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The following are examples oforders of magnitude for differentlengths.

To help compare different orders of magnitude, the following list describes various lengths between${\displaystyle 1.6\times {10}^{-35}}$ meters and${\displaystyle {10}^{{10}^{{10}^{122}}}}$meters.

Factor (m)	Multiple	Value	Item
107	10 Mm	12.756 Mm	Equatorial diameter of Earth
		20.004 Mm	Length of ameridian on Earth (distance between Earth's poles along the surface)[37]
		40.075 Mm	Length of Earth'sequator
108	100 Mm	142.984 Mm	Diameter ofJupiter
		299.792 Mm	Distance traveled by light in vacuum in one second (alight-second, exactly 299,792,458 m by definition of thespeed of light)
		384.4 Mm	Moon's orbital distance from Earth
109	1 gigameter (Gm)	1.39 Gm	Diameter of theSun
		5.15 Gm	Greatest mileage ever recorded by a car (3.2 million miles by a 1966Volvo P-1800S)[38]
1010	10 Gm	18 Gm	Approximately onelight-minute
1011	100 Gm	150 Gm	1astronomical unit (au); mean distance between Earth and Sun
1012	1 terameter (Tm)	1.3 Tm	Optical diameter ofBetelgeuse
		1.4 Tm	Orbital distance ofSaturn from Sun
		2 Tm	Estimated optical diameter ofVY Canis Majoris, one of thelargest-known stars
		5.9 Tm	Orbital distance of Pluto from the Sun
		~ 7.5 Tm	Outer boundary of theKuiper belt
1013	10 Tm		Diameter of theSolar System as a whole[1]
		16.09 Tm	Total length of DNA molecules in all cells of an adult human body[39]
		21.49 Tm	Distance of theVoyager 1 spacecraft from Sun (as of Oct 2018[update]), the farthest man-made object so far[40]
		62.03 Tm	Estimated radius of theevent horizon of thesupermassive black hole inNGC 4889, the largest-knownblack hole to date
1014	100 Tm	180 Tm	Size of thedebris disk around the star51 Pegasi[41]
1015	1 petameter (Pm)	~7.5 Pm	Supposed outer boundary of theOort cloud (~ 50,000 au)
		9.461 Pm	Distance traveled by light in vacuum in one year; at its current speed,Voyager 1 would need 17,500 years to travel this distance
1016	10 Pm	30.857 Pm	1parsec
		39.9 Pm	Distance to nearest star (Proxima Centauri)
		41.3 Pm	As of March 2013, distance to nearest discoveredextrasolar planet (Alpha Centauri Bc)
1017	100 Pm	193 Pm	As of October 2010, distance to nearest discovered extrasolar planet with potential to support life as presently defined by science (Gliese 581 d)
		615 Pm	Approximate radius of humanity's radio bubble, caused by high-power TV broadcasts leaking through the atmosphere into outer space
1018	1 exameter (Em)	1.9 Em	Distance to nearbysolar twin (HIP 56948), a star with properties virtually identical to the Sun[42]
1019	10 Em	9.46 Em	Average thickness ofMilky Way Galaxy[43] (1,000 to 3,000 ly by21 cm observations[44])
1020	100 Em	113.5 Em	Thickness ofMilky Way Galaxy's gaseous disk[45]
1021	1 zettameter (Zm)
		1.54 Zm	Distance toSN 1987A, the most recent naked eye supernova
		1.62 Zm	Distance to theLarge Magellanic Cloud (adwarf galaxyorbiting theMilky Way)
		1.66 Zm	Distance to theSmall Magellanic Cloud (another dwarf galaxy orbiting the Milky Way)
		1.9 Zm	Diameter of galactic disk ofMilky Way Galaxy[46][47][48][49]
		6.15 Zm	Diameter of the low surface brightness disc halo of the giant spiral galaxyMalin 1
1022	10 Zm	13.25 Zm	Radius of the diffuse stellar halo ofIC 1101, one of the largest-known galaxies
		24 Zm	Distance toAndromeda Galaxy
		30.857 Zm	1megaparsec
		50 Zm	Diameter ofLocal Group ofgalaxies
1023	100 Zm	300–600 Zm	Distance toVirgo cluster ofgalaxies
1024	1 yottameter (Ym)	2.19 Ym	Diameter of theLocal Supercluster and the largest voids and filaments
		2.8 Ym	End of Greatness
		~5 Ym	Diameter of theHorologium Supercluster[50]
		9.461 Ym	Diameter of thePisces–Cetus Supercluster Complex, the supercluster complex which includes Earth
1025	10 Ym	13 Ym	Length of theSloan Great Wall, a giant wall of galaxies (galactic filament)[51]
		30.857 Ym	1gigaparsec
		37.84 Ym	Length of theHuge-LQG, a group of 73quasars
1026	100 Ym	95 Ym	Estimatedlight travel distance to certainquasars. Length of theHercules–Corona Borealis Great Wall, a colossal wall of galaxies, the largest and the most massive structure in the observable universe as of 2014
		127 Ym	Estimated light travel distance toGN-z11, themost distant object ever observed
		870 Ym	Approximate diameter (comoving distance) of thevisible universe[1]
1027	1 Rm	1.2 Rm	Lower bound of the (possibly infinite) radius of the universe, if it is a3-sphere, according to one estimate using theWMAP data at 95% confidence[52] It equivalently implies that there are at minimum 21particle horizon-sized volumes in the universe.
${\displaystyle {10}^{{10}^{115}}}$[note 3]	${\displaystyle {10}^{{10}^{115}}}$ m	${\displaystyle {10}^{{10}^{115}}}$ m	According to the laws of probability, the distance one must travel until one encounters a volume of space identical to ourobservable universe with conditions identical to our own.[53]
${\displaystyle {10}^{{10}^{{10}^{122}}}}$	${\displaystyle {10}^{{10}^{{10}^{122}}}}$ m	${\displaystyle {10}^{{10}^{{10}^{122}}}}$ m	Maximum size of universe aftercosmological inflation, implied by one resolution of theNo-Boundary Proposal[54]

Thequectometre (SI symbol:qm) is aunit oflength in themetric system equal to10⁻³⁰ metres. To help compare differentorders of magnitude, this section listslengths shorter than 10⁻³⁰m (1 qm).

• 1.6 × 10⁻⁵ quectometers (1.6 × 10⁻³⁵ meters) – thePlanck length (Measures of distance shorter than this do not make physical sense, according to current theories ofphysics.)
• 1 qm – 1 quectometer, the smallest named subdivision of the meter in theSI base unit of length, one nonillionth of a meter.^[55]

Therontometre (SI symbol:rm) is aunit oflength in themetric system equal to10⁻²⁷ metres.

• 1 rm – 1 rontometer, a subdivision of the meter in theSI base unit of length, one octillionth of a meter.^[55]

• 10 rm – the length of one side of a square whose area is oneshed, a unit oftarget cross section used innuclear physics

Theyoctometre (SI symbol:ym) is aunit oflength in themetric system equal to10⁻²⁴ metres.

• 2 ym – the effective cross-section radius of 1 MeVneutrinos as measured byClyde Cowan andFrederick Reines.^[56]

Thezeptometre (SI symbol:zm) is aunit oflength in themetric system equal to10⁻²¹ metres. To help compare differentorders of magnitude, this section listslengths between 10⁻²¹m and 10⁻²⁰ m (1 zm and 10 zm).

• 2 zm – the upper bound for the width of acosmic string in string theory.^{[citation needed]}
• 2 zm – radius of effectivecross section for a20GeVneutrino scattering off anucleon^[3]
• 7 zm – radius of effective cross section for a250^{[broken anchor]} GeV neutrino scattering off a nucleon^[3]

To help compare differentorders of magnitude, this section listslengths between 10⁻²⁰m and 10⁻¹⁹ m (10zm and 100 zm).

To help compare differentorders of magnitude, this section lists lengths between 10⁻¹⁹m and 10⁻¹⁸ m (100zm and 1am).

• 177 zm –de Broglie wavelength ofprotons at theLarge Hadron Collider (7 TeV as of 2010)^{[citation needed]}

Theattometre (SI symbol:am) is aunit oflength in themetric system equal to10⁻¹⁸ metres. To help compare differentorders of magnitude, this section listslengths between 10⁻¹⁸m and 10⁻¹⁷ m (1 am and 10 am).

• 1 am – sensitivity of theLIGO detector forgravitational waves^{[citation needed]}
• 1 am – upper limit for the size ofquarks andelectrons^{[citation needed]}

To help compare differentorders of magnitude, this section listslengths between 10⁻¹⁷m and 10⁻¹⁶ m (10am and 100 am).

• 10–100 am – range of the weak force^[57]
• 86 am – charge radius of aBottom eta meson^[58]

To help compare differentorders of magnitude, this section lists lengths between 10⁻¹⁶m and 10⁻¹⁵ m (100am and 1fm).

• 831 am – approximate proton radius^[59][60]

Thefemtometre (SI symbol:fm) is aunit oflength in themetric system equal to10⁻¹⁵ metres. Inparticle physics, this unit is sometimes called afermi, also with abbreviation "fm". To help compare differentorders of magnitude, this section listslengths between 10⁻¹⁵meters and 10⁻¹⁴ meters (1 femtometer and 10 fm).

• 1 fm – diameter of aneutron, approximate range-limit of thecolor force carried betweenquarks bygluons^[6][7]
• 1.5 fm – diameter of thescattering cross section of an 11MeVproton with a target proton^[8]
• 1.75 fm – the effective charge diameter of aproton^[61]
• 2.81794 fm –classical electron radius^[62]
• 3 fm – approximate range-limit of thenuclear binding force mediated bymesons^[6][7]
• 7 fm – the radius of the effective scattering cross section for a gold nucleus scattering a6^{[broken anchor]}MeValpha particle over 140 degrees^[8]

To help compare differentorders of magnitude, this section listslengths between 10⁻¹⁴m and 10⁻¹³ m (10fm and 100 fm).

