au - Astronomical 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 astronomical unit (Astronomical). To switch the unit simply find the one you want on the page and click it.
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2Enter the value you want to convert (astronomical unit). Then click the Convert Me button.
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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 (astronomical unit, au):
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Metric

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

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

astronomical unit to furlong
astronomical unit to Ramsden's (engineers') chain (ch)
astronomical unit to Gunter's (surveyors') chain (ch)
astronomical unit to Gurley's chain (ch)
astronomical unit to Gunter's (surveyors') pole
astronomical unit to Gunter's (surveyors') yard
astronomical 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.
astronomical unit to nautical league (naut.leag)
astronomical unit to nautical mile (naut.mi)
astronomical unit to cable length (cbl)
astronomical 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.
astronomical unit to US nautical mile
astronomical 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.
astronomical unit to Admiralty mile
astronomical 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.
astronomical unit to cuadra of Argentina
astronomical unit to cuadra of Bolivia
astronomical unit to cuadra of Chile
astronomical unit to cuadra of Colombia
astronomical unit to cuadra of Ecuador
astronomical unit to cuadra of Nicaragua
astronomical unit to cuadra of Paraguay
astronomical unit to cuadra of Uruguay
astronomical unit to vara of Argentina
astronomical unit to vara of Brazil
astronomical unit to vara of Chile
astronomical unit to vara of Colombia
astronomical unit to vara of Costa Rica
astronomical unit to vara of Cuba
astronomical unit to vara of Dominican Republic
astronomical unit to vara of Ecuador
astronomical unit to vara of El Salvador
astronomical unit to vara of Guatemala
astronomical unit to vara of Honduras
astronomical unit to vara of Mexico
astronomical unit to vara of Nicaragua
astronomical unit to vara of Panama
astronomical unit to vara of Paraguay
astronomical unit to vara of Peru (peruana)
astronomical unit to vara of Peru (española)
astronomical unit to vara of Uruguay
astronomical unit to vara of São Tomé and Principe
astronomical 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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Chinese units of 1930

astronomical unit to li (市里)
astronomical unit to yin (引)
astronomical unit to zhang (市丈)
astronomical unit to chi (市尺)
astronomical unit to cun (市寸)
astronomical unit to fen (市分)
astronomical unit to li (釐 or 厘)
astronomical unit to hao (毫)
astronomical unit to si (丝)
astronomical 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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Hong Kong units

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

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

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

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

Typographical (Europe - Didot system)

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

European footwear unit

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

Astronomical

astronomical unit to red shift (z)
astronomical unit to parsec (pc)
astronomical unit to light year
astronomical unit to light minute
astronomical unit to light second
Units: red shift (z)  / parsec (pc)  / light year  /  / 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.
astronomical unit to light microsecond
astronomical unit to light nanosecond
astronomical unit to light picosecond
Units: light microsecond  / light nanosecond  / light picosecond
» show »
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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.
astronomical unit to Planck length (L)
Units: Planck length (L)

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