# Orders of magnitude (length)

The following are examples of orders of magnitude for different lengths.

## Overview

## Detailed list

To help compare different orders of magnitude, the following list describes various lengths between metres and metres.### Subatomic scale

### Atomic to cellular scale

Factor | Multiple | Value | Item |

10^{−15} | 1 femtometre | 1 fm | Approximate limit of the gluon-mediated color force between quarks |

10^{−15} | 1 femtometre | 1.5 fm | Effective cross section radius of an 11 MeV proton |

10^{−15} | 1 femtometre | 2.81794 fm | Classical electron radius |

10^{−15} | 1 femtometre | 3 fm | Approximate limit of the meson-mediated nuclear binding force |

10^{−15} | 1 femtometre | 1.75 to 15 fm | Diameter range of the atomic nucleus |

### Cellular to human scale

Factor | Multiple | Value | Item |

10^{−6} | 1 micrometre | 1–4 μm | Typical length of a bacterium |

10^{−6} | 1 micrometre | 4 μm | Typical diameter of spider silk |

10^{−6} | 1 micrometre | 7 μm | Typical size of a red blood cell |

10^{−5} | 10 μm | 10 μm | Typical size of a fog, mist, or cloud water droplet |

10^{−5} | 10 μm | 10 μm | Width of transistors in the Intel 4004, the world's first commercial microprocessor |

10^{−5} | 10 μm | 12 μm | Width of acrylic fiber |

10^{−5} | 10 μm | 17-181 μm | Width range of human hair |

10^{−4} | 100 μm | 340 μm | Size of a single pixel on a 17-inch monitor with a resolution of 1024×768 |

10^{−4} | 100 μm | 560 μm | Thickness of the central area of a human cornea |

10^{−4} | 100 μm | 750 μm | Maximum diameter of Thiomargarita namibiensis, the largest bacterium ever discovered |

### Human to astronomical scale

### Astronomical scale

## Less than 1 zeptometre

To help compare different orders of magnitude, this section lists lengths shorter than 10^{−21}m.

- 1.6 × 10
^{−11}yoctometres – the Planck length. - 1 ym – 1 yoctometre, the smallest named subdivision of the metre in the SI base unit of length, one septillionth of a metre
- 2 ym – the effective cross-section radius of 1 MeV neutrinos as measured by Clyde Cowan and Frederick Reines
## 1 zeptometre

^{−21}m and 10

^{−20}m.

- 2 zm – the upper bound for the width of a cosmic string in string theory.
- 2 zm – radius of effective cross section for a 20 GeV neutrino scattering off a nucleon
- 7 zm – radius of effective cross section for a 250 GeV neutrino scattering off a nucleon
## 10 zeptometres

^{−20}m and 10

^{−19}m.

## 100 zeptometres

To help compare different orders of magnitude, this section lists lengths between 10^{−19}m and 10

^{−18}m.

- 177 zm – de Broglie wavelength of protons at the Large Hadron Collider
## 1 attometre

^{−18}m and 10

^{−17}m.

- 1 am – sensitivity of the LIGO detector for gravitational waves
- 1 am – upper limit for the size of quarks and electrons
## 10 attometres

^{−17}m and 10

^{−16}m.

- 10 am – range of the weak force
## 100 attometres

^{−16}m and 10

^{−15}m.

- 100 am – all lengths shorter than this distance are not confirmed in terms of size
- 850 am – approximate proton radius
## 1 femtometre

**femtometre**is a unit of length in the metric system, equal to 10

^{−15}metres. In particle physics, this unit is more commonly called a fermi, also with abbreviation "fm". To help compare different orders of magnitude, this section lists lengths between 10

^{−15}metres and 10

^{−14}metres.

- 1 fm – diameter of a neutron, approximate range-limit of the color force carried between quarks by gluons
- 1.5 fm – diameter of the scattering cross section of an 11 MeV proton with a target proton
- 1.75 fm – the effective charge diameter of a proton
- 2.81794 fm – classical electron radius
- 3 fm – approximate range-limit of the nuclear binding force mediated by mesons
- 7 fm – the radius of the effective scattering cross section for a gold nucleus scattering a 6 MeV alpha particle over 140 degrees
## 10 femtometres

^{−14}m and 10

^{−13}m.

- 1.75 to 15 fm – Diameter range of the atomic nucleus
## 100 femtometres

^{−13}m and 10

^{−12}m.

- 570 fm – typical distance from the atomic nucleus of the two innermost electrons in the uranium atom, the heaviest naturally-occurring atom
## 1 picometre

^{−12}and 10

^{−11}m.

- 1 pm – distance between atomic nuclei in a white dwarf
- 1 pm – reference value of particle displacement in acoustics
- 2.4 pm – The Compton wavelength of the electron
- 5 pm – shorter X-ray wavelengths
## 10 picometres

^{−11}and 10

^{−10}m.

- 25 pm – approximate radius of a helium atom, the smallest neutral atom
- 50 pm – radius of a hydrogen atom
- 50 pm – bohr radius: approximate radius of a hydrogen atom
- ~50 pm – best resolution of a high-resolution transmission electron microscope
- 60 pm – radius of a carbon atom
- 93 pm – length of a diatomic carbon molecule
## 100 picometres

^{−10}and 10

^{−9}m.

- 100 pm – 1 ångström
- 100 pm – covalent radius of sulfur atom
- 120 pm – van der Waals radius of a neutral hydrogen atom
- 120 pm – radius of a gold atom
- 126 pm – covalent radius of ruthenium atom
- 135 pm – covalent radius of technetium atom
- 150 pm – Length of a typical covalent bond
- 153 pm – covalent radius of silver atom
- 155 pm – covalent radius of zirconium atom
- 175 pm – covalent radius of thulium atom
- 200 pm – highest resolution of a typical electron microscope
- 225 pm – covalent radius of caesium atom
- 280 pm – Average size of the water molecule
- 298 pm – radius of a caesium atom, calculated to be the largest atomic radius
- 340 pm – thickness of single layer graphene
- 356.68 pm – width of diamond unit cell
- 403 pm – width of lithium fluoride unit cell
- 500 pm – Width of protein α helix
- 543 pm – silicon lattice spacing
- 560 pm – width of sodium chloride unit cell
- 700 pm – width of glucose molecule
- 780 pm – mean width of quartz unit cell
- 820 pm – mean width of ice unit cell
- 900 pm – mean width of coesite unit cell
## 1 nanometre

^{−9}and 10

^{−8}m.