• 1.75 to 15 fm – diameter range of theatomic nucleus^{[citation needed]}
• 10 fm – the length of one side of a square whose area is onebarn (10⁻²⁸ m²), a unit oftarget cross section used innuclear physics
• 30.8568 fm – 1 quectoparsec (10⁻³⁰parsecs)

To help compare differentorders of magnitude, this section lists lengths between 10⁻¹³m and 10⁻¹² m (100fm and 1pm).

• 570 fm – typical distance from the atomic nucleus of the two innermost electrons (electrons in the1s shell) in theuranium atom, the heaviest naturally-occurring atom

Thepicometre (SI symbol:pm) is aunit oflength in themetric system equal to10⁻¹² metres (⁠1/1000000000000⁠ m = 0.000000000001 m). To help compare differentorders of magnitude this section listslengths between 10⁻¹² and 10⁻¹¹ m (1 pm and 10 pm).

• 1 pm – distance betweenatomic nuclei in awhite dwarf^{[citation needed]}
• 1 pm – reference value of particle displacement in acoustics^[63]
• 2.4 pm – theCompton wavelength of anelectron
• 5 pm – shorterX-ray wavelengths (approx.)

To help compare differentorders of magnitude this section listslengths between 10⁻¹¹ and 10⁻¹⁰m (10 pm and 100 pm).

• 25 pm – approximate radius of a helium atom, the smallest neutral atom^[64][65]
• 30.8568 pm – 1 rontoparsec
• 50 pm – radius of a hydrogen atom
• 50 pm –bohr radius: approximate radius of a hydrogen atom
• ~50 pm – best resolution of ahigh-resolution transmission electron microscope
• 60 pm – radius of a carbon atom
• 93 pm – length of adiatomic carbon molecule
• 96 pm – H–O bond length in awater molecule

To help compare differentorders of magnitude this section listslengths between 10⁻¹⁰ and 10⁻⁹m (100 pm and 1 nm; 1 Å and 10 Å).

• 100 pm – 1ångström
• 100 pm –covalent radius ofsulfur atom^[66]
• 120 pm –van der Waals radius of a neutralhydrogen atom^[67]
• 120 pm – radius of a gold atom
• 126 pm – covalent radius ofruthenium atom
• 135 pm – covalent radius oftechnetium atom
• 150 pm – length of a typicalcovalent bond (C–C)
• 153 pm – covalent radius ofsilver atom
• 155 pm – covalent radius ofzirconium atom
• 175 pm – covalent radius ofthulium atom
• 200 pm – highest resolution of a typicalelectron microscope^[68]
• 225 pm – covalent radius ofcaesium atom
• 280 pm – average size of thewater molecule
• 298 pm – radius of acaesium atom,calculated to be the largest atomic radius
• 340 pm – thickness of single layergraphene
• 356.68 pm – width ofdiamondunit cell
• 403 pm – width oflithium fluoride unit cell
• 500 pm – Width ofproteinα helix
• 543 pm – silicon lattice spacing
• 560 pm – width ofsodium chloride unit cell
• 700 pm – width ofglucose molecule
• 700 pm – diameter of abuckyball^[69]
• 780 pm – mean width ofquartz unit cell
• 820 pm – mean width ofice unit cell
• 900 pm – mean width ofcoesite unit cell

Thenanometre (SI symbol:nm) is aunit oflength in themetric system equal to10⁻⁹ metres (⁠1/1000000000⁠ m = 0.000000001 m). To help compare differentorders of magnitude, this section lists lengths between 10⁻⁹ and 10⁻⁸ m (1 nm and 10 nm).

• 1 nm – diameter of acarbon nanotube
• 1 nm – roughly the length of asucrose molecule, calculated byAlbert Einstein
• 2.3 nm – length of aphospholipid
• 2.3 nm – smallestgate oxide thickness inmicroprocessors
• 3 nm – width of aDNA helix
• 3 nm –flying height of thehead of ahard disk
• 3 nm – theaverage half-pitch of a memory cell manufactured circa 2022
• 3.4 nm – length of a DNAturn (10bp)
• 3.8 nm – size of analbumin molecule
• 5 nm – size of the gate length of a 16 nm processor
• 5 nm – theaverage half-pitch of a memory cell manufactured circa 2019–2020
• 6 nm – length of aphospholipid bilayer
• 6–10 nm – thickness of cell membrane
• 6.8 nm – width of ahaemoglobin molecule
• 7 nm – diameter ofactin filaments
• 7 nm – theaverage half-pitch of a memory cell manufactured circa 2018
• 10 nm – thickness ofcell wall inGram-negativebacteria

To help compare differentorders of magnitude this section listslengths between 10⁻⁸ and 10⁻⁷m (10 nm and 100 nm).

• 10 nm Shortestextreme ultraviolet wavelength or longestX-ray wavelength^[71]
• 10 nm – the average length of ananowire
• 10 nm – lower size of tobacco smoke^[72]
• 10 nm – theaverage half-pitch of a memory cell manufactured circa 2016–2017
• 13 nm – the length of the wavelength that is used forEUV lithography
• 14 nm – length of aporcine circovirus
• 14 nm – theaverage half-pitch of a memory cell manufactured circa 2013
• 15 nm – length of an antibody
• 18 nm – diameter oftobacco mosaic virus^[73](Generally,viruses range in size from 20 nm to 450 nm.)^{[citation needed]}
• 20 nm – length of ananobe, could be one of the smallest forms of life
• 20–80 nm – thickness ofcell wall inGram-positive bacteria^[74]
• 20 nm – thickness ofbacterialflagellum^[75]
• 22 nm – theaverage half-pitch of a memory cell manufactured circa 2011–2012
• 22 nm – smallest feature size of productionmicroprocessors in September 2009^[76]
• 25 nm – diameter of amicrotubule
• 30 nm – lower size of cooking oil smoke
• 30.8568 nm – 1 yoctoparsec
• 32 nm – theaverage half-pitch of a memory cell manufactured circa 2009–2010
• 40 nm – extremeultraviolet wavelength
• 45 nm – theaverage half-pitch of a memory cell manufactured circa 2007–2008
• 50 nm – upper size for airbornevirus particles
• 50 nm –flying height of thehead of ahard disk^[77]
• 65 nm – theaverage half-pitch of a memory cell manufactured circa 2005–2006
• 58 nm – height of aT7 bacteriophage
• 90 nm –human immunodeficiency virus (HIV) (generally,viruses range in size from 20 nm to 450 nm)
• 90 nm – theaverage half-pitch of a memory cell manufactured circa 2002–2003
• 100 nm – Length of amesoporous silica nanoparticle

To help compare differentorders of magnitude, this section listslengths between 10⁻⁷ and 10⁻⁶m (100nm and 1 μm).

• 100 nm – greatest particle size that can fit through asurgical mask^[79]
• 100 nm – 90% of particles in woodsmoke are smaller than this.^{[citation needed]}
• 120 nm – greatest particle size that can fit through aULPA filter^[80]
• 120 nm – diameter of ahuman immunodeficiency virus (HIV)^[81]
• 120 nm – approximate diameter ofSARS-CoV-2^[82]
• 125 nm – standard depth of pits oncompact discs (width: 500 nm, length: 850 nm to 3.5 μm)
• 180 nm – typical length of therabies virus
• 200 nm – typical size of aMycoplasma bacterium, among the smallest bacteria
• 300 nm – greatest particle size that can fit through aHEPA (high efficiency particulate air) filter (N100 removes up to 99.97% at 300 nm, N95 removes up to 95% at 300 nm)^[83]
• 300–400 nm – nearultraviolet wavelength
• 400–420 nm – wavelength ofviolet light (seeColor andVisible spectrum)
• 420–440 nm – wavelength ofindigo light
• 440–500 nm – wavelength ofblue light
• 500–520 nm – wavelength ofcyan light
• 520–565 nm – wavelength ofgreen light
• 565–590 nm – wavelength ofyellow light
• 590–625 nm – wavelength oforange light
• 625–700 nm – wavelength ofred light
• 700–1.4 μm – wavelength ofnear-infrared radiation

Themicrometre (SI symbol:μm) is aunit oflength in themetric system equal to10⁻⁶ metres (⁠1/1000000⁠ m = 0.000001 m). To help compare differentorders of magnitude, this section lists some items with lengths between 10⁻⁶ and 10⁻⁵ m (between 1 and 10micrometers, or μm).

• ~0.7–300 μm – wavelength ofinfrared radiation
• 1 μm – the side of asquare of area10⁻¹² m²
• 1 μm – edge ofcube of volume10⁻¹⁸ m³ (1 fL)
• 1–10 μm – diameter of a typicalbacterium^{[citation needed]}
• 1 μm – length of alysosome
• 1–2 μm –anthrax spore^[84]
• 2 μm – length of an averageE. coli bacteria
• 3–4 μm – size of a typicalyeast cell^[85]
• 5 μm – length of a typical humanspermatozoon's head^[86]
• 6 μm – thickness of the tape in a 120-minute (C120)compact cassette^[87]
• 7 μm – diameter of thenucleus of a typical eukaryoticcell^{[citation needed]}
• about 7 μm – diameter of humanred blood cells^[88]
• 3–8 μm – width of strand ofspider web silk^[89]
• 5–10 μm – width of achloroplast^[90]
• 8–11 μm – size of a ground-level fog or mist droplet^{[91][note 4]}
• 7–12 μm – the diameter of humanwhite blood cells
• 8–10 μm – the diameter of humanmacrophages

To help compare differentorders of magnitude, this section listslengths between 10⁻⁵m and 10⁻⁴ m (10μm and 100 μm).

