Convert Length and Distance Units Instantly

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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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

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

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Metric

kilometer (km)
meter (m)
decimeter (dm)
centimeter (cm)
millimeter (mm)
micrometre (micron)
nanometer (nm)
ångström
Units: kilometer (km)  / meter (m)  / decimeter (dm)  / centimeter (cm)  / millimeter (mm)  / micrometre (micron)  / nanometer (nm)  / ångström
» show »

The American System of Measures (US Customary Units)

American weight and measures are based on units used in Britain prior to 1824, when imperial system was officially established. The US law of 1866 set a relationship with the metric system by defining the meter as equal to 39.37 in. Since then all measures were redefined in terms of metric units with the last minimal adjustment in 1959. However the old standard of 1ft was retained with the name US survey foot.
league
mile (mi)
land
bolt
pole
rod (rd)
perch
yard (yd)
foot (ft)
feet and inches (x'y")
span
hand
inch (in)
line
mil
microinch
Units: league  / mile (mi)  / land  / bolt  / pole  / rod (rd)  / perch  / yard (yd)  / foot (ft)  / feet and inches (x'y")  / span  / hand  / inch (in)  / line  / mil  / microinch
» show »

British (Imperial) Measure

The first English official measurement standards were defined in 15th century. British system of units, known as imperial units, was established in 1824. Later in 1963 the standards were redefined in terms of metre stantard maintained in Paris. 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.
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
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
» show »

US Surveyors' Measure

furlong
Ramsden's (engineers') chain (ch)
Gunter's (surveyors') chain (ch)
Gurley's chain (ch)
Gunter's (surveyors') pole
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  / Ramsden's (engineers') link  / Gunter's (surveyors') link  / Gurley's link  / Gunter's (surveyors') foot (ft)
» show »

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.
nautical league (naut.leag)
nautical mile (naut.mi)
cable length (cbl)
fathom (fath)
Units: nautical league (naut.leag)  / nautical mile (naut.mi)  / cable length (cbl)  / fathom (fath)
» show »

US Nautical Measure

These measures were abandoned in favor of the international nautical measures in 1954.
US nautical mile
US cable length
US fathom (fath)
Units: US nautical mile  / US cable length  / US fathom (fath)
» show »

British (Imperial) Nautical Measure

These measures were abandoned in favor of the international nautical measures in 1970.
Admiralty mile
Admiralty cable length
Units: Admiralty mile  / Admiralty cable length
» show »

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.
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
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
» show »

Japanese

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

Chinese units of 1930

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)
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 »

Chinese units of 1915

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

Hong Kong units

cek (尺)
tsun (寸)
fan (分)
Units: cek (尺)  / tsun (寸)  / fan (分)
» show »

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.
yot (โยชน์, league)
sen (เส้น, rope)
wa (วา, fathom)
sok (ศอก, cubit)
khuep (คืบ, span)
nio (นิ้ว, finger)
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 »

Optical

dioptre (diopter)
Units: dioptre (diopter)
» show »

Geographical (German)

geographical mile
Units: geographical mile
» show »

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 (U)
horizontal pitch (HP)
Units: rack unit (U)  / horizontal pitch (HP)
» show »

Typographical (British and U.S. - ATA system)

pica
pica [PostScript]
point (pt)
point [PostScript] (pt)
pixel (px)
twip
Units: pica  / pica [PostScript]  / point (pt)  / point [PostScript] (pt)  / pixel (px)  / twip
» show »

Typographical (Europe - Didot system)

cicero
point (pt)
Units: cicero  / point (pt)
» show »

European footwear unit

Paris point
Units: Paris point
» show »

Astronomical

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

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 microsecond
light nanosecond
light picosecond
Units: light microsecond  / light nanosecond  / light picosecond
» show »

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

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