Length units converter
Length units converter - converts units between kilometers, meters, decimeters, angstroms, miles, feet, inches, american/imperial units, nautical (sea) units and astronomical units

Inputs data - value and unit, which we're going to convert#



SI (metric)#

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yottameterShow sourceYmYmYm1×10-24Derived length unit in SI system. One yottameter is equal to septylion of meters: 1 Ym=1024 m1\ Ym= 10^{24}\ m
zettameterShow sourceZmZmZm1×10-21Derived length unit in SI system. One zettameter is equal to sextillion of meters: 1 Zm=1021 m1\ Zm= 10^{21}\ m
exameterShow sourceEmEmEm1×10-18Derived length unit in SI system. One exameter is equal to quintillion of meters: 1 Em=1018 m1\ Em= 10^{18}\ m
petameterShow sourcePmPmPm1×10-15Derived length unit in SI system. One petameter is equal to quadrillion of meters: 1 Pm=1015 m1\ Pm= 10^{15}\ m
terameterShow sourceTmTmTm1×10-12Derived length unit in SI system. One terameter is equal to trillion of meters: 1 Tm=1012 m1\ Tm= 10^{12}\ m
gigameterShow sourceGmGmGm1×10-9Derived length unit in SI system. One gigameter is equal to billion of meters: 1 Gm=109 m1\ Gm= 10^{9}\ m
megameterShow sourceMmMmMm0.000001Derived length unit in SI system. One megameter is equal to million of meters: 1 Mm=1000000 m=106 m1\ Mm=1000000\ m= 10^{6}\ m
kilometerShow sourcekmkmkm0.001Derived length unit in SI system. One kilometer is equal to thausand of meters: 1 km=1000 m=103 m1\ km=1000\ m= 10^{3}\ m
hektometerShow sourcehmhmhm0.01Derived length unit in SI system. One hektometer is equal to hundred of meters: 1 hm=100 m=102 m1\ hm=100\ m= 10^{2}\ m
meterShow sourcemmm1The basic length unit in the SI system. 20.05.2019 the following meter definition was adopted: The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299792458 when expressed in the unit m⋅s−1, where the second is defined in terms of the caesium frequency ΔνCs..1 m=9192631770 c299792458 ΔνCs1\ m = \frac{9192631770\ c}{299792458\ \Delta \nu_{Cs}}
decimeterShow sourcedmdmdm10Derived length unit in SI system. One decimeter is equal to one tenth of meter: 1 dm=0.1 m=101 m1\ dm=0.1\ m= 10^{-1}\ m
centimeterShow sourcecmcmcm100Derived length unit in SI system. One centimeter is equal to one hundredth of meter: 1 cm=0.01 m=102 m1\ cm=0.01\ m= 10^{-2}\ m
milimeterShow sourcemmmmmm1000Derived length unit in SI system. One milimeter is equal to one thousandth of meter: 1 mm=0.001 m=103 m1\ mm=0.001\ m= 10^{-3}\ m
micrometre (micron)Show sourceμm\mu mµm1000000Derived length unit in SI system. One micrometre (micron) is equal to one millionth of meter: 1 μm=0.000001 m=106 m1\ \mu m=0.000001\ m= 10^{-6}\ m
nanometerShow sourcenmnmnm1000000000Derived length unit in SI system. One nanometer is equal to one billionth of meter: 1 nm=109 m1\ nm= 10^{-9}\ m
pikometerShow sourcepmpmpm1×1012Derived length unit in SI system. One pikometer is equal to one trillionth of meter: 1 pm=1012 m1\ pm= 10^{-12}\ m
femtometerShow sourcefmfmfm1×1015Derived length unit in SI system. One femtometer is equal to one quadrillionth of meter: 1 fm=1015 m1\ fm= 10^{-15}\ m
attometerShow sourceamamam1×1018Derived length unit in SI system. One attometer is equal to one quintillionth of meter: 1 am=1018 m1\ am= 10^{-18}\ m
zeptometerShow sourcezmzmzm1×1021Derived length unit in SI system. One zeptometer is equal to one sextillionth of meter: 1 zm=1021 m1\ zm= 10^{-21}\ m
yoctometerShow sourceymymym1×1024Derived length unit in SI system. One yoctometer is equal to one septillionth of meter: 1 ym=1024 m1\ ym= 10^{-24}\ m