• 10 μm – width ofcotton fibre^[92]
• 10 μm –tolerance of aLego brick^[93]
• 10 μm –transistor width of theIntel 4004, the world's first commercialmicroprocessor
• 10 μm – mean longest dimension of a humanred blood cell^{[citation needed]}
• 5–20 μm –dust mite excreta^[94]
• 10.6 μm – wavelength of light emitted by acarbon dioxide laser
• 15 μm – width ofsilk fibre^{[citation needed]}
• 17 μm – minimum width of a strand of human hair^[25]
• 17.6 μm – onetwip, a unit of length in typography
• 10 to 55 μm – width ofwool fibre^[92]
• 25.4 μm – 1/1,000 inch, commonly referred to as 1mil in the U.S. and 1thou in the UK
• 30 μm – length of a humanskin cell
• 30.8568 μm – 1 zeptoparsec
• 50 μm – typical length ofEuglena gracilis, a flagellate protist^[95]
• 50 μm – typical length of a humanliver cell, an average-sized body cell^{[citation needed]}
• 50 μm – length of asilt particle
• 60 μm – length of asperm cell
• 78 μm — width of a pixel on the display of the iPhone 4, marketed asRetina Display^[96]
• 70 to 180 μm – thickness of paper

To help compare differentorders of magnitude, this section listslengths between 10⁻⁴m and 10⁻³ m (100 μm and 1 mm). The termmyriometer (abbr. mom, equivalent to 100 micrometers; frequently confused with themyriameter, 10 kilometers)^[97] is deprecated; the decimal metric prefixmyrio-^[98] is obsolete^{[99][100][101]} and was not included among theprefixes when theInternational System of Units was introduced in 1960.

• 100 μm – 1/10 of a millimeter
• 100 μm – 0.00394 inches
• 100 μm – smallest distance that can be seen with thenaked eye
• 100 μm – average diameter of a strand ofhuman hair^[25]
• 100 μm – thickness of a coat ofpaint
• 100 μm – length of adust particle
• 120 μm – thegeometric mean of thePlanck length and the diameter of theobservable universe:√8.8 × 10²⁶ m × 1.6 × 10⁻³⁵ m
• 120 μm – diameter of ahumanovum
• 170 μm – length of the largest mammaliansperm cell (rat)^[102]
• 170 μm – length of the largestsperm cell in nature, belonging to theDrosophila bifurca fruit fly^[103][104]
• 181 μm – maximum width of a strand of human hair^[25]
• 100–400 μm – length ofDemodex mites living in humanhair follicles
• 175–200 μm – typical thickness of asolar cell.
• 200 μm – typical length ofParamecium caudatum, a ciliate protist
• 200 μm – nominal width of the smallest commonly available mechanical pencil lead (0.2 mm)
• 250–300 μm – length of adust mite^[105]
• 340 μm – length of apixel on a 17-inch monitor with a resolution of 1024×768
• 500 μm – typical length ofAmoeba proteus, an amoeboid protist
• 500 μm –MEMS micro-engine^[106]
• 500 μm – average length of a grain ofsand
• 500 μm – average length of a grain ofsalt
• 500 μm – average length of a grain ofsugar
• 560 μm – thickness of the central area of a humancornea^[26]
• 750 μm – diameter of aThiomargarita namibiensis, the largest bacteria known^[107]
• 760 μm – thickness of anidentification card

Themillimetre (SI symbol:mm) is aunit oflength in themetric system equal to10⁻³ metres (⁠1/1000⁠ m = 0.001 m). To help compare differentorders of magnitude, this section lists lengths between 10⁻³ m and 10⁻² m (1 mm and 1 cm).

• 1.0 mm – 1/1,000 of a meter
• 1.0 mm – 0.03937inches or 5/127 (exactly)
• 1.0 mm – side of asquare of area1 mm²
• 1.0 mm – diameter of a pinhead
• 1.5 mm – average length of a flea^[27]
• 2.54 mm – distance between pins on olddual in-line package (DIP) electronic components
• 5 mm – length of an average red ant
• 5 mm – diameter of an average grain of rice
• 5.56×45mm NATO – standard ammunition size
• 6 mm – approximate width of a pencil
• 7 mm – length of aPaedophryne amauensis, the smallest-known vertebrate^[108]
• 7.1 mm – length of a sunflower seed
• 7.62×51mm NATO – common military ammunition size^[109]
• 8 mm – width of old-format home movie film
• 8 mm – length of aPaedocypris progenetica, the smallest-known fish^[110]

Thecentimetre (SI symbol:cm) is aunit oflength in themetric system equal to10⁻² metres (⁠1/100⁠ m = 0.01 m). To help compare differentorders of magnitude, this section lists lengths between 10⁻² m and 10⁻¹ m (1 cm and 1 dm).

• 1 cm – 10millimeters
• 1 cm – 0.39inches
• 1 cm – edge of asquare of area1 cm²
• 1 cm – edge of acube of volume1 mL
• 1 cm – length of a coffee bean
• 1 cm – approximate width of average fingernail
• 1.2 cm – length of a bee
• 1.2 cm – diameter of a die
• 1.5 cm – length of a very large mosquito
• 1.6 cm – length of a Jaragua Sphaero, a very small reptile
• 1.7 cm – length of a Thorius arboreus, the smallest salamander^[111]
• 2 cm – approximate width of an adult human finger
• 2.54 cm – 1 inch
• 3.08568 cm – 1attoparsec
• 3.4 cm – length of a quail egg^[112]
• 3.5 cm – width of film commonly used in motion pictures and still photography
• 3.78 cm – amount of distance the Moon moves away from Earth each year^[113]
• 4.3 cm – minimum diameter of a golf ball^[114]
• 5 cm – usual diameter of a chicken egg
• 5 cm – height of a hummingbird, the smallest-known bird
• 5.08 cm – 2inches,
• 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube
• 6.1 cm – average height of an apple
• 7.3–7.5 cm – diameter of a baseball^[28]
• 8.6 cm × 5.4 cm – dimensions of a standard credit card (also called CR80)^[115][116]
• 9 cm – length of a speckled padloper, the smallest-known turtle

Thedecimetre (SI symbol:dm) is aunit oflength in themetric system equal to10⁻¹ metres (⁠1/10⁠ m = 0.1 m). To help compare differentorders of magnitude, this section lists lengths between 10centimeters and 100 centimeters (10⁻¹ meter and 1 meter).

10 centimeters (abbreviated to 10 cm) is equal to:

• 1decimeter (dm), a term not in common use (1L = 1 dm³.)
• 100millimeters
• 3.9inches
• a side of asquare of area0.01 m²
• the edge of acube with a volume of1×10⁻³ m³ (1 L)

• 10 cm = 1.0 dm – wavelength of the highestUHF radio frequency,3 GHz
• 12 cm = 1.2 dm – wavelength of the2.45 GHz ISM radio band
• 21 cm = 2.1 dm – wavelength of the1.4 GHz hydrogen emission line, ahyperfine transition of the hydrogen atom
• 100 cm = 10 dm – wavelength of the lowest UHF radio frequency,300 MHz

• 10.16 cm = 1.016 dm – 1hand used in measuring height of horses (4 inches)
• 12 cm = 1.2 dm – diameter of a compact disc (CD) (= 120 mm)
• 15 cm = 1.5 dm – length of aBic pen with cap on
• 22 cm = 2.2 dm – diameter of a typical association football (soccer ball)
• 30 cm = 3 dm – typical school-use ruler length (= 300 mm)
• 30.48 cm = 3.048 dm – 1foot (measure)
• 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)
• 90 cm = 9 dm – average length of a rapier, a fencing sword^[30]
• 91.44 cm = 9.144 dm – oneyard (measure)

• 10 cm = 1 dm – diameter of the humancervix upon entering the second stage of labour
• 11 cm = 1.1 dm – length of an average potato in the US
• 13 cm = 1.3 dm – body length of aGoliath birdeater
• 15 cm = 1.5 dm – approximate size of largest beetle species
• 19 cm = 1.9 dm – length of a banana
• 26.3 cm = 2.6 dm – length of average male human foot
• 29.98 cm = 2.998 dm – distance light in vacuum travels in onenanosecond
• 30 cm = 3.0 dm – maximum leg length of a Goliath birdeater
• 31 cm = 3.1 dm – wingspan of largest butterfly speciesOrnithoptera alexandrae
• 32 cm – length of theGoliath frog, the world's largest frog
• 46 cm = 4.6 dm – length of an average domestic cat
• 50 to 65 cm = 5–6.5 dm – a coati's tail
• 66 cm = 6.6 dm – length of the longest pine cones (produced by the sugar pine^[117])

• 84 cm = 8.4 dm – approximate diameter of 2008 TS26, a meteoroid

To help compare differentorders of magnitude, this section lists lengths between onemeter and ten meters.Light, in vacuum, travels 1 meter in1⁄299,792,458, or 3.3356409519815E-9 of a second.

1meter is:

• 10decimeters
• 100centimeters
• 1,000millimeters
• 39.37inches
• 3.28feet
• 1.1yards
• side ofsquare with area1 m²
• edge ofcube with surface area6 m² and volume1 m³
• radius ofcircle with areaπ m²
• radius ofsphere with surface area4π m² and volume4/3π m³

• 1 m – approximate height of the top part of a doorknob on a door
• 1 m – diameter of a very largebeach ball
• 1.29 m – length of theCross Island Chapel, the smallest church in the world
• 1.4 m – length of aPeel P50, the world's smallest car
• 1.435 m – standard gauge of railway track used by about 60% of railways in the world = 4 ft 81⁄2 in
• 2.5 m – distance from the floor to the ceiling in an average residential house^[118]
• 2.7 m – length of theStarr Bumble Bee II, the smallest plane
• 2.77–3.44 m – wavelength of the broadcast radio FM band 87–108 MHz
• 3.05 m – the length of an oldMini
• 8 m – length of theTsar Bomba, the largest bomb ever detonated
• 8.38 m – the length of a London Bus (AEC Routemaster)

• 2.44 m – height of an association football goal^[119]
• 2.45 m – highest high jump by a human (Javier Sotomayor)^[120]
• 3.05 m – (10 feet) height of the basket in basketball
• 8.95 m – longest long jump by a human (Mike Powell)^[121]

