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Length Unit Converter

- By Dr. Minas E. Lemonis, PhD - Updated: April 14, 2019

Enter the distance or length and select the units to convert from and to:

FROM:
TO:
See also
Feet-metres converter
Inches-cm converter
Inches-mm converter
Miles-kilometres converter
Area converter
Volume converter
All Unit Converters

Characteristic lengths

Select a unit:
FieldObjectLength inRemarks
NatureMount Everest elevationinfo
Ocean's maximum known depthinfo
Earth's mean radiusinfo
Earth's equator lengthinfo
Longest river (Nile) lengthinfo
Deepest lake (Baikal) bottominfo
ConstructionLength of the Great Wall of Chinainfo
Longest bride span (Akashi Kaikyo)info
Tallest building (Burj Khalifa)info
Tallest dam (Jinping-I Dam)info
Longest railway line (Trans-Siberian)info
Longest metro system line length (Shangai)info
TechnologyLongest ship (Seawise Giant)info
Longest airplane (An-225 Mriya)info
International Space Station widthinfo
Highest rocket (Saturn V)info
Longest haul truck (BelAZ 75710)info
Semiconductor feature size (2015)info
SpaceMoon-earth average distanceinfo
Sun earth mean distanceinfo
Sun diameter (equatorial)info
Largest known star diameter (UY Scuti)info
Solar system radius (up to Kuiper belt)info
Distance to Alpha Centauri (closest star)info
Milkyway size (our galaxy)info
Largest known galaxy size (IC 1101)info
Observable universe diameterinfo
PhysicsProton charge radiusinfo
Hydrogen atom radius (empirical)info
Gamma rays wavelengthinfo
Visible light shortest wavelength (violet)info
Visible light longest wavelength (red)info
VHF wavelength (upper)info
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Convert to all other units

Enter a value to thelength field above, in order to see the results in this table.

SystemConvert to:Result
SINanometers [nm]
Micrometers [μm]
Millimeters [mm]
Centimeters [cm]
Meters [m]
Kilometers [km]
ImperialMils [mil]
Inches [in]
Feet [ft]
Yards [yd]
Miles [mi]
Nautical Miles [NM]
AstronomicalParsecs [pc]
Astronomical units [au]
Light seconds [ls]
Light years [ly]
HistoricalLeagues (land) [leag]
Leagues (nautical) [naut. league(s)]
Metric leagues [metric league(s)]
Russian versts [verst(s)]
Roman Stadiums [stadium(s)]
Greek Stadia [stadia]
See also
Feet-metres converter
Inches-cm converter
Inches-mm converter
Miles-kilometres converter
Area converter
Volume converter
All Unit Converters

Relationships between units of length

Select a unit:
SystemUnitLength inInfo
SI1 Nanometer [nm] =1 nm = 0.001 μm = 1x10-9 [more... ]
1 Micrometer [μm] =1 μm = 0.001 mm = 1x10-6 [more... ]
1 Millimeter [mm] =1 mm = 0.001 m [more... ]
1 Centimeter [cm] =1 cm = 10 mm = 0.01 m [more... ]
1 Meter [m] =1 m = the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second [more... ]
1 Kilometer [km] =1 km = 1000 m [more... ]
Imperial1 Mil [mil] =1 mil = 0.001 in = 0.0254 mm [more... ]
1 Inch [in] =1 inch = 25.4 mm = 0.0254 m [more... ]
1 Foot [ft] =1 feet = 12 inches = 0.3048 m [more... ]
1 Yard [yd] =1 yard = 3 feet = 36 inches = 0.9144 m [more... ]
1 Mile [mi] =1 mile = 1760 yards = 5280 feet = 1609.344 m [more... ]
1 Nautical Mile [NM] =1 nautical mile = 6076 feet = 1852 m [more... ]
Astronomical1 Parsec [pc] =1 parsec = 3.0857x1016 m = 3.26156 light years [more... ]
1 Astronomical unit [au] =1 au = 149 597 870.7 km roughly the earth-sun distance [more... ]
1 Light second [ls] =1 light second = 299792458 m ≈ 186280 mi [more... ]
1 Light year [ly] =1 light year = 0.3066 parsecs = 9.4607x1015 m [more... ]
Historical1 League (land) [leag] =1 league = 3 miles = 4828.032 m [more... ]
1 League (nautical) [naut. league(s)] =1 nautical league = 3 naut. miles = 5556 m [more... ]
1 Metric league [metric league(s)] =1 metric league = 2.4855 miles = 4000 m [more... ]
1 Russian verst [verst(s)] =1 verst = 0.6629 miles = 1066.8 m [more... ]
1 Roman Stadium [stadium(s)] =1 stadium = 184.9m = 600 Greek (attic) feet [more... ]
1 Greek Stadion [stadia] =1 stadion = 600 Greek feet = 157.7 m on average [more... ]
See also
Feet-metres converter
Inches-cm converter
Inches-mm converter
Miles-kilometres converter
Area converter
Volume converter
All Unit Converters