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statute leagueShow source--0.000207124Imperial unit of length. Historically defined as the distance that can be walked on foot within one hour. One statute league corresponds to three imperial miles (3 mi).1 statute league=3 mi1\ \text {statute league} = 3\ mi
mileShow sourcemimimi0.000621371Imperial length unit. One mile is equal to 1760 yards or 5280 feet.1 mi=1760 yd=5280 ft1\ mi = 1760\ yd = 5280\ ft
furlongShow sourcefurfurfur0.00497097Historic length unit used in Anglo-Saxon countries. One furlong corresponds to one eighth of mile (1/8 mi).1 fu=18 mi1\ fu = \frac{1}{8}\ mi
surveyor's chainShow sourcechchch0.049709695A unit of length sometimes used in geodesy in Anglo-Saxon countries. One surveyor's chain corresponds to sixty six feet (66 ft). See foot unit for more.1 ch =66 ft1\ ch\ = 66\ ft
engineer's chainShow sourcechchch0.032808399A unit of length sometimes used in technical sciences in Anglo-Saxon countries. One engineer's chain corresponds to one hundred feet (100 ft). See foot unit for more.1 ch =100 ft1\ ch\ = 100\ ft
rodShow sourcerdrdrd0.198838782Historic length unit used in Anglo-Saxon countries. One rod corresponds to five and a half yards (5.5 yd). See the yard unit for more information.1 rd=512 yd1\ rd = 5 \frac{1}{2}\ yd
fathomShow sourcefmfmfm0.546806649Historic length unit. One fathom corresponded to the length of the arms of an adult male. In Great Britain it was used to measure sea depth on navigational charts. One British fathom is equivalent to six feet (6 ft).1 fm=6 ft1\ fm = 6\ ft
yardShow sourceydydyd1.093613298Unit of length used in Anglo-Saxon countries. One yard corresponds to three feet (3 ft). See unit rate for more information.1 yd=3 ft1\ yd = 3\ ft
footShow sourceftftft3.280839895Unit of length used in Anglo-Saxon countries. One foot corresponds to twelve inches (12 in). See the unit inch for more information.1 ft=12 in1\ ft = 12\ in
linkShow sourcelilili4.970969538Equivalent to one hundredth of a survey's chain.1 li=1100 ch1\ li = \frac{1}{100}\ ch
handShow source--13.440860215A unit of length used in Anglo-Saxon countries to measure the height of riding horses. One hand corresponds to the average width of a human hand, i.e. approx. 7.44 centimeters.1 hand=7.44 cm1\ \text{hand} = 7.44\ cm
inchShow sourceininin39.37007874An Anglo-Saxon unit of length defined historically as three times the average length of barley grain, i.e. about 2.54 centimeters.1 in=2.54 cm1\ in = 2.54\ cm
lineShow source--472.440944882An Anglo-Saxon unit of length used to determine the caliber of a weapon and historically to enter the dimensions of the buttons. One line corresponds to a tenth of an inch (0.1 in).1 line=110 in1\ \text{line} = \frac{1}{10}\ in


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parsecShow sourcepcpcpc3.240755744×10-17Distance unit used in astronomy. One parsec corresponds to the distance from which half of the great axis of the Earth's orbit is visible as an arc with a length of 1 arc second, which corresponds to about 3.2616 light years.1 pc=3.2616 ly1\ pc = 3.2616\ ly
light yearShow sourcelylyly1.056970722×10-16Distance unit used in astronomy. One light year corresponds to the distance that light travels in a vacuum in one year, i.e. about nine and a half trillion kilometers.1 ly=9.4607×1015 m1\ ly = 9.4607 \times 10^{15}\ m
light minuteShow source--5.559401735×10-11Distance unit used in astronomy. One light minute corresponds to the distance that light travels in a vacuum in one minute or sixty light seconds. See the light second unit for more information.1 lm=60 ls1\ lm = 60\ ls
light secondShow source--3.335640952×10-9Distance unit used in astronomy. One light second corresponds to the distance that light travels in a vacuum in one second, i.e. about three hundred million kilometers.1 ls=2.99792458×108m1\ ls = 2.99792458 \times 10^{8} m
astronomical unitShow sourceauauau6.684587154×10-12Distance unit used in astronomy. One astronomical unit corresponds to the average distance of the Earth from the Sun or about one hundred and fifty million kilometers.1 au=1.495978707×1011m1\ au = 1.495978707 \times 10^{11} m