• 1 m – length ofRafflesia arnoldii, the largest flower in the world
• 1 m – height ofHomo floresiensis (the "Hobbit")
• 1.15 m – apizote (mammal)
• 1.5 m – height of anokapi
• 1.63 m – (5 feet 4 inches) (or 64 inches) – height of average U.S. female human as of 2002^[update] (source: U.S. Centers for Disease Control and Prevention (CDC))
• 1.75 m – (5 feet 8 inches) – height of average U.S. male human as of 2002^[update] (source: U.S. CDC as per female above)
• 2.4 m – wingspan of amute swan
• 2.5 m – height of asunflower
• 2.7 m – length of aleatherback sea turtle, the largest living turtle
• 2.72 m – (8 feet 11 inches) – tallest-known human (Robert Wadlow)^[31]
• 3 m – length of agiant Gippsland earthworm
• 3 m – length of anKomodo dragon, the largest living lizard
• 3.63 m – the record wingspan for living birds (awandering albatross)
• 3.7 m – leg span of aJapanese spider crab
• 3.7 m – length of asouthern elephant seal, the largest living pinniped
• 5 m – length of anelephant
• 5.2 m – height of agiraffe^[122]
• 5.5 m – height of aBaluchitherium, the largest land mammal ever lived
• 6.5 m – wingspan ofArgentavis, the largest flying bird known
• 6.7 m – length of aMicrochaetus rappi
• 7.4 m – wingspan ofPelagornis, the bird with longest wingspan ever.^[123]
• 7.5 m – approximate length of the human gastrointestinal tract

• 3–6 m – approximate diameter of2003 SQ222, a meteoroid
• 4.1 m – diameter of2008 TC3, a small asteroid that flew into the Earth's atmosphere on 7 October 2008^[124]

Thedecametre (SI symbol:dam) is aunit oflength in themetric system equal to 10 meters (10¹ m). To help compare differentorders of magnitude, this section lists lengths between 10 and 100 meters.

10 meters (very rarely termed adecameter which is abbreviated as dam) is equal to:

• 10 meters
• 100decimeters
• 1,000centimeters
• 10,000millimeters
• 10,000,000micrometers (or rarely 10,000,000 microns)
• 32.8feet
• 11yards
• side of asquare with area100 m²

• 10 meters – wavelength of the highest shortwave radio frequency,30 MHz
• 10.2 meters – length of thePanzer VIII Maus, the world's largest tank
• 12 meters – height of theNewby-McMahon Building, the world's littlest skyscraper
• 23 meters – height ofLuxor Obelisk, located in the Place de la Concorde, Paris, France
• 25 meters – wavelength of the broadcast radio shortwave band at12 MHz
• 29 meters – height of theSavudrija Lighthouse
• 30 meters – height ofChrist the Redeemer
• 31 meters – wavelength of the broadcast radio shortwave band at 9.7 MHz
• 32 meters – length of onearcsecond oflatitude on the surface of theEarth
• 33.3 meters – height of theDe Noord, the tallest windmill in the world
• 34 meters – height of theSplit Point Lighthouse in Aireys Inlet, Victoria, Australia
• 40 meters – wingspan of theMil Mi-26, the largest helicopter
• 40 meters – average depth beneath the seabed of theChannel tunnel
• 49 meters – wavelength of the broadcast radio shortwave band at 6.1 MHz
• 50 meters – length of aroad train
• 50 meters – height of theArc de Triomphe
• 55 meters – height of theLeaning Tower of Pisa
• 62 meters – wingspan ofConcorde
• 62.5 meters – height ofPyramid of Djoser
• 64 meters – wingspan of aBoeing 747-400
• 69 meters – wingspan of anAntonov An-124 Ruslan
• 70 meters – length of theBayeux Tapestry
• 70 meters – width of a typicalassociation football field
• 73 meters – wingspan of aAirbus A380
• 73 meters – height of theTaj Mahal
• 77 meters – wingspan of aBoeing 747-8
• 88.4 meters – wingspan of anAntonov An-225 Mriya transport aircraft
• 93 meters – height of theStatue of Liberty (Liberty Enlightening the World)
• 96 meters – height ofBig Ben
• 100 meters – wavelength of the lowest shortwave radio frequency,3 MHz

• 11 meters – approximate width of a doubles tennis court
• 15 meters – width of a standard FIBA basketball court
• 15.24 meters – width of an NBA basketball court (50 feet)
• 18.44 meters – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches)^[125]
• 20 meters – length of cricket pitch (22 yards)^[126]
• 27.43 meters – distance between bases on a baseball field (90 feet)
• 28 meters – length of a standard FIBA basketball court
• 28.65 meters – length of an NBA basketball court (94 feet)
• 49 meters – width of an American football field (531⁄3 yards)
• 59.436 meters – width of a Canadian football field (65 yards)
• 70 meters – typical width of an association football field
• 91 meters – length of an American football field (100 yards, measured between the goal lines)

• 10 meters – average length of human digestive tract^{[citation needed]}
• 12 meters – height of asaguaro cactus
• 12 meters – length of awhale shark, largest living fish
• 12 meters – wingspan of aQuetzalcoatlus, a pterosaur
• 12.8 meters – length of aTitanoboa, the largest snake to have ever lived
• 13 meters – length of agiant squid andcolossal squid, the largest living invertebrates
• 15 meters – approximate distance the tropical circles of latitude are moving towards the equator and the polar circles are moving towards the poles each year due to a natural, gradual decrease in the Earth's axial tilt
• 16 meters – length of asperm whale, the largest toothed whale
• 18 meters – height of aSauroposeidon, the tallest-known dinosaur
• 20 meters – length of aLeedsichthys, the largest-known fish to have lived
• 21 meters – height ofHigh Force waterfall in England
• 30.5 meters – length of thelion's mane jellyfish, the largest jellyfish in the world
• 33 meters – length of ablue whale,^[127] the largest animal on earth, living or extinct, in terms of mass
• 39 meters – length of aSupersaurus, the longest-known dinosaur and longest vertebrate^[128]
• 52 meters – height ofNiagara Falls^[33]
• 55 meters – length of abootlace worm, the longest-known animal^[129]
• 66 meters – highest possible sea level rise due to a complete melting of all ice on Earth
• 83 meters – height of awestern hemlock
• 84 meters – height ofGeneral Sherman, the largest tree in the world

• 30 meters – diameter of1998 KY26, a rapidly spinning meteoroid
• 30.8568 meters – 1 femtoparsec
• 32 meters – approximate diameter of2008 HJ, a small meteoroid

Thehectometre (SI symbol:hm) is aunit oflength in themetric system equal to 100 meters (10² m). To compare differentorders of magnitude this section lists lengths between 100 meters and 1,000 meters (1kilometer).

100 meters (sometimes termed a hectometer) is equal to:

• 328feet
• one side of a1 hectare square
• a fifth of a modernli, a Chinese unit of measurement
• the approximate distance travelled by light in 300nanoseconds

• 100 meters – wavelength of the highest medium wave radio frequency,3 MHz
• 100 meters – spacing of location marker posts on British motorways
• 110 meters – height of theSaturn V
• 122 meters – height of theStarship, the tallest rocket currently under development bySpaceX
• 138.8 meters – height of theGreat Pyramid of Giza (Pyramid of Cheops)
• 139 meters – height of the world's tallest roller coaster,Kingda Ka^[131]
• 157 meters – height of theCologne Cathedral
• 162 meters – height of theUlm Minster, the tallest church building in the world
• 165 meters – height of theDushanbe Flagpole, the tallest flagpole from May 2011 to September 2014
• 169 meters – height of theWashington Monument
• 171 meters – height of theJeddah Flagpole, the tallest flagpole from September 2014 to December 2021
• 182 meters – height of theStatue of Unity, the world's tallest statue
• 187 meters – shortest wavelength of the broadcast radio AM band,1600 kHz
• 192 meters – height of theGateway Arch
• 202 meters – height of theCairo Flagpole, the tallest flagpole as of December 2021
• 202 meters – length of theSzéchenyi Chain Bridge connecting Buda and Pest
• 220 meters – height of theHoover Dam
• 245 meters – length of theLZ 129 Hindenburg
• 270 meters – length of theTitanic
• 318 meters – height of TheNew York Times Building
• 318.9 meters – height of theChrysler Building
• 328 meters – height of Auckland'sSky Tower, the tallest free-standing structure in the Southern Hemisphere (1996–2022)
• 330 meters – height of theEiffel Tower (including antenna)^[132]
• 336 meters – height of the world's tallest bridge as of October 2023, theMillau Viaduct
• 364.75 meters – length of theIcon of the Seas
• 390 meters – height of theEmpire State Building
• 400–800 meters – approximate heights of the world's tallest skyscrapers from 1931 to 2010
• 458 meters – length of theKnock Nevis, the world's largest supertanker
• 553.33 meters – height of theCN Tower,^[133] the tallest structure in North America
• 555 meters – longest wavelength of the broadcast radio AM band,540 kHz
• 630 meters – height of theKVLY-TV mast, one of the tallest structures in the world
• 646 meters – height of theWarsaw radio mast, the world's tallest structure until its collapse in 1991
• 679 meters – height ofMerdeka 118, the second tallest structure inKuala Lumpur,Malaysia
• 828 meters – height ofBurj Khalifa, world's tallest structure since 17 January 2009^[134]
• 1,000 meters – wavelength of the lowest mediumwave radio frequency,300 kHz

• 100 meters – the distance a very fast human can run in about 10 seconds
• 100.584 meters – length of a Canadian football field between the goal lines (110yards)
• 91.5 meters – 137 meters – length of a soccer field^[119]
• 105 meters – length of football pitch (UEFA stadium categories 3 and 4)
• 105 meters – length of a typical football field
• 109.73 meters – total length of an American football field (120 yards, including the end zones)
• 110–150 meters – the width of an Australian football field
• 135–185 meters – the length of an Australian football field
• 137.16 meters – total length of a Canadian football field, including the end zones (150 yards)

• 115.5 meters – height of the world's tallest tree in 2007, theHyperion sequoia^[135]
• 310 meters – maximum depth ofLake Geneva
• 340 meters – distance sound travels in air at sea level in one second; seeSpeed of sound
• 947 meters – height of theTugela Falls, the highest waterfall in Africa
• 979 meters – height of theAngel Falls, the world's highest free-falling waterfall (Venezuela)

• 270 meters – length of99942 Apophis
• 535 meters – length of25143 Itokawa,^[136] a small asteroid visited by a spacecraft

Thekilometre (SI symbol:km) is aunit oflength in themetric system equal to1000 meters (10³ m). To help compare differentorders of magnitude, this section listslengths between 1 kilometer and 10 kilometers (10³ and 10⁴meters).