- 1 nm – length of a buckyball
- 1 nm – diameter of a carbon nanotube
- 1 nm – roughly the length of a sucrose molecule, calculated by Albert Einstein
- 2.3 nm – length of a phospholipid
- 2.3 nm – smallest gate oxide thickness in microprocessors
- 3 nm – width of a DNA helix
- 3 nm – flying height of the head of a hard disk
- 3 nm – as of 2019, the average half-pitch of a memory cell expected to be manufactured circa 2022
- 3.4 nm – length of a DNA turn
- 3.8 nm – size of an albumin molecule
- 5 nm – size of the gate length of a 16 nm processor
- 5 nm – as of 2018, the average half-pitch of a memory cell expected to be manufactured circa 2019-2020
- 6 nm – length of a phospholipid bilayer
- 6-10 nm – thickness of cell membrane
- 6.8 nm – width of a haemoglobin molecule
- 7 nm – the average half-pitch of a memory cell manufactured circa 2018
- 10 nm – Thickness of cell wall in Gram-negative bacteria
## 10 nanometres

^{−8}and 10

^{−7}m.

- 10 nm – the average length of a nanowire
- 10 nm – lower size of tobacco smoke
- 10 nm – the average half-pitch of a memory cell manufactured circa 2016–2017
- 13 nm – the length of the wavelength that is used for EUV lithography
- 14 nm – Length of a porcine circovirus
- 14 nm – the average half-pitch of a memory cell manufactured circa 2013
- 15 nm – Length of an antibody
- 18 nm – diameter of tobacco mosaic virus
- 20 nm – Length of a nanobe, could be one of the smallest forms of life
- 20 nm to 80 nm – thickness of cell wall in Gram-positive bacteria
- 20 nm – thickness of bacterial flagellum
- 22 nm – the average half-pitch of a memory cell manufactured circa 2011-2012
- 22 nm – Smallest feature size of production microprocessors in September 2009
- 30 nm – lower size of cooking oil smoke
- 32 nm – the average half-pitch of a memory cell manufactured circa 2009–2010
- 40 nm – extreme ultraviolet wavelength
- 45 nm – the average half-pitch of a memory cell manufactured circa 2007–2008
- 50 nm – upper size for airborne virus particles
- 50 nm – flying height of the head of a hard disk
- 65 nm – the average half-pitch of a memory cell manufactured circa 2005–2006
- 58 nm – height of a T7 bacteriophage
- 90 nm – Human immunodeficiency virus
- 90 nm – the average half-pitch of a memory cell manufactured circa 2002–2003
- 100 nm – Length of a mesoporous silica nanoparticle
## 100 nanometres

^{−7}and 10

^{−6}m.

- 100 nm – greatest particle size that can fit through a surgical mask
- 100 nm – 90% of particles in wood smoke are smaller than this.
- 120 nm – greatest particle size that can fit through a ULPA filter
- 120 nm – diameter of a human immunodeficiency virus
- 120 nm – approximate diameter of SARS-CoV-2, the virus that causes COVID-19
- 125 nm – standard depth of pits on compact discs
- 180 nm – typical length of the rabies virus
- 200 nm – typical size of a
*Mycoplasma*bacterium, among the smallest bacteria - 300–400 nm – near ultraviolet wavelength
- 300 nm – greatest particle size that can fit through a HEPA filter
- 400–420 nm – wavelength of violet light
- 420–440 nm – wavelength of indigo light
- 440–500 nm – wavelength of blue light
- 500–520 nm – wavelength of cyan light
- 520–565 nm – wavelength of green light
- 565–590 nm – wavelength of yellow light
- 590–625 nm – wavelength of orange light
- 625–700 nm – wavelength of red light
- 700–1.4 μm – wavelength of near-infrared radiation
## 1 micrometre

^{−6}and 10

^{−5}m.

- ~0.7–300 μm – wavelength of infrared radiation
- 1 μm – the side of square of area 10
^{−12}m^{2} - 1 μm – edge of cube of volume 10
^{−18}m^{3} - 1–10 μm – diameter of a typical bacterium
- 1 μm – length of a lysosome
- 1-2 μm – anthrax spore
- 2 μm – length of an average E. coli bacteria
- 3–4 μm – size of a typical yeast cell
- 5 μm – length of a typical human spermatozoon's head
- 6 μm – thickness of the tape in a 120-minute compact cassette
- 7 μm – diameter of the nucleus of a typical eukaryotic cell
- about 7 μm – diameter of human red blood cells
- 3–8 μm – width of strand of spider web silk
- 5-10 μm – width of a chloroplast
- 8-11 μm – size of a ground-level fog or mist droplet
## 10 micrometres

^{−5}m and 10

^{−4}m.

- 10 μm – width of cotton fibre
- 10 μm – transistor width of the Intel 4004, the world's first commercial microprocessor
- 10 μm – mean longest dimension of a human red blood cell
- 5–20 μm – dust mite excreta
- 10.6 μm – wavelength of light emitted by a carbon dioxide laser
- 15 μm – width of silk fibre
- 17 μm – minimum width of a strand of human hair
- 17.6 μm – one twip, a unit of length in typography
- 10 to 55 μm – width of wool fibre
- 25.4 μm – 1/1000 inch, commonly referred to as 1 mil in the U.S. and 1 thou in the UK
- 30 μm – length of a human skin cell
- 50 μm – typical length of
*Euglena gracilis*, a flagellate protist - 50 μm – typical length of a human liver cell, an average-sized body cell
- 50 μm – length of a silt particle
- 60 μm – length of a sperm cell
- 70 to 180 μm – thickness of paper
## 100 micrometres

^{−4}m and 10

^{−3}m. The term

*myriometre*is deprecated; the decimal metric prefix myrio- is obsolete and was not included among the prefixes when the International System of Units was introduced in 1960.

