Span. 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 span (The American System (US Customary Units) and British Imperial Measures). 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 (span). Then click the Convert Me button.
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3Now find the unit you want and get the conversion result next to it. It's your answer.

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Conversion settings explained

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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 (span):
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Metric

span to kilometer (km)
span to meter (m)
span to decimeter (dm)
span to centimeter (cm)
span to millimeter (mm)
span to micrometre (micron)
span to nanometer (nm)
span 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.

span to league
span to mile (mi)
span to land
span to furlong
span to bolt
span to chain
span to pole
span to rod (rd)
span to perch
span to yard (yd)
span to feet and inches (x'y")
span to hand
span to inch (in)
span to line
span to mil
span to microinch
Units: league  / mile (mi)  / land  / furlong  / bolt  / chain  / pole  / rod (rd)  / perch  / yard (yd)  / foot (ft)  / feet and inches (x'y")  /  / 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.
span to league
span to mile (mi)
span to land
span to skein
span to bolt
span to shackle
span to furlong
span to chain
span to rope
span to pole
span to goad
span to ell
span to yard (yd)
span to pace
span to cubit (cu)
span to foot (ft)
span to span (sp)
span to nail
span to shaftment
span to hand (hd)
span to palm (plm)
span to inch (in)
span to finger
span to digit
span to barleycorn
span to poppyseed
span to line
span to button
span to caliber
span to thou (th)
span 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

span to furlong
span to Ramsden's (engineers') chain (ch)
span to Gunter's (surveyors') chain (ch)
span to Gurley's chain (ch)
span to Gunter's (surveyors') pole
span to Gunter's (surveyors') yard
span 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.
span to nautical league (naut.leag)
span to nautical mile (naut.mi)
span to cable length (cbl)
span 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.
span to US nautical mile
span 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.
span to Admiralty mile
span 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.
span to cuadra of Argentina
span to cuadra of Bolivia
span to cuadra of Chile
span to cuadra of Colombia
span to cuadra of Ecuador
span to cuadra of Nicaragua
span to cuadra of Paraguay
span to cuadra of Uruguay
span to vara of Argentina
span to vara of Brazil
span to vara of Chile
span to vara of Colombia
span to vara of Costa Rica
span to vara of Cuba
span to vara of Dominican Republic
span to vara of Ecuador
span to vara of El Salvador
span to vara of Guatemala
span to vara of Honduras
span to vara of Mexico
span to vara of Nicaragua
span to vara of Panama
span to vara of Paraguay
span to vara of Peru (peruana)
span to vara of Peru (española)
span to vara of Uruguay
span to vara of São Tomé and Principe
span 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

span to ri (里)
span to cho (町)
span to jo (丈)
span to hiro (尋)
span to ken (間)
span to shaku (尺)
span to sun (寸)
span to bu (分)
span to rin (厘)
span 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)
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» hide »

Chinese units of 1930

span to li (市里)
span to yin (引)
span to zhang (市丈)
span to chi (市尺)
span to cun (市寸)
span to fen (市分)
span to li (釐 or 厘)
span to hao (毫)
span to si (丝)
span 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)
» show »
» hide »

Chinese units of 1915

span to li (里)
span to yin (引)
span to zhang (丈)
span to bu (步)
span to chi (尺)
span to cun (寸)
span to fen (分)
span to li (釐 or 厘)
span to hao (毫)
span to si (丝)
span 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)
» show »
» hide »

Hong Kong units

span to cek (尺)
span to tsun (寸)
span 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.
span to yot (โยชน์, league)
span to sen (เส้น, rope)
span to wa (วา, fathom)
span to sok (ศอก, cubit)
span to khuep (คืบ, span)
span to nio (นิ้ว, finger)
span 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)
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» hide »

Optical

span to dioptre (diopter)
Units: dioptre (diopter)
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» hide »

Geographical (German)

span to geographical mile
Units: geographical mile
» show »
» hide »

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.
span to rack unit (U)
span to horizontal pitch (HP)
Units: rack unit (U)  / horizontal pitch (HP)
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Typographical (British and U.S. - ATA system)

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

Typographical (Europe - Didot system)

span to cicero
span to point (pt)
Units: cicero  / point (pt)
» show »
» hide »

European footwear unit

span to Paris point
Units: Paris point
» show »
» hide »

Astronomical

span to red shift (z)
span to parsec (pc)
span to light year
span to astronomical unit (au)
span to light minute
span to light second
Units: red shift (z)  / parsec (pc)  / light year  / astronomical unit (au)  / light minute  / light second
» show »
» hide »

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.
span to light microsecond
span to light nanosecond
span to light picosecond
Units: light microsecond  / light nanosecond  / light picosecond
» show »
» hide »

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.
span to Planck length (L)
Units: Planck length (L)

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