1kilometer (unit symbol km) is equal to:

• 1,000meters
• 0.621371miles
• 1,093.61yards
• 3,280.84feet
• 39,370.1inches
• 100,000centimeters
• 1,000,000millimeters
• Side of asquare of area1km²
• Radius of acircle of areaπ km²

• 1 km – wavelength of the highestlong wave radio frequency,300kHz^[137]
• 1.008 km – proposed height of theJeddah Tower, amegatall skyscraper under construction inSaudi Arabia
• 1.280 km – span of theGolden Gate Bridge (distance between towers)^[138]
• 1.609 km – 1 statute mile
• 1.852 km – 1nautical mile, equal to 1arcminute oflatitude at the surface of the Earth^[139]
• 1.991 km – span of theAkashi Kaikyō Bridge^[140]
• 2.309 km – axial length of theThree Gorges Dam, the largestdam in the world located inChina^[34]
• 3.991 km – length of theAkashi Kaikyō Bridge, longestsuspension bridge in the world as of December 2008^{[update][141]}
• 4 km – width ofCentral Park
• 5.072 km – elevation ofTanggula Mountain Pass, below highest peak in theTanggula Mountains, highestrailway pass in the world as of August 2005^{[update][142]}
• 5.8 km – elevation of Cerro Aucanquilcha, highest road in the world, located inChile^[143]
• 98 airports have paved runways from 4 km to 5.5 km in length.
• 8 km – length ofPalm Jebel Ali, anartificial island built off the coast ofDubai
• 9.8 km – length ofThe World, an artificial archipelago that is also built off the coast ofDubai, whose islands resemble aworld map

• 1.5 km – distance sound travels in water in one second

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• 1.637 km – deepest dive ofLake Baikal inRussia, the world's largestfreshwaterlake^[144]
• 2.228 km – height ofMount Kosciuszko, highest point on mainlandAustralia^[145]
• Most ofManhattan is from 3 to 4 km wide.
• 3.776 km – height ofMount Fuji, highest peak inJapan
• 4.478 km – height ofMatterhorn
• 4.509 km – height ofMount Wilhelm, highest peak inPapua New Guinea
• 4.810 km – height ofMont Blanc, highest peak in theAlps
• 4.884 km – height ofCarstensz Pyramid, highest peak inOceania^[146]
• 4.892 km – height ofMount Vinson, highest peak inAntarctica
• 5.610 km – height ofMount Damavand, highest peak inIran
• 5.642 km – height ofMount Elbrus, highest peak inEurope
• 5.895 km – height ofMount Kilimanjaro, highest peak inAfrica
• 6.081 km – height ofMount Logan, highest peak inCanada
• 6.190 km – height ofDenali, highest peak inNorth America
• 6.959 km – height ofAconcagua, highest peak inSouth America
• 7.5 km – depth ofCayman Trench, deepest point in theCaribbean Sea
• 8.611 km – height ofK2, second highest peak onEarth
• 8.848 km – height ofMount Everest, highest peak onEarth, on the border betweenNepal andChina

• 1 km – diameter of1620 Geographos
• 1 km – very approximate size of the smallest-knownmoons of Jupiter
• 1.4 km – diameter ofDactyl, the first confirmedasteroid moon
• 4.8 km – diameter of5535 Annefrank, an inner belt asteroid
• 5 km – diameter of3753 Cruithne
• 5 km – length ofPSR B1257+12
• 8 km – diameter ofThemisto, one ofJupiter's moons
• 8 km – diameter of theVela Pulsar
• 8.6 km – diameter ofCallirrhoe, also known as Jupiter XVII
• 9.737 km – length ofPSR B1919+21

To help compare differentorders of magnitude, this section listslengths between 10 and 100kilometers (10⁴ to 10⁵meters). Themyriameter^[147] (sometimes also spelledmyriometer; 10,000 meters) is a deprecated unit name; the decimal metric prefixmyria-^[98] (sometimes also written asmyrio-^{[148][149][150]}) is obsolete^{[99][100][101]} and was not included among theprefixes when theInternational System of Units was introduced in 1960.

10 kilometers is equal to:

• 10,000meters
• About 6.2miles
• 1mil (theScandinavian mile), now standardized as 10 km:
  • 1 mil, the unit of measure commonly used inNorway andSweden^[151] used to be 11,295 m in Norway and 10,688 m in Sweden.
• farsang, unit of measure commonly used inIran andTurkey^[152]

• 42.195 km – length of themarathon^[153]

• 18 km – cruising altitude ofConcorde
• 27 km – circumference of theLarge Hadron Collider, as of May 2010^[update] the largest and highest energyparticle accelerator
• 34.668 km – highest mannedballoon flight (Malcolm D. Ross and Victor E. Prather on 4 May 1961)^[154]
• 38.422 km – length of the SecondLake Pontchartrain Causeway inLouisiana, US
• 39 km – undersea portion of theChannel tunnel
• 53.9 km – length of theSeikan Tunnel, as of October 2009^[update], the longest rail tunnel in the world^[155]
• 77 km – rough total length of thePanama Canal^[156]

• 10 km – height ofMauna Kea inHawaii, measured from its base on the ocean floor
• 11 km – deepest-known point of the ocean,Challenger Deep in theMariana Trench
• 11 km – average height of thetroposphere
• 14 km – width of theStrait of Gibraltar
• 21 km – length ofManhattan
• 22 km – narrowest width of theCook Strait between New Zealand's main islands
• 23 km – depth of thelargest earthquake ever recorded in the United Kingdom, in 1931 at theDogger Bank of theNorth Sea
• 34 km – narrowest width of theEnglish Channel at theStrait of Dover
• 50 km – approximate height of thestratosphere
• 90 km – width of theBering Strait

• 10 km – diameter of the most massiveneutron stars (3–5solar masses)
• 13 km – mean diameter ofDeimos, the smaller moon ofMars
• 20 km – diameter of the least massive neutron stars (1.44 solar masses)
• 20 km – diameter ofLeda, one ofJupiter's moons
• 20 km – diameter ofPan, one ofSaturn's moons
• 22 km – diameter ofPhobos, the larger moon ofMars
• 27 km – height ofOlympus Mons above theMars reference level,^[157][158] the highest-known mountain of theSolar System
• 30.8568 km – 1 picoparsec
• 43 km – diameter difference ofEarth'sequatorial bulge
• 66 km – diameter ofNaiad, the innermost ofNeptune's moons

A length of100 kilometers (about 62 miles), as a rough amount, is relatively common in measurements on Earth and for some astronomical objects.It is the altitude at which theFAI definesspaceflight to begin.

To help compareorders of magnitude, this section listslengths between 100 and 1,000kilometers (10⁵ and 10⁶meters).

A distance of 100 kilometers is equal to about 62 miles (or 62.13711922 miles).

• 100 km – theKarman line: the internationally recognized boundary ofouter space
• 105 km – distance fromGiridih toBokaro
• 109 km – length ofHigh Speed 1 between London and the Channel Tunnel^[159]
• 130 km – range of aScud-A missile
• 163 km – length of theSuez Canal
• 164 km – length of theDanyang–Kunshan Grand Bridge
• 213 km – length ofParis Métro
• 217 km – length of theGrand Union Canal
• 223 km – length of theMadrid Metro
• 300 km – range of a Scud-B missile
• 386 km – altitude of theInternational Space Station
• 408 km – length of theLondon Underground (active track)
• 460 km – distance fromLondon toParis
• 470 km – distance fromDublin toLondonas the crow flies
• 600 km – range of a Scud-C missile
• 600 km – height above ground of theHubble Space Telescope
• 804.67 km – (500 miles) distance of theIndy 500 automobile race

• 42 km – width ofSingapore
• 75 km – width ofRhode Island
• 111 km – distance covered by one degree oflatitude on Earth's surface
• 120 km – width ofBrunei
• 180 km – distance betweenMumbai andNashik
• 200 km – width ofQatar
• 203 km – length ofSognefjorden, the third-largestfjord in the world
• 220 km – distance betweenPune and Nashik
• 240 km – width ofRwanda
• 240 km – widest width of theEnglish Channel
• 400 km – width ofWest Virginia
• 430 km – length of thePyrenees
• 450 km – length of theGrand Canyon
• 500 km – widest width ofSweden from east to west
• 501 km – width ofUganda
• 550 km – distance fromSan Francisco toLos Angelesas the crow flies
• 560 km – distance ofBordeaux–Paris, formerly^[when?] the longest one-day professional cycling race^[160]
• 590 km – length of land boundary betweenFinland andSweden
• 724 km – length of theOm River
• 800 km – width ofGermany
• 871 km – distance fromSydney toMelbourne (along theHume Highway)
• 897 km – length of theRiver Douro
• 900 km – distance fromBerlin toStockholm
• 956 km – distance fromWashington, D.C., toChicago, Illinois,as the crow flies
• 970 km – distance fromLand's End to John o' Groatsas the crow flies

• 100 km – the altitude at which theFAI definesspaceflight to begin
• 167 km – diameter ofAmalthea, one ofJupiter's inner moons
• 200 km – width ofValles Marineris
• 220 km – diameter ofPhoebe, the largest ofSaturn's outer moons
• 300 km – the approximate distance travelled by light in onemillisecond
• 340 km – diameter ofNereid, the third-largest moon ofNeptune which has a highlyelliptical orbit
• 350 km – lower bound ofLow Earth orbit
• 420 km – diameter ofProteus, the second-largest moon of Neptune
• 468 km – diameter of theasteroid4 Vesta
• 472 km – diameter ofMiranda, one ofUranus's major moons
• 974.6 km – greatest diameter of1 Ceres,^[36] the largest Solar Systemasteroid^{[note 2]}

Themegametre (SI symbol:Mm) is aunit oflength in themetric system equal to1000000 meters (10⁶ m). To help compare differentorders of magnitude, this section listslengths starting at 10⁶m (1 Mm or 1,000km).

