. The 19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the width of the equipment mounting frame in the rack including the frame; the width of the equipment that can be mounted inside the rack is less.
rack unit to horizontal pitch (HP)
Units:  / horizontal pitch (HP)
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Typographical (British and U.S. - ATA system)

rack unit to pica
rack unit to pica [PostScript]
rack unit to point (pt)
rack unit to point [PostScript] (pt)
rack unit to pixel (px)
rack unit to twip
Units: pica  / pica [PostScript]  / point (pt)  / point [PostScript] (pt)  / pixel (px)  / twip
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» hide »

Typographical (Europe - Didot system)

rack unit to cicero
rack unit to point (pt)
Units: cicero  / point (pt)
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» hide »

European footwear unit

rack unit to Paris point
Units: Paris point
» show »
» hide »

Astronomical

rack unit to red shift (z)
rack unit to parsec (pc)
rack unit to light year
rack unit to astronomical unit (au)
rack unit to light minute
rack unit to light second
Units: red shift (z)  / parsec (pc)  / light year  / astronomical unit (au)  / light minute  / light second
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Grace Hopper's units of distance

Grace Hopper is famous for her nanoseconds visual aid. People used to ask her why satellite communication took so long. She started handing out pieces of wire that were just under one foot long (11.80 inches) — the distance that light travels in one nanosecond. She also passed out packets of pepper, calling the individual grains of ground pepper picoseconds. She also used these aids to illustrate why computers had to be small to be fast.
rack unit to light microsecond
rack unit to light nanosecond
rack unit to light picosecond
Units: light microsecond  / light nanosecond  / light picosecond
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Natural units

In physics, natural units are physical units of measurement based only on universal physical constants. The origin of their definition comes only from properties of nature and not from any human construct.
rack unit to Planck length (L)
Units: Planck length (L)

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