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sea leagueShow source--0.000179986Historic unit of length. One sea league roughly corresponds to the sight range of a man who is 178 centimeters tall at sea level or three nautical miles (3 mi).1 sea league=3 mi=5.556 km1\ \text{sea league} = 3\ mi = 5.556\ km
sea mileShow sourcenminminmi0.000539957Junit of length used in maritime navigation and aviation. One nautical mile is equal to the length of the Earth's meridian arc, corresponding to one arc minute of a large circle.1 nmi=1852 m1\ nmi = 1852\ m
sea cabelShow source--0.005399568Equivalent to one-tenth of a nautical mile (1/10 mi). See nautical unit to learn more.1 sea cabel=110 mi1\ \text{sea cabel} = \frac{1}{10}\ mi
british cabelShow source--0.005396118Equivalent to a hundred fathoms (100 fm). See the fathom unit for more information.1 british cabel=100 fm1\ \text{british cabel} = 100\ fm
US cabelShow source--0.004556722Equivalent to a hundred twenty fathoms (120 fm). See the fathom unit for more information.1 US cabel=120 fm1\ \text{US cabel} = 120\ fm

Chemistry and atomic physics#

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angstromShow sourceA˚\text{Å}Å10000000000A unit of length used in chemistry and atomic physics. One angstrom has been chosen so that the distances on the atom scale, e.g. the length of bonds in atomic molecules, do not require the use of additional prefixes. The bond length in the hydrogen molecule is about 0.74 angstroms. One angstrom corresponds to one tenth of a nanometer (0.1 nm).1 A˚=110 nm=1010 m1\ \text{Å} = \frac{1}{10}\ nm = 10^{-10}\ m

What is "Length"?#

The word "length" has several meanings (ex. the length of a word). We will focus on length in physical meaning in this article.

The definition of length:
LENGTH is the physical measure of distance between two points (according to measurements in the Euclidian space - so linear). The distance itself can be measured as a straight line, but also as a length of a curve.

The meaning of "length" could be equal to one of the following:
  • distance - most common: description of how far apart objects are. In strictly physical meaning - the length of way the object moves (possibly not the shortest way connecting two points)
  • displacement - the length of shortest possible way connecting two points
  • height - mostly in a vertical size of an object (like how "tall" it is)
  • altitude - when talking about how far in the air the object is (ex. how high is the airplane)
  • depth
  • width
  • size
Typically the symbol of length is L or l. Base unit is 1 meter. Length cannot be negative.

Length is measure of one dimension. However there is also area for 2 dimensions (length squared) and volume for 3 dimensions.


The meter (also called metre) is the base unit of length in SI. It is defined as the distance travelled by light in vacuum during a time interval of 1/299.792.458 of a second. It has been defined on 17th General Conference on Weights and Measures in 1983.

After thousands of years of distance measurements, the thousands of units has been defined. The most known units we found are:
  • meter - and metric dependent units like kilometer, decimeter, centimeter, milimeter, micrometer, nanometer, angstrom etc. - the decimal multiples and submultiples of meter (so, thousands, milions... of meters) according to SI defined prefixes
  • mile, yard, foot, fathom, inch and less known league, furlong, chain, rod, link, hand, line - british (imperial) and american(US) units
  • parsec, astronomical unit - dedicated for astronomy
  • light year, light minute and light second - the distance travelled by light in vacuum during given unit of time (a year, minute, second etc.). These are really big lengths, so also used mainly for astronomical measurements.
  • sea league, sea mile, cabel (british or american) - are nautical (sea realated) units.

How to convert#

  • Enter the number to field "value" - enter the NUMBER only, no other words, symbols or unit names. You can use dot (.) or comma (,) to enter fractions.
    • 1000000
    • 123,23
    • 999.99999
  • Find and select your starting unit in field "unit". Some unit calculators have huge number of different units to select from - it's just how complicated our world is...
  • And... you got the result in the table below. You'll find several results for many different units - we show you all results we know at once. Just find the one you're looking for.

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