1 megameter is equal to:

• 1000 km
• 1 E+6 m (one million meters)
• approximately 621.37miles
• 1 E+12 μm (one trillion micrometers)
• Side ofsquare with area 1,000,000 km²

• 2.100 Mm – length of proposedIran-Pakistan-India gas pipe
• 2.100 Mm – distance fromCasablanca toRome
• 2.288 Mm – length of the officialAlaska Highway when it was built in the 1940s^[161]
• 3.069 Mm – length ofInterstate 95 (fromHoulton, Maine, toMiami, Florida)
• 3.846 Mm – length ofU.S. Route 1 (fromFort Kent, Maine, toKey West, Florida)
• 5.000 Mm – width of theUnited States
• 5.007 Mm – estimated length ofInterstate 90 (Seattle, Washington, to Boston, Massachusetts)
• 5.614 Mm – length of the AustralianDingo Fence^[162]
• 6.371 Mm – global-averageEarth radius
• 6.4 Mm – length of theGreat Wall of China
• 7.821 Mm – length of theTrans-Canada Highway, the world's longest national highway (fromVictoria, British Columbia, toSt. John's, Newfoundland)
• 8.836 Mm – road distance betweenPrudhoe Bay, Alaska, andKey West, Florida, the endpoints of the U.S. road network
• 8.852 Mm – aggregate length of theGreat Wall of China, including trenches, hills and rivers^[163]
• 9.259 Mm – length of theTrans-Siberian railway^[164]

• TheMunda Biddi Trail inWestern Australia,Australia, is over 1,000 km long – the world's longest off-road cycle trail
• 1.200 Mm – the length of theParis–Brest–Paris bicycling event
• Several endurance auto races are, or were, run for 1,000 km:
  • Bathurst 1000
  • 1000 km Brands Hatch
  • 1000 km Buenos Aires
  • 1000 km Donington
  • 1000 km Monza
  • 1000 km Nürburgring
  • 1000 km Silverstone
  • 1000 km Spa
  • 1000 km Suzuka
  • 1000 km Zeltweg

• 1.010 Mm – distance fromSan Diego toEl Pasoas the crow flies
• 1.100 Mm – length ofItaly
• 1.200 Mm – length ofCalifornia
• 1.200 Mm – width ofTexas
• 1.500 Mm – length of theGobi Desert
• 1.600 Mm – length of theNamib, the oldest desert on Earth
• 2.000 Mm – distance fromBeijing toHong Kong as the crow flies
• 2.300 Mm – length of theGreat Barrier Reef
• 2.800 Mm – narrowest width ofAtlantic Ocean (Brazil-West Africa)
• 2.850 Mm – length of theDanube river
• 2.205 Mm – length ofSweden's total land boundaries
• 2.515 Mm – length ofNorway's total land boundaries
• 3.690 Mm – length of theVolga river, longest in Europe
• 4.000 Mm – length of theKalahari Desert
• 4.350 Mm – length of theYellow River
• 4.600 Mm – width of theMediterranean Sea
• 4.800 Mm – length of theSahara
• 4.800 Mm – widest width ofAtlantic Ocean (U.S.-Northern Africa)
• 5.100 Mm – distance fromDublin toNew York as the crow flies
• 6.270 Mm – length of theMississippi-Missouri River system
• 6.380 Mm – length of theYangtze River
• 6.400 Mm – Length of theAmazon River
• 6.758 Mm – Length of theNile system, longest onEarth
• 8.200 Mm – Approximate Distance fromDublin toSan Francisco

• 1.000 Mm – estimated shortest axis oftriaxialdwarf planetHaumea
• 1.186 Mm – diameter ofCharon, the largest moon ofPluto
• 1.280 Mm – diameter of the trans-Neptunian object50000 Quaoar
• 1.436 Mm – diameter ofIapetus, one ofSaturn's major moons
• 1.578 Mm – diameter ofTitania, the largest ofUranus's moons
• 1.960 Mm – estimated longest axis ofHaumea
• 2.326 Mm – diameter of the dwarf planetEris, the largesttrans-Neptunian object found to date
• 2.376 Mm – diameter ofPluto
• 2.707 Mm – diameter ofTriton, largest moon ofNeptune
• 3.122 Mm – diameter ofEuropa, the smallestGalilean satellite ofJupiter
• 3.476 Mm – diameter ofEarth'sMoon
• 3.643 Mm – diameter ofIo, a moon of Jupiter
• 4.821 Mm – diameter ofCallisto, a moon of Jupiter
• 4.879 Mm – diameter ofMercury
• 5.150 Mm – diameter ofTitan, the largest moon of Saturn
• 5.262 Mm – diameter of Jupiter's moonGanymede, the largest moon in theSolar System
• 6.371 Mm –radius of Earth
• 6.792 Mm – diameter ofMars

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To help compare differentorders of magnitude, this section listslengths starting at 10⁷meters (10 megameters or 10,000kilometers).

10 megameters (10 Mm) is

• 6,215miles
• side of asquare of area 100,000,000square kilometers (km²)
• radius of acircle of area 314,159,265 km²

• 11.085 Mm – length of theKyiv-Vladivostok railway, a longer variant of theTrans-Siberian railway^[165]
• 13.300 Mm – length of roads rehabilitated and widened under theNational Highway Development Project (launched in 1998) inIndia
• 39.000 Mm – length of theSEA-ME-WE 3 optical submarine telecommunications cable, joining 39 points betweenNorden, Germany, andOkinawa, Japan
• 67.000 Mm – total length ofNational Highways in India
• 80.000 Mm – 20,000 (metric, French)leagues (seeJules Verne,Twenty Thousand Leagues Under the Seas)

• 10 Mm – approximate altitude of the outer boundary of theexosphere
• 10.001 Mm – length of themeridian arc from theNorth Pole to theEquator (the original definition of themeter was based on this length)
• 40.000 Mm – length of theRing of Fire
• 60.000 Mm – total length of themid-ocean ridges

• 12.000 Mm – diameter ofSirius B, awhite dwarf^[166]
• 12.104 Mm – diameter ofVenus
• 12.742 Mm – diameter ofEarth
• 12.900 Mm – minimum distance of themeteoroid2004 FU162 from the centre of Earth on 31 March 2004, closest on record
• 14.000 Mm – smallest diameter of Jupiter'sGreat Red Spot
• 19.000 Mm – separation betweenPluto andCharon
• 30.8568 Mm – 1 nanoparsec
• 34.770 Mm – minimum distance of theasteroid99942 Apophis on 13 April 2029 from the centre of Earth
• 35.786 Mm – altitude ofgeostationary orbit
• 40.005 Mm – polar circumference of the Earth
• 40.077 Mm – equatorial circumference of the Earth
• 49.528 Mm – diameter ofNeptune
• 51.118 Mm – diameter ofUranus

To help compare differentorders of magnitude, this section listslengths starting at 10⁸meters (100 megameters or 100,000kilometers or 62,150miles).

• 102 Mm – diameter ofHD 149026 b, an unusually denseJovian planet
• 115 Mm – width of Saturn's Rings
• 120 Mm – diameter ofEBLM J0555-57Ab, the smallest-known star
• 120 Mm – diameter ofSaturn
• 142 Mm – diameter ofJupiter, the largest planet in theSolar System
• 170 Mm – diameter ofTRAPPIST-1, a star discovered to have seven planets around it
• 174 Mm – diameter ofOGLE-TR-122b, one of the smallest known stars
• 180 Mm – average distance covered during life
• 215 Mm – diameter ofProxima Centauri, the nearest star to the Solar System
• 257 Mm – diameter ofTrES-4, one of the largest exoplanets
• 260 Mm – diameter of theBarnard's Star
• 272 Mm – diameter ofWASP-12b
• 299.792 Mm – onelight-second; the distancelight travels invacuum in onesecond (seespeed of light)
• 314 Mm – diameter ofCT Cha b
• 384.4 Mm (238,855 mi) – averageEarth–Moon distance^[167]
• 671 Mm – separation betweenJupiter andEuropa
• 696 Mm –radius ofSun
• 989 Mm – diameter ofEpsilon Indi, one of the nearest stars to Earth

Thegigametre (SI symbol:Gm) is aunit oflength in themetric system equal to1000000000 meters (10⁹ m). To help compare different distances this section lists lengths starting at 10⁹meters (1 gigameter (Gm) or 1 billionmeters).

• 1.2 Gm – separation betweenSaturn andTitan
• 1.39 Gm – diameter ofSun^[168][169]
• 1.5 Gm – orbit from Earth of theJames Webb Space Telescope
• 1.71 Gm – diameter ofAlpha Centauri A, one of the closest stars.^[170]
• 2.19 Gm – closest approach ofComet Lexell toEarth, happened on 1 July 1770; closestcomet approach on record
• 2.38 Gm – diameter ofSirius A, brightest naked eye star.^[171]
• 3 Gm – total length of "wiring" in the human brain^[172]
• 3.5 Gm – diameter ofVega^[173]
• 4.2 Gm – diameter ofAlgol B
• 4.3 Gm – circumference ofSun
• 5.0 Gm – closest approach ofComet Halley to Earth, happened on 10 April 837
• 5.0 Gm –(proposed) Size of the arms of the giant triangle shaped Michelson interferometer of theLaser Interferometer Space Antenna (LISA) planned to start observations sometime in the 2030s.
• 7.9 Gm – diameter ofGamma Orionis, a blue dwarf or blue giant
• 9.0 Gm – estimated diameter of theevent horizon ofSagittarius A*, thesupermassive black hole in the center of theMilky Way galaxy

To help compare differentdistances this section lists lengths starting at 10¹⁰meters (10gigameters (Gm) or 10 millionkilometers, or 0.07astronomical units).