- 100 μm – 1/10 of a millimetre
- 100 μm – 0.00394 inches
- 100 μm – smallest distance that can be seen with the naked eye
- 100 μm – average diameter of a strand of human hair
- 100 μm – thickness of a coat of paint
- 100 μm – length of a dust particle
- 120 μm – the geometric mean of the Planck length and the diameter of the observable universe:
- 120 μm – diameter of a human ovum
- 170 μm – length of the largest sperm cell in nature, belonging to the
*Drosophila bifurca*fruit fly - 181 μm – maximum width of a strand of human hair
- 100–400 μm – length of Demodex mites living in human hair follicles
- 200 μm – typical length of
*Paramecium caudatum*, a ciliate protist - 200 μm - nominal width of the smallest commonly available mechanical pencil lead
- 250–300 μm – length of a dust mite
- 340 μm – length of a single pixel on a 17-inch monitor with a resolution of 1024×768
- 500 μm – typical length of
*Amoeba proteus*, an amoeboid protist - 500 μm – average length of a grain of sand
- 500 μm – average length of a grain of salt
- 500 μm – average length of a grain of sugar
- 560 μm – thickness of the central area of a human cornea
- 750 μm – diameter of a Thiomargarita namibiensis, the largest bacteria known
- 760 μm – thickness of an identification card
## 1 millimetre

^{−3}m and 10

^{−2}m.

- 1.0 mm – 1/1000 of a metre
- 1.0 mm – 0.03937 inches or 5/127
- 1.0 mm – side of square of area 1 mm²
- 1.0 mm – diameter of a pinhead
- 1.5 mm – length of average flea
- 2.54 mm – distance between pins on old dual in-line package 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 a
*Paedophryne amauensis*, the smallest known vertebrate - 7.1 mm – length of a sunflower seed
- 7.62×51mm NATO – common military ammunition size
- 8 mm – width of old-format home movie film
- 8 mm – length of a
*Paedocypris progenetica*, the smallest known fish## 1 centimetre

^{−2}m and 10

^{−1}m.

- 1 cm – 10 millimetres
- 1 cm – 0.39 inches
- 1 cm – edge of square of area 1 cm
^{2} - 1 cm – edge of cube of volume 1 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
- 2 cm – approximate width of an adult human finger
- 2.54 cm – 1 inch
- 3.1 cm – 1 attoparsec
- 3.4 cm – length of a quail egg
- 3.5 cm – width of film commonly used in motion pictures and still photography
- 4.3 cm – minimum diameter of a golf ball
- 5 cm – usual diameter of a chicken egg
- 5 cm – height of a hummingbird, the smallest known bird
- 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
- 8.6 cm × 5.4 cm – dimensions of a standard credit card
- 9 cm – length of a speckled padloper, the smallest known turtle
## 1 decimetre

### Conversions

10 centimetres is equal to:- 1 decimetre, a term not in common use
- 100 millimetres
- 3.9 inches
- a side of a square of area 0.01 m
^{2} - the edge of a cube with a volume of m
^{3}### Wavelengths

- 10 cm = 1.0 dm – wavelength of the highest UHF radio frequency, 3 GHz
- 12 cm = 1.2 dm – wavelength of the 2.45 GHz ISM radio band
- 21 cm = 2.1 dm – wavelength of the 1.4 GHz hydrogen emission line, a hyperfine transition of the hydrogen atom
- 100 cm = 10 dm – wavelength of the lowest UHF radio frequency, 300 MHz
### Human-defined scales and structures

- 10.16 cm = 1.016 dm – 1 hand used in measuring height of horses
- 12 cm = 1.2 dm – diameter of a compact disc
- 15 cm = 1.5 dm – length of a Bic pen with cap on
- 22 cm = 2.2 dm – diameter of a typical association football
- 30 cm = 3 dm – typical school-use ruler length
- 30.48 cm = 3.048 dm – 1 foot
- 60 cm = 6 dm – standard depth of a domestic kitchen worktop in Europe
- 90 cm = 9 dm – average length of a rapier, a fencing sword
- 91.44 cm = 9.144 dm – one yard
### Nature

- 10 cm = 1 dm – diameter of the human cervix upon entering the second stage of
- 11 cm = 1.1 dm – diameter of an average potato in the US
- 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 travels in one nanosecond
- 31 cm = 3.1 dm – wingspan of largest butterfly species
*Ornithoptera alexandrae* - 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
### Astronomical

- 84 cm = 8.4 dm – approximate diameter of 2008 TS26, a meteoroid
## 1 metre

Light travels 1 metre in, or of a second.

### Conversions

1 metre is:- 10 decimetres
- 100 centimetres
- 1,000 millimetres
- 39.37 inches
- 3.28 feet
- side of square with area 1 m
^{2} - edge of cube with surface area 6 m
^{2}and volume 1 m^{3} - radius of circle with area 3.14 m
^{2} - radius of sphere with surface area 12.56 m
^{2}and volume 4.19 m^{3}### Human-defined scales and structures

- 1 m – approximate height of the top part of a doorknob on a door
- 1 m – diameter of a very large beach ball
- 1.435 m – standard gauge of railway track used by about 60% of railways in the world = 4 ft 8½ in
- 2.5 m – distance from the floor to the ceiling in an average residential house
- 2.7 m – length of the Starr 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 old Mini
- 8.38 m – the length of a London Bus
### Sports

- 2.44 m – height of an association football goal
- 2.45 m – highest high jump by a human being
- 3.05 m – height of the basket in basketball
- 8.95 m – longest long jump by a human being
### Nature

- 1 m – height of
*Homo floresiensis* - 1.15 m – a pizote
- 1.37 m – average height of an Andamanese person
- 1.63 m – - height of average US female human
- 1.75 m – - height of average US male human
- 2.5 m – height of a sunflower
- 2.72 m – - tallest known human being
- 3.63 m – the record wingspan for living birds
- 5 m – length of an elephant
- 5.2 m – height of a giraffe
- 5.5 m – height of a
*Baluchitherium*, the largest land mammal ever lived - 7 m – wingspan of
*Argentavis*, the largest flying bird known - 7.5 m – approximate length of the human gastrointestinal tract
### Astronomical

- 3–6 m – approximate diameter of, a meteoroid
- 4.1 m – diameter of 2008 TC3, a small asteroid that flew into the Earth's atmosphere on October 7, 2008.
## 1 decametre

### Conversions

10 metres is equal to:- 10 metres
- 100 decimetres
- 1,000 centimetres
- 10,000 millimetres
- 32.8 feet
- side of square with area 100 m²
### Human-defined scales and structures

- 10 metres – wavelength of the highest shortwave radio frequency, 30 MHz
- 23 metres – height of the obelisk of the Place de la Concorde, Paris, France
- 25 metres – wavelength of the broadcast radio shortwave band at 12 MHz
- 29 metres – height of the lighthouse at Savudrija, Slovenia
- 31 metres – wavelength of the broadcast radio shortwave band at 9.7 MHz
- 34 metres – height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia
- 40 metres – average depth beneath the seabed of the Channel tunnel
- 49 metres – wavelength of the broadcast radio shortwave band at 6.1 MHz
- 50 metres – length of a road train
- 55 metres – height of the Leaning Tower of Pisa
- 62.5 metres – height of Pyramid of Djoser
- 64 metres – wingspan of a Boeing 747-400
- 69 metres – wingspan of an Antonov An-124 Ruslan
- 70 metres – length of the Bayeux Tapestry
- 70 metres – width of a typical association football field
- 77 metres – wingspan of a Boeing 747-8
- 88.4 metres – wingspan of the Antonov An-225
*Mriya*transport aircraft - 93 metres – height of the Statue of Liberty
- 96 metres – height of Big Ben
- 100 metres – wavelength of the lowest shortwave radio frequency, 3 MHz
### Sports

- 11 metres – approximate width of a
*doubles*tennis court - 15 metres – width of a standard FIBA basketball court
- 15.24 metres – width of an NBA basketball court
- 18.44 metres – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field
- 20 metres – length of cricket pitch
- 27.43 metres – distance between bases on a baseball field
- 28 metres – length of a standard FIBA basketball court
- 28.65 metres – length of an NBA basketball court
- 49 metres – width of an American football field
- 59.436 metres – width of a Canadian football field
- 70 metres – typical width of soccer field
- 91 metres – length of American football field
- 105 metres – length of football pitch
### Nature

- 10 metres – average length of human digestive tract
- 12 metres – length of a whale shark, largest living fish
- 12 metres – wingspan of a
*Quetzalcoatlus*, a pterosaur - 13 metres – length of a giant squid and colossal squid, the largest living invertebrates
- 15 metres – 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
- 18 metres – height of a
*Sauroposeidon*, the tallest known dinosaur - 20 metres – length of a
*Leedsichthys*, the largest known fish ever lived - 21 metres – height of High Force waterfall in England
- 33 metres – length of a blue whale, the largest animal on earth, living or extinct, in terms of mass
- 35 metres – length of a
*Supersaurus*, the longest known dinosaur and longest vertebrate - 52 metres – height of Niagara Falls
- 55 metres – length of a bootlace worm, the longest known animal
- 83 metres – height of a Western hemlock
### Astronomical

- 30 metres – diameter of, a rapidly spinning meteoroid
- 32 metres – approximate diameter of 2008 HJ, a small meteoroid
## 1 hectometre

### Conversions

100 metres is equal to:- 328 feet
- one side of a 1 hectare square
- a fifth of a modern li, a Chinese unit of measurement
- the approximate distance travelled by light in 300 nanoseconds
### Human-defined scales and structures

- 100 metres – wavelength of the highest medium wave radio frequency, 3 MHz
- 100 metres – spacing of location marker posts on British motorways
- 138.8 metres – height of the Great Pyramid of Giza
- 139 metres – height of the world's tallest roller coaster, Kingda Ka
- 187 metres – shortest wavelength of the broadcast radio AM band, 1600 kHz
- 202 metres – length of the Széchenyi Chain Bridge connecting Buda and Pest
- 318 metres – height of The New York Times Building
- 318.9 metres – height of the Chrysler Building
- 320.75 metres – height of the Eiffel Tower
- 328 metres – height of Auckland's Sky Tower, the tallest free-standing structure in the Southern Hemisphere
- 341 metres – height of the world's tallest bridge, the Millau Viaduct
- 390 metres – height of the Empire State Building
- 400–800 metres – approximate heights of the world's tallest skyscrapers of the past 80 years
- 458 metres – length of the Knock Nevis, the world's largest supertanker
- 553.33 metres – height of the CN Tower
- 555 metres – longest wavelength of the broadcast radio AM band, 540 kHz
- 630 metres – height of the KVLY-TV mast, second tallest structure in the world
- 646 metres – height of the Warsaw radio mast, the world's tallest structure until its collapse in 1991
- 828 metres – height of Burj Khalifa, world's tallest structure on 17 January 2009
- 1,000 metres – wavelength of the lowest mediumwave radio frequency, 300 kHz
### Sports

- 100 metres – the distance a very fast human being can run in about 10 seconds
- 100.584 metres – length of a Canadian football field between the goal lines
- 91.5 metres – 137 metres – length of a soccer field
- 105 metres – length of a typical football field
- 109.73 metres – total length of an American football field
- 110 – 150 metres-the width of an Australian football field
- 135 – 185 metres the length of an Australian football field
- 137.16 metres – total length of a Canadian football field, including the end zones
### Nature

- 115.5 metres – height of the world's tallest tree in 2007, the Hyperion sequoia
- 310 metres – maximum depth of Lake Geneva
- 340 metres – distance sound travels in air at sea level in one second; see Speed of sound
- 979 metres – height of the Salto Angel, the world's highest free-falling waterfall
- 1500 metres – distance sound travels in water in one second;
### Astronomical

- 270 metres – length of 99942 Apophis
- 535 metres – length of 25143 Itokawa, a small asteroid visited by a spacecraft
## 1 kilometre

### Conversions

1 kilometre is equal to:- 1,000 metres
- 0.621371 miles
- 1,093.61 yards
- 3,280.84 feet
- 39,370.1 inches
- 100,000 centimetres
- 1,000,000 millimetres
- Side of a square of area 1 km
^{2} - Radius of a circle of area π km
^{2}### Human-defined scales and structures

- 1 km – wavelength of the highest long wave radio frequency, 300 kHz
- 1.280 km – span of the Golden Gate Bridge
- 1.609 km – 1 mile
- 1.852 km – 1 nautical mile, equal to 1 arc minute of latitude at the surface of the Earth
- 1.991 km – span of the Akashi Kaikyō Bridge
- 2.309 km – axial length of the Three Gorges Dam, the largest dam in the world
- 3.991 km – length of the Akashi Kaikyō Bridge, longest suspension bridge in the world
- 5.072 km – height of Tanggula Mountain Pass, below highest peak in the Tanggula Mountains, highest railway pass in the world
- 5.727 km – height of Cerro Aucanquilcha, highest road in the world, located in Chile
- 98 airports have paved runways from 4 km to 5.5 km in length.
- 8 km – length of Palm Jebel Ali, an artificial island built off the coast of Dubai
- 9.8 km – length of The World, an artificial archipelago that is also built off the coast of Dubai, whose islands resemble a world map
### Geographical

- 1.637 km – deepest dive of Lake Baikal in Russia, the world's largest fresh water lake
- 2.228 km – height of Mount Kosciuszko, highest point on mainland Australia
- Most of Manhattan is from 3 to 4 km wide.
- 4.810 km – height of Mont Blanc, highest peak in the Alps
- 4.884 km – height of Carstensz Pyramid, highest peak in Oceania
- 4.892 km – height of Mount Vinson, highest peak in Antarctica
- 5.610 km – height of Mount Damavand, highest peak in Iran
- 5.642 km – height of Mount Elbrus, highest peak in Europe
- 5.895 km – height of Mount Kilimanjaro, highest peak in Africa
- 6.081 km – height of Mount Logan, highest peak in Canada
- 6.194 km – height of Denali, highest peak in North America
- 6.959 km – height of Aconcagua, highest peak in South America
- 7.5 km – depth of Cayman Trench, deepest point in the Caribbean Sea
- 8.848 km – height of Mount Everest, highest peak on Earth, on the border between Nepal and China
### Astronomical

- 1 km – diameter of 1620 Geographos
- 1 km – very approximate size of the smallest known moons of Jupiter
- 1.4 km – diameter of Dactyl, the first confirmed asteroid moon
- 4.8 km – diameter of 5535 Annefrank, an inner belt asteroid
- 5 km – diameter of 3753 Cruithne
- 5 km – length of PSR B1257+12
- 8 km – diameter of Themisto, one of Jupiter's moons
- 8 km – diameter of the Vela Pulsar
- 8.6 km – diameter of Callirrhoe, also known as Jupiter XVII
- 9.737 km – length of PSR B1919+21
## 10 kilometres

*myriametre*is a deprecated unit name; the decimal metric prefix myria- is obsolete and not included among the prefixes when the International System of Units was introduced in 1960.

### Conversions

10 kilometres is equal to:: 36 myriametres from Basel. The stated distance is 360 km; comma is the decimal separator in Germany.

- 10,000 metres
- 6.2 miles
- 1
*mil*, now standardized as 10 km: - *1 mil, the unit of measure commonly used in Norway and Sweden used to be 11,295 m in Norway and 10,688 m in Sweden.
*farsang*, unit of measure commonly used in Iran and Turkey### Sports

- 42.195 km – length of the marathon
### Human-defined scales and structures

- 18 km – cruising altitude of Concorde
- 27 km – circumference of the Large Hadron Collider, the largest and highest energy particle accelerator
- 34.668 km – highest manned balloon flight
- 38.422 km – length of the Second Lake Pontchartrain Causeway in Louisiana, US
- 39 km – undersea portion of the Channel tunnel
- 53.9 km – length of the Seikan Tunnel,, the longest rail tunnel in the world
- 77 km – Rough total length of the Panama Canal
### Geographical

- 10 km – height of Mauna Kea in Hawaii, measured from its base on the ocean floor
- 11 km – deepest known point of the ocean, Challenger Deep in the Mariana Trench
- 11 km – average height of the troposphere
- 14 km – width of the Gibraltar strait
- 21 km – length of Manhattan
- 23 km – depth of the largest earthquake ever recorded in the United Kingdom, in 1931 at the Dogger Bank of the North Sea
- 34 km – narrowest width of the English Channel at the Strait of Dover
- 50 km – approximate height of the stratosphere
- 90 km – width of the Bering Strait
### Astronomical

- 10 km – diameter of the most massive neutron stars
- 13 km – mean diameter of Deimos, the smaller moon of Mars
- 20 km – diameter of the least massive neutron stars
- 20 km – diameter of Leda, one of Jupiter's moons
- 20 km – diameter of Pan, one of Saturn's moons
- 22 km – diameter of Phobos, the larger moon of Mars
- 27 km – height of Olympus Mons above the Mars reference level, the highest known mountain of the Solar System
- 43 km – diameter difference of Earth's equatorial bulge
- 66 km – diameter of Naiad, the innermost of Neptune's moons
## 100 kilometres

**100 kilometres**, as a rough amount, is relatively common in measurements on Earth and for some astronomical objects.

It is the altitude at which the FAI defines spaceflight to begin.

To help compare orders of magnitude, this section lists lengths between 100 and 1,000 kilometres.

### Conversions

A distance of 100 kilometres is equal to about 62 miles.### Human-defined scales and structures

- 100 km – the Karman line: the official boundary of outer space
- 105 km – distance from Giridih to Bokaro
- 109 km – length of High Speed 1 between London and the Channel Tunnel
- 130 km – range of a Scud-A missile
- 163 km – length of the Suez Canal
- 164 km – length of the Danyang–Kunshan Grand Bridge
- 213 km – length of Paris Métro
- 217 km – length of the Grand Union Canal
- 223 km – length of the Madrid Metro
- 300 km – range of a Scud-B missile
- 386 km – altitude of the International Space Station
- 408 km – length of the London Underground
- 460 km – distance from London to Paris
- 470 km – distance from Dublin to London as the crow flies
- 600 km – range of a Scud-C missile
- 600 km – height above ground of the Hubble Space Telescope
- 804.67 km – distance of the Indy 500 automobile race
### Geographical

- 111 km – distance covered by one degree of latitude on Earth's surface
- 180 km – distance between Mumbai and Nashik
- 203 km – length of Sognefjorden, the third largest fjord in the world
- 220 km – distance between Pune and Nashik
- 240 km – widest width of the English Channel
- 430 km – length of the Pyrenees
- 500 km – widest width of Sweden from east to west
- 550 km – distance from San Francisco to Los Angeles as the crow flies
- 560 km – distance of Bordeaux–Paris, formerly the longest one-day professional cycling race
- 590 km – length of land boundary between Finland and Sweden
- 724 km – length of the Om River
- 871 km – distance from Sydney to Melbourne
- 897 km – length of the River Douro
- 900 km – distance from Berlin to Stockholm
- 956 km - distance from Washington, DC to Chicago, Illinois as the crow flies
### Astronomical

- 100 km – the altitude at which the FAI defines spaceflight to begin
- 167 km – diameter of Amalthea, one of Jupiter's inner moons
- 200 km – width of Valles Marineris
- 220 km – diameter of Phoebe, the largest of Saturn's outer moons
- 300 km – the approximate distance travelled by light in one millisecond
- 340 km – diameter of Nereid, the third largest moon of Neptune
- 350 km – lower bound of Low Earth orbit
- 420 km – diameter of Proteus, the second largest moon of Neptune
- 468 km – diameter of the asteroid 4 Vesta
- 472 km – diameter of Miranda, one of Uranus' major moons
- 974.6 km – greatest diameter of 1 Ceres, the largest solar system asteroid
## 1 megametre

^{6}m.

### Conversions

1 megametre is equal to:- 1 E+6 m
- approximately 621.37 miles
- Side of square with area 1,000,000 km
^{2}### Human-defined scales and structures

- 2.100 Mm – Length of proposed gas pipeline from Iran to India via Pakistan
- 2.100 Mm – Distance from Casablanca to Rome
- 2.288 Mm – Length of the official Alaska Highway when it was built in the 1940s
- 3.069 Mm – Length of Interstate 95
- 3.846 Mm – Length of U.S. Route 1
- 5.000 Mm – Width of the United States
- 5.007 Mm – Estimated length of Interstate 90
- 5.614 Mm – Length of the Australian Dingo Fence
- 6.4 Mm – Length of the Great Wall of China
- 7.821 Mm – Length of the Trans-Canada Highway, the world's longest national highway
- 8.836 Mm – Road distance between Prudhoe Bay, Alaska, and Key West, Florida, the endpoints of the U.S. road network
- 8.852 Mm – Aggregate length of the Great Wall of China, including trenches, hills and rivers
- 9.259 Mm – Length of the Trans-Siberian railway
### Sports

- The Munda Biddi Trail in WA, Australia is over 1000 km long - the world's longest off-road cycle trail
- 1.200 Mm – the length of the Paris–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
### Geographical

- 1.010 Mm – Distance from San Diego to El Paso as the crow flies
- 2.000 Mm – Distance from Beijing to Hong Kong as the crow flies
- 2.800 Mm – Narrowest width of Atlantic Ocean
- 2.850 Mm – Length of the Danube river
- 2.205 Mm – Length of Sweden's total land boundaries
- 2.515 Mm – Length of Norway's total land boundaries
- 3.690 Mm – Length of the Volga river, longest in Europe
- 4.350 Mm – Length of the Yellow River
- 4.800 Mm – Widest width of Atlantic Ocean
- 5.100 Mm – Distance from Dublin to New York as the crow flies
- 6.270 Mm – Length of the Mississippi-Missouri River system
- 6.380 Mm – Length of the Yangtze River
- 6.400 Mm – Length of the Amazon River
- 6.758 Mm – Length of the Nile system, longest on Earth
- 8.200 Mm – Distance from Dublin to San Francisco as the crow flies
### Astronomical

- 1.000 Mm – Estimated shortest axis of triaxial dwarf planet
- 1.186 Mm – Diameter of Charon, the largest moon of Pluto
- 1.280 Mm – Diameter of the trans-Neptunian object 50000 Quaoar
- 1.436 Mm – Diameter of Iapetus, one of Saturn's major moons
- 1.578 Mm – Diameter of Titania, the largest of Uranus' moons
- 1.960 Mm – Estimated longest axis of Haumea
- 2.326 Mm – Diameter of the dwarf planet Eris, the largest trans-Neptunian object found to date
- 2.376 Mm – Diameter of Pluto
- 2.707 Mm – Diameter of Triton, largest moon of Neptune
- 3.122 Mm – Diameter of Europa, the smallest Galilean satellite of Jupiter
- 3.476 Mm – Diameter of Earth's Moon
- 3.643 Mm – Diameter of Io, a moon of Jupiter
- 4.821 Mm – Diameter of Callisto, a moon of Jupiter
- 4.879 Mm – Diameter of Mercury
- 5.150 Mm – Diameter of Titan, the largest moon of Saturn
- 5.262 Mm – Diameter of Jupiter's moon Ganymede, the largest moon in the solar system
- 6.371 Mm – Radius of Earth
- 6.792 Mm – Diameter of Mars
## 10 megametres

^{7}metres.

### Conversions

10 megametres is- 6,215 miles
- side of a square of area 100,000,000 square kilometres
- radius of a circle of area 314,159,265 km
^{2}### Human-defined scales and structures

- 11.085 Mm – Length of the Kiev-Vladivostok railway, a longer variant of the Trans-Siberian railway
- 13.300 Mm – Length of roads being rehabilitated and widened under the National Highway Development Project in India
- 39.000 Mm – Length of the SEA-ME-WE 3 optical submarine telecommunications cable, joining 39 points between Norden, Germany and Okinawa, Japan
- 67.000 Mm – Total length of National Highways in India
- 80.000 Mm – 20,000 leagues
### Geographical

- 10 Mm – Approximate altitude of the outer boundary of the exosphere
- 10.001 Mm – Length of the meridian arc from the North Pole to the Equator
- 60.000 Mm – Total length of the mid-ocean ridges
### Astronomical

- 12.000 Mm – Diameter of Sirius B, a white dwarf
- 12.104 Mm – Diameter of Venus
- 12.742 Mm – Diameter of Earth
- 12.900 Mm – Minimum distance of the meteoroid from the centre of Earth on 31 March 2004, closest on record
- 14.000 Mm – Smallest diameter of Jupiter's Great Red Spot
- 19.000 Mm – Separation between Pluto and Charon
- 34.770 Mm – Minimum distance of the asteroid 99942 Apophis on 13 April 2029 from the centre of Earth
- 35.786 Mm – Altitude of geostationary orbit
- 40.005 Mm – Polar circumference of the Earth
- 40.077 Mm – Equatorial circumference of the Earth
- 49.528 Mm – Diameter of Neptune
- 51.118 Mm – Diameter of Uranus
## 100 megametres

^{8}metres.

- 102 Mm – Diameter of HD 149026 b, an unusually dense Jovian planet
- 115 Mm – Width of Saturn's Rings
- 120 Mm – Diameter of EBLM J0555-57Ab, the smallest known star
- 120 Mm – Diameter of Saturn
- 142 Mm – Diameter of Jupiter, the largest planet in the solar system
- 170 Mm – Diameter of TRAPPIST-1, a star recently discovered to have 7 planets around it
- 174 Mm – Diameter of OGLE-TR-122b
- 180 Mm – Average distance covered during life
- 196 Mm – Diameter of Proxima Centauri, a typical red dwarf
- 257 Mm – Diameter of TrES-4 b
- 272 Mm – Diameter of WASP-12b
- 299.792 Mm – One light second; the distance light travels in vacuum in one second
- 300 Mm – Diameter of WASP-79b
- 314 Mm – Diameter of CT Cha b
- 384.4 Mm – Average Earth-Moon distance
- 671 Mm – Separation between Jupiter and Europa
- 428 Mm – Diameter of GQ Lupi b, one of the largest known planets
- 986 Mm – Diameter of HD 100546 b's surrounding disk
## 1 gigametre

^{9}metres.

- 1.2 Gm – Separation between Saturn and Titan
- 1.39 Gm – Diameter of Sun
- 1.5 Gm –
*Expected orbit from Earth of the James Webb Space Telescope* - 2.19 Gm – Closest approach of Comet Lexell to Earth, happened on 1 July 1770; closest comet approach on record
- 3 Gm – Total length of "wiring" in the human brain
- 4.2 Gm – Diameter of Algol B
- 5.0 Gm – Closest approach of Comet Halley to Earth, happened on 10 April 837
*5.0 Gm – Size of the arms of the giant triangle shaped Michelson interferometer of the Laser Interferometer Space Antenna planned to start observations sometime in the 2030s.*- 7.9 Gm – Diameter of Gamma Orionis
- 9.0 Gm – Estimated diameter of the event horizon of Sagittarius A*, the supermassive black hole in the center of the Milky Way galaxy
## 10 gigametres

^{10}metres.

- 15 Gm – Closest distance of Comet Hyakutake from Earth
- 18 Gm – One light-minute
- 24 Gm – Radius of a heliostationary orbit
- 46 Gm – Perihelion distance of Mercury
- 55 Gm – 60,000-year perigee of Mars
- 55 Gm - Radius of Rigel, a blue supergiant star
- 58 Gm – Average passing distance between Earth and Mars at the moment they overtake each other in their orbits
- 61 Gm – Diameter of Aldebaran, an orange giant star
- 70 Gm – Aphelion distance of Mercury
- 76 Gm – Neso's apocentric distance; greatest distance of a natural satellite from its parent planet
## 100 gigametres

^{11}metres.

- 109 Gm Distance between Venus and the Sun
- 149.6 Gm – Distance between the Earth and the Sun - the original definition of the astronomical unit
- 180 Gm – Maximum diameter of Sagittarius A*, the supermassive black hole in the center of Milky Way galaxy
- 228 Gm – Distance between Mars and the Sun
- 570 Gm – Length of the tail of Comet Hyakutake measured by
*Ulysses*; the actual value could be much higher - 591 Gm – Minimum distance between the Earth and Jupiter
- 780 Gm – Distance between Jupiter and the Sun
- 947 Gm – Diameter of Antares A
- 965 Gm – Maximum distance between the Earth and Jupiter
## 1 terametre

^{12}m.

- 1.079 [|Tm] – 7.2 AU – One light-hour
- 1.4 Tm – 9.5 AU – Distance between Saturn and the Sun
- 1.83 Tm – 12.2 AU – Diameter of HR 5171 A, the largest known yellow hypergiant star although the latest research suggests it is a red hypergiant with a diameter about 2.1 Tm
- 1.5 Tm - 10 AU - Estimated diameter of VV Cephei A, a red supergiant.
- 2 Tm – 13.2 AU – Estimated diameter of VY Canis Majoris, one of the largest known stars.
- 2.9 Tm – 19.4 AU – Distance between Uranus and the Sun
- 3 Tm – 20 AU – Diameter of Stephenson 2-18, the largest known star.
- 4.4 Tm – 29.4 AU – Perihelion distance of Pluto
- 4.5 Tm – 30.1 AU – Distance between Neptune and the Sun
- 4.5 Tm – 30.1 AU – Inner radius of the Kuiper belt
- 5.7 Tm – 38.1 AU – Perihelion distance of Eris
- 7.3 Tm – 48.8 AU – Aphelion distance of Pluto
- 7.5 Tm – 50.1 AU – Outer radius of the Kuiper Belt, inner boundary of the Oort Cloud
## 10 terametres

^{13}m.

- 10 Tm – 67 AU – Diameter of a hypothetical quasi-star
- 11.1 Tm – 74.2 AU – Distance that
*Voyager 1*began detecting returning particles from termination shock - 11.4 Tm – 76.2 AU – Perihelion distance of 90377 Sedna
- 12.1 Tm – 70 to 90 AU – Distance to termination shock
- 12.9 Tm – 86.3 AU – Distance to 90377 Sedna in March 2014
- 13.2 Tm – 88.6 AU – Distance to
*Pioneer 11*in March 2014 - 14.1 Tm – 94.3 AU – Estimated radius of the solar system
- 14.4 Tm – 96.4 AU – Distance to Eris in March 2014
- 15.1 Tm – 101 AU – Distance to heliosheath
- 16.5 Tm – 111 AU – Distance to
*Pioneer 10*as of March 2014 - 16.6 Tm - 111.2 AU - Distance to
*Voyager 2*as of May 2016 - 20.0 Tm - 135 AU - Distance to
*Voyager 1*as of May 2016 - 20.6 Tm – 138 AU - Distance to
*Voyager 1*as of late February 2017 - 21.1 Tm – 141 AU - Distance to
*Voyager 1*as of November 2017 - 25.9 Tm – 172 AU – One light-day
- 55.7 Tm – 371 AU – Aphelion distance of the comet Hale-Bopp
## 100 terametres

^{14}m.

- 146 Tm – 975 AU – Aphelion distance of 90377 Sedna
- 172 Tm – 1150 AU – Schwarzschild diameter of H1821+643, one of the most massive black holes known
- 181 Tm – 1210 AU – One light-week
- 653 Tm – 4367 AU – Aphelion distance of comet Hyakutake
- 757 Tm – 5059 AU – radius of the Stingray Nebula
- 777 Tm – 5180 AU – One light-month
## 1 petametre

^{15}m.

- 1.0 [|Pm] = 0.105702341 light years
- 1.9 Pm ± 0.5 Pm = 12,000 AU = 0.2 light year radius of Cat's Eye Nebula's inner core
- 4.7 Pm = 30,000 AU = half light year diameter of Bok globule Barnard 68
- 7.5 Pm – 50,000 AU – Possible outer boundary of Oort cloud
- 7.7 Pm – 52,000 AU – Aphelion distance of the Great Daylight Comet of 1910
- 9.5 Pm – 63,241.1 AU – One light year, the distance travelled by light in one year
## 10 petametres

^{16}m.

- 15 Pm – 1.59 light years – Possible outer radius of Oort cloud
- 20 Pm – 2.11 light years – maximum extent of influence of the Sun's gravitational field
- 30.9 Pm – 3.26 light years – 1 parsec
- 39.9 Pm – 4.22 light years – Distance to Proxima Centauri
- 81.3 Pm – 8.59 light years – Distance to Sirius
## 100 petametres

^{17}m and 10

^{18}m.

- 110 Pm – 12 light years – Distance to Tau Ceti
- 230 Pm – 24 light years – Diameter of the Orion Nebula
- 240 Pm – 25 light years – Distance to Vega
- 260 Pm – 27 light years – Distance to Chara, a star approximately as bright as our Sun. Its faintness gives us an idea how our Sun would appear when viewed from even so close a distance as this.
- 350 Pm – 37 light years – Distance to Arcturus
- 373.1 Pm – 39.44 light years - Distance to TRAPPIST-1, a star recently discovered to have 7 planets around it
- 400 Pm – 42 light years – Distance to Capella
- 620 Pm – 65 light years – Distance to Aldebaran
- 750 Pm - 79.36 light years - Distance to Regulus
- 900 Pm - 92.73 light years - Distance to Algol
## 1 exametre

**exametres**. To help compare different distances this section lists lengths between 10

^{18}m and 10

^{19}m.

- 1.2 Em – 129 light years – Diameter of Messier 13
- 1.6 Em – 172 ± 12.5 light years – Diameter of Omega Centauri
- 3.1 Em – 310 light years – Distance to Canopus according to
*Hipparcos* - 6.1 Em – 640 light years – Distance to Betelgeuse according to
*Hipparcos* - 6.2 Em – 650 light years – Distance to the Helix Nebula, located in the constellation Aquarius
- 7.3 Em – 730 light years – Distance to Rigel according to
*Hipparcos*## 10 exametres

- 13 Em – 1,300 light years – Distance to the Orion Nebula
- 14 Em – 1,500 light years – Approximate thickness of the plane of the Milky Way galaxy at the Sun's location
- 14.2 Em – 1,520 light years – Diameter of the NGC 604
- 30.8568 Em – 3,261.6 light years – 1 kiloparsec
- 31 Em – 3,200 light years – Distance to Deneb according to
*Hipparcos* - 46 Em – 4,900 light years – Distance to OGLE-TR-56, the first extrasolar planet discovered using the transit method
- 47 Em – 5,000 light years – Distance to the Boomerang nebula, coldest place known
- 53 Em – 5,600 light years – Distance to the globular cluster M4 and the extrasolar planet PSR B1620-26 b within it
- 61 Em – 6,500 light years – Distance to Perseus Spiral Arm
- 71 Em – 7,500 light years – Distance to Eta Carinae
## 100 exametres

- 150 Em – 16,000 light years – Diameter of the Small Magellanic Cloud, a dwarf galaxy orbiting the Milky Way
- 200 Em – 21,500 light years – Distance to OGLE-2005-BLG-390Lb, the most distant and the most Earth-like planet known
- 240 Em – 25,000 light years – Distance to the Canis Major Dwarf Galaxy
- 260 Em – 28,000 light years – Distance to the center of the Galaxy
- 830 Em – 88,000 light years – Distance to the Sagittarius Dwarf Elliptical Galaxy
## 1 zettametre

**zettametre**is a unit of length in the metric system equal to 10

^{21}metres.

To help compare different orders of magnitude, this section lists distances starting at 1 Zm.

- 1.7 Zm – 179,000 light years – Distance to the Large Magellanic Cloud, largest satellite galaxy of the Milky Way
- <1.9 Zm – <200,000 light years – Revised estimated diameter of the disc of the Milky Way Galaxy. The size was previously thought to be half of this.
- 2.0 Zm – 210,000 light years – Distance to the Small Magellanic Cloud
- 2.8 Zm – 300,000 light years – Distance to the Intergalactic Wanderer, one of the most distant globular clusters of Milky Way
- 8.5 Zm – 900,000 light years – Distance to the Leo I Dwarf Galaxy, farthest known Milky Way satellite galaxy
## 10 zettametres

- 24 Zm – 2.5 million light years – Distance to the Andromeda Galaxy
- 30.8568 Zm – 3.2616 million light years – 1 megaparsec
- 40 Zm – 4.2 million light years – Distance to the IC 10, a distant member of the Local Group of galaxies
- 49.2 Zm – 5.2 million light years – Width of the Local Group of galaxies
- 57 Zm – 6 million light years – Diameter of the supergiant elliptical galaxy IC 1101
- 95 Zm – 10 million light years – Distance to the Sculptor Galaxy in the Sculptor Group of galaxies
- 95 Zm – 10 million light years – Distance to the Maffei 1, the nearest giant elliptical galaxy in the Maffei 1 Group
## 100 zettametres

- 140 Zm – 15 million light years – Distance to Centaurus A galaxy
- 250 Zm – 27 million light years – Distance to the Pinwheel Galaxy
- 280 Zm – 30 million light years – Distance to the Sombrero Galaxy
- 570 Zm – 60 million light years – Approximate distance to the Virgo cluster, nearest galaxy cluster
- 620 Zm – 65 million light years – Approximate distance to the Fornax cluster
- 800 Zm – 85 million light years – Approximate distance to the Eridanus cluster
## 1 yottametre

**yottametre**, or

**yottameter**in the US, is a unit of length in the metric system equal to 10

^{24}metres

To help compare different orders of magnitude, this section lists distances starting at 1 Ym.

- 1.2 Ym – 127 million light years – Distance to the closest observed gamma ray burst GRB 980425
- 1.3 Ym – 137 million light years – Distance to the Centