Light Second. 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 light second (Astronomical). To switch the unit simply find the one you want on the page and click it.
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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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Metric

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

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

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

light second to ri (里)
light second to cho (町)
light second to jo (丈)
light second to hiro (尋)
light second to ken (間)
light second to shaku (尺)
light second to sun (寸)
light second to bu (分)
light second to rin (厘)
light second 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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Chinese units of 1930

light second to li (市里)
light second to yin (引)
light second to zhang (市丈)
light second to chi (市尺)
light second to cun (市寸)
light second to fen (市分)
light second to li (釐 or 厘)
light second to hao (毫)
light second to si (丝)
light second 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

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

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

light second to dioptre (diopter)
Units: dioptre (diopter)
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Geographical (German)

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

light second to pica
light second to pica [PostScript]
light second to point (pt)
light second to point [PostScript] (pt)
light second to pixel (px)
light second to twip
Units: pica  / pica [PostScript]  / point (pt)  / point [PostScript] (pt)  / pixel (px)  / twip
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Typographical (Europe - Didot system)

light second to cicero
light second to point (pt)
Units: cicero  / point (pt)
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European footwear unit

light second to Paris point
Units: Paris point
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Astronomical

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

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