• 10.4 Gm – diameter of Spica, an oval-shaped blue giant star and anearby supernova candidate.^[174]
• 12.6 Gm – diameter ofPollux, the closestred giantstar to the Sun.^[175] It is ared clump star fusing helium into carbon at its core.^[176]
• 15 Gm – closest distance ofComet Hyakutake fromEarth
• 18 Gm – onelight-minute (see yellow sphere in right-hand diagram)
• 24 Gm – radius of aheliostationary orbit
• 30.8568 Gm – 1 microparsec
• 35 Gm – approximate diameter ofArcturus, a close red giant star.^[177] It is on thered giant branch, fusing hydrogen into helium in a shell surrounding an inert helium core.^[176]
• 46 Gm –perihelion distance ofMercury (yellow ellipse on the right)
• 55 Gm – 60,000-yearperigee ofMars (last achieved on 27 August 2003)
• 58 Gm – average passing distance betweenEarth and Mars at the moment they overtake each other in their orbits
• 61 Gm – diameter ofAldebaran, a red giant branch star (large star on right)^[178]
• 70 Gm –aphelion distance of Mercury
• 76 Gm –Neso'sapocentric distance; greatest distance of anatural satellite from its parentplanet (Neptune)

To help compare distances at differentorders of magnitude this section lists lengths starting at 10¹¹meters (100gigameter or 100 millionkilometers or 0.7astronomical units).

• 103 Gm (0.69 au) – diameter ofRigel^[175]
• 109 Gm (0.7 au) – distance between Venus and the Sun
• 149.6 Gm (93.0 million mi; 1.0 au) – average distance between theEarth and the Sun – the original definition of theastronomical unit
• 199 Gm (1.3 au) – diameter ofRho Persei, anasymptotic giant branch star, fusing carbon into neon in a shell surrounding an inert core.^[179]
• 228 Gm (1.5 au) – distance betweenMars and the Sun
• 248 Gm (1.7 au) – diameter ofEnif, a smallred supergiant star in the constellationPegasus^[180]
• 280 Gm (1.9 au) – diameter ofDeneb, a blue supergiant and the brightest star in theCygnus constellation^[181]
• 511 Gm (3.4 au) – average diameter ofMira, a pulsating red giant and the progenitor of theMira variables. It is anasymptotic giant branch star.^[182]
• 570 Gm (3.8 au) – length of the tail ofComet Hyakutake measured byUlysses; the actual value could be much higher
• 590 Gm (3.9 au) – diameter of thePistol Star, a bluehypergiant star^[183]
• 591 Gm (4.0 au) – minimum distance between theEarth andJupiter
• 780 Gm (5.2 au) – average distance between Jupiter and the Sun
• 785 Gm (5.25 au) – diameter ofRho Cassiopeiae, a rareyellow hypergiant star^[184]
• 947 Gm (6.4 au) – diameter ofAntares A
• 965 Gm (6.4 au) – maximum distance between the Earth and Jupiter

Theterametre (SI symbol:Tm) is aunit oflength in themetric system equal to1000000000000 meters (10¹² m). To help compare differentdistances, this section lists lengths starting at 10¹²m (1Tm or 1 billionkm or 6.7astronomical units).

• ≈1 Tm – 6.7 au – diameter of the red supergiantBetelgeuse based on multiple angular diameter estimates^[185]
• 1.032 Tm – 6.9 au – diameter of the blue hypergiantEta Carinae (at optical depth 2/3)^[186]
• 1.079 Tm – 7.2 au – onelight-hour
• 1.114 Tm – 7.5 au – diameter ofWOH G64, a star in theLarge Magellanic Cloud, which recently transformed from a red hypergiant to a yellow hypergiant^[187]
• 1.4 Tm – 9.5 au – average distance betweenSaturn and theSun
• 1.47 Tm – 9.9 au – diameter ofHR 5171 A, ayellow hypergiant star.^[188]
• 1.5 Tm – 10 au – estimated diameter ofVV Cephei A, a red hypergiant with a blue dwarf companion.^[189]
• 1.75 Tm – 11.7 au – estimated diameter ofMu Cephei, a red supergiant (possibly hypergiant) among thelargest-known stars.^[190]
• 2 Tm – 13.2 au – estimated diameter ofVY Canis Majoris, a red hypergiant that is among thelargest-known stars^[191][192]
• 2.142 Tm – 14.3 au – estimated diameter ofWOH G64, prior to its transformation into a yellow hypergiant.
• 2.9 Tm – 19.4 au – average distance betweenUranus and the Sun
• 4.4 Tm – 29.4 au –perihelion distance ofPluto
• 4.5 Tm – 30.1 au – average distance betweenNeptune and the Sun
• 4.5 Tm – 30.1 au – inner radius of theKuiper belt
• 5.7 Tm – 38.1 au – perihelion distance ofEris
• 6.0 Tm – 40.5 au – distance fromEarth at which thePale Blue Dot photograph was taken.
• 7.3 Tm – 48.8 au –aphelion distance ofPluto
• 7.5 Tm – 50.1 au – outer boundary of theKuiper Belt

To help compare differentdistances this section lists lengths starting at 10¹³m (10Tm or 10 billionkm or 67astronomical units).

• 10 Tm – 67 AU – diameter of a hypotheticalquasi-star
• 11.1 Tm – 74.2 AU – distance thatVoyager 1 began detecting returning particles fromtermination shock
• 11.4 Tm – 76.2 AU –perihelion distance of90377 Sedna
• 12.1 Tm – 70 to 90 AU – distance totermination shock (Voyager 1 crossed at 94 AU)
• 12.9 Tm – 86.3 AU – distance to 90377 Sedna in March 2014
• 13.2 Tm – 88.6 AU – distance toPioneer 11 in March 2014
• 14.1 Tm – 94.3 AU – estimated radius of theSolar System
• 14.4 Tm – 96.4 AU – distance toEris in March 2014 (now near itsaphelion)
• 15.1 Tm – 101 AU – distance toheliosheath
• 16.5 Tm – 111 AU – distance toPioneer 10 as of March 2014
• 16.6 Tm – 111.2 AU – distance toVoyager 2 as of May 2016
• 18 Tm – 123.5 AU – distance between theSun to the farthest dwarf planet in the Solar System, the Farout2018 VG18
• 20.0 Tm – 135 AU – distance toVoyager 1 as of May 2016
• 20.6 Tm – 138 AU – distance toVoyager 1 as of late February 2017
• 21.1 Tm – 141 AU – distance toVoyager 1 as of November 2017
• 24.8 Tm – 166 AU – distance toVoyager 1 as of November 2024
• 25.9 Tm – 173 AU – onelight-day
• 30.8568 Tm – 206.3 AU – 1 milliparsec
• 55.7 Tm – 371 AU – aphelion distance of thecometHale-Bopp

This list isincomplete; you can help byadding missing items.(November 2012)

To help compare differentdistances this section lists lengths starting at 10¹⁴m (100Tm or 100 billionkm or 670astronomical units).

• 140 Tm – 937 AU –aphelion distance of90377 Sedna
• 172 Tm – 1150 AU –Schwarzschild diameter ofH1821+643, one of the most massiveblack holes known
• 181 Tm – 1210 AU – onelight-week
• 308.568 Tm – 2063 AU – 1 centiparsec
• 757 Tm – 5059 AU – radius of theStingray Nebula^[193]
• 777 Tm – 5180 AU – onelight-month

Thepetametre (SI symbol:Pm) is aunit oflength in themetric system equal to 10¹⁵ meters. To help compare differentdistances this section lists lengths starting at 10¹⁵m (1 Pm or 1 trillionkm or 6685astronomical units (AU) or 0.11light-years).

• 1.0 Pm = 0.105702341 light-years
• 1.9 Pm ± 0.5 Pm = 12,000 AU = 0.2 light-year radius ofCat's Eye Nebula's inner core^[194][195]
• 3.08568 Pm = 20,626 AU = 1 deciparsec
• 4.7 Pm = 30,000 AU = half-light-year diameter ofBok globuleBarnard 68^[196]
• 7.5 Pm – 50,000 AU – possible outer boundary ofOort cloud (other estimates are 75,000 to 125,000 or even 189,000AU (1.18, 2, and 3light-years, respectively))
• 9.5 Pm – 63,241.1 AU – onelight-year, the distance light travels in one year
• 9.9 Pm – 66,000 AU –aphelion distance of theC/1999 F1 (Catalina)

To help compare different distances this section lists lengths starting at 10¹⁶m (10Pm or 66,800AU, 1.06light-years).

• 15 Pm – 1.59 light-years – possible outer radius ofOort cloud
• 20 Pm – 2.11 light-years – maximum extent of influence of the Sun'sgravitational field^{[citation needed]}
• 30.9 Pm – 3.26 light-years – 1parsec
• 39.9 Pm – 4.22 light-years – distance toProxima Centauri (nearest star toSun)
• 81.3 Pm – 8.59 light-years – distance toSirius
• 94.6 Pm – 1 light-decade

To help compare differentdistances this section lists lengths between 10¹⁷m (100Pm or 11light-years) and 10¹⁸ m (106 light-years).

• 110 Pm – 12 light-years – Distance toTau Ceti
• 230 Pm – 24 light-years – Diameter of theOrion Nebula^[197][198]
• 240 Pm – 25 light-years – Distance toVega
• 260 Pm – 27 light-years – Distance toChara, a star approximately as bright as the Sun. Its faintness gives an idea how theSun would appear when viewed from this distance.
• 308.568 Tm – 32.6 light-years – 1 dekaparsec
• 350 Pm – 37 light-years – distance toArcturus
• 373.1 Pm – 39.44 light-years – distance toTRAPPIST-1, a star recently discovered to have 7 planets around it
• 400 Pm – 42 light-years – distance toCapella
• 620 Pm – 65 light-years – distance toAldebaran
• 750 Pm – 79.36 light-years – distance toRegulus
• 900 Pm – 92.73 light-years – distance toAlgol
• 946 Pm – 1 light-century

Theexametre (SI symbol:Em) is aunit oflength in themetric system equal to 10¹⁸meters. To help compare differentdistances this section lists lengths between 10¹⁸ m (1 Em or 105.7light-years) and 10¹⁹ m (10 Em or 1,057 light-years).

• 1.2 Em – 129 light-years – diameter ofMessier 13 (a typicalglobular cluster)
• 1.6 Em – 172 ± 12.5 light-years – diameter ofOmega Centauri (one of the largest-knownglobular clusters, perhaps containing over a millionstars)^[199][200]
• 3.08568 Em – 326.1 light-years – 1 hectoparsec
• 3.1 Em – 310 light-years – distance toCanopus according toHipparcos^[201]
• 3.9 Em – 410 light-years – distance toBetelgeuse according toHipparcos^[202]
• 6.2 Em – 650 light-years – distance to theHelix Nebula, located in the constellationAquarius^[203]
• 8.2 Em – 860 light-years – distance toRigel according toHipparcos^[201]
• 9.4 Em — 1 light-millennium – 1000 light-years

To help compare differentorders of magnitude, this section listsdistances starting at 10Em (10¹⁹m or 1,100light-years).

• 10.6 Em – 1,120 light-years – distance toWASP-96b
• 13 Em – 1,300 light-years – distance to theOrion Nebula^[204]
• 14 Em – 1,500 light-years – approximate thickness of theplane of theMilky Waygalaxy at theSun's location
• 14.2 Em – 1,520 light-years – diameter of theNGC 604
• 30.8568 Em – 3,261.6 light-years – 1kiloparsec
• 31 Em – 3,200 light-years – distance toDeneb according toHipparcos
• 46 Em – 4,900 light-years – distance toOGLE-TR-56, the firstextrasolar planet discovered using thetransit method
• 47 Em – 5,000 light-years – distance to theBoomerang nebula, coldest place known (1 K)
• 53 Em – 5,600 light-years – distance to theglobular clusterM4 and theextrasolar planetPSR B1620-26 b within it
• 61 Em – 6,500 light-years – distance toPerseus Spiral Arm (next spiral arm out in the Milky Way galaxy)
• 71 Em – 7,500 light-years – distance toEta Carinae
• 94.6073 Em – 1 light-decamillennium = 10,000 light-years

To help compare differentorders of magnitude, this section listsdistances starting at 100Em (10²⁰m or 11,000light-years).

• 150 Em – 16,000 light-years – diameter of theSmall Magellanic Cloud, adwarf galaxy orbiting theMilky Way
• 200 Em – 21,500 light-years – distance toOGLE-2005-BLG-390Lb
• 240 Em – 25,000 light-years – distance to theCanis Major Dwarf Galaxy
• 260 Em – 28,000 light-years – distance to the center of theGalaxy
• 400 Em – 48,000 light years – diameter of theFireworks Galaxy
• 830 Em – 88,000 light-years – distance to theSagittarius Dwarf Elliptical Galaxy
• 946 Em – 1 light-centum-millennium = 100,000 light-years

Thezettametre (SI symbol:Zm) is aunit oflength in themetric system equal to 10²¹meters.^[55] To help compare differentorders of magnitude, this section listsdistances starting at 1 Zm (10²¹ m or 110,000light-years).

• 1.7 Zm – 179,000 light-years – distance to theLarge Magellanic Cloud, largestsatellite galaxy of theMilky Way
• <1.9 Zm – <200,000 light-years – revised estimated diameter of the disc of theMilky Way Galaxy. The size was previously thought to be half of this.
• 2.0 Zm – 210,000 light-years – distance to theSmall Magellanic Cloud
• 2.8 Zm – 300,000 light-years – distance to theIntergalactic Wanderer, one of the most distantglobular clusters of Milky Way
• 8.5 Zm – 900,000 light-years – distance to theLeo I Dwarf Galaxy, farthest-knownMilky Way satellitegalaxy

To help compare differentorders of magnitude, this section listsdistances starting at 10Zm (10²²m or 1.1 millionlight-years).

• 24 Zm – 2.5 million light-years – distance to theAndromeda Galaxy, the nearest majorgalaxy.
• 30.8568 Zm – 3.2616 million light-years – 1megaparsec
• 40 Zm – 4.2 million light-years – distance to theIC 10, a distant member of theLocal Group ofgalaxies
• 49.2 Zm – 5.2 million light-years – width of theLocal Group ofgalaxies
• 95 Zm – 10 million light-years – distance to theSculptor Galaxy in theSculptor Group of galaxies
• 95 Zm – 10 million light-years – distance to theMaffei 1, the nearest giantelliptical galaxy in theMaffei 1 Group

To help compare differentorders of magnitude, this section listsdistances starting at 100Zm (10²³m or 11 millionlight-years).

• 140 Zm – 15 million light-years – distance toCentaurus A galaxy
• 250 Zm – 27 million light-years – distance to thePinwheel Galaxy
• 280 Zm – 30 million light-years – distance to theSombrero Galaxy
• 570 Zm – 60 million light-years – approximate distance to theVirgo cluster, nearestgalaxy cluster
• 620 Zm – 65 million light-years – approximate distance to theFornax cluster
• 800 Zm – 85 million light-years – approximate distance to theEridanus cluster

Theyottametre (SI symbol:Ym) is aunit oflength in themetric system equal to 10²⁴ meters.^[55]

To help compare differentorders of magnitude, this section listsdistances starting at 1 Ym (10²⁴m or 105.702 millionlight-years).

• 1.2 Ym – 127 million light-years – distance to the closest observedgamma ray burstGRB 980425
• 1.3 Ym – 137 million light-years – distance to theCentaurus Cluster ofgalaxies, the nearest largesupercluster
• 1.9 Ym – 201 million light-years – diameter of theLocal Supercluster
• 2.17 Ym – 1 light-galactic-years – 230 million light-years
• 2.3 Ym – 225 to 250 million light-years – distance light travels in vacuum in onegalactic year
• 2.8 Ym – 296 million light-years – distance to theComa Cluster
• 3.15 Ym – 330 million light years – diameter of theBoötes Void
• 3.2 Ym – 338 million light-years – distance toStephan's Quintet
• 4.7 Ym – 496 million light-years – length of theCfA2 Great Wall, one of the largest observed superstructures in theUniverse
• 6.1 Ym – 645 million light-years – distance to theShapley Supercluster
• 9.5 Ym – 996 million light-years – diameter of theEridanus Supervoid

To help compare differentorders of magnitude, this section listsdistances starting at 10Ym (10²⁵m or 1.1 billionlight-years). At this scale, expansion of theuniverse becomes significant. Distance of these objects are derived from their measuredredshifts, which depends on thecosmological models used.

• 13 Ym – 1.37 billion light-years – length of theSouth Pole Wall
• 13 Ym – 1.38 billion light-years – length of theSloan Great Wall
• 18 Ym – redshift 0.16 – 1.9 billion light-years – distance to thequasar3C 273 (light travel distance)
• 30.8568 Ym – 3.2616 billion light-years – 1 gigaparsec
• 31.2204106 Ym − 3.3 billion light-years − length ofThe Giant Arc, a large cosmic structure discovered in 2021
• 33 Ym – 3.5 billion light-years – maximum distance of the2dF Galaxy Redshift Survey (light travel distance)
• 37.8 Ym – 4 billion light-years – length of theHuge-LQG
• 75 Ym – redshift 0.95 – 8 billion light-years – approximate distance to thesupernova SN 2002dd in theHubble Deep Field North (light travel distance)
• 85 Ym – redshift 1.6 – 9 billion light-years – approximate distance to thegamma-ray burstGRB 990123 (light travel distance)
• 94.6 Ym – 10 billion light-years – approximate distance to quasar OQ172
• 94.6 Ym – 10 billion light-years – length of theHercules–Corona Borealis Great Wall, one of thelargest and most massive-known cosmic structures known

To help compare differentorders of magnitude, this section listsdistances starting at 100Ym (10²⁶m or 11 billionlight-years). At this scale, expansion of theuniverse becomes significant. Distance of these objects are derived from their measuredredshifts, which depend on thecosmological models used.

• 124 Ym – redshift 7.54 – 13.1 billion light-years –light travel distance (LTD) to thequasarULAS J1342+0928, themost distant-known quasar as of 2017
• 130 Ym – redshift 1,000 – 13.8 billion light-years – distance (LTD) to the source of thecosmic microwave background radiation; radius of the observableuniverse measured as a LTD
• 260 Ym – 27.4 billion light-years – diameter of the observable universe (double LTD)
• 440 Ym – 46 billion light-years – radius of the universe measured as acomoving distance
• 590 Ym – 62 billion light-years – cosmologicalevent horizon: the largest comoving distance from which light will ever reach us (the observer) at any time in the future
• 886.48 Ym – 93.7 billion light-years – the diameter of theobservable universe (twice theparticle horizon); however, there might be unobserved distances that are even greater.

Theronnametre (SI symbol:Rm) is aunit oflength in themetric system equal to 10²⁷ meters.^[55]

To help compare differentorders of magnitude, this section listsdistances starting at 1 Rm (10²⁷m or 105.7 billionlight-years). At this scale, expansion of theuniverse becomes significant. Distance of these objects are derived from their measuredredshifts, which depend on thecosmological models used.

• >1 Rm – >105.7 billion light-years – size of universe beyond thecosmic light horizon, depending on its curvature; if the curvature is zero (i.e. the universe is spatially flat), the value can beinfinite (seeShape of the universe) as previously mentioned.
• 2.764 Rm - 292.2 billion light-years – circumference of the observable universe, as it is in the shape of a sphere.
• ≈10^1010122light-years – the possible size of the universe aftercosmological inflation.
• ≈∞ light-years – theoretical size of themultiverse if it exists.

• List of examples of lengths
• Fermi problem
• Scale (analytical tool)
• Spatial scale
• The Scale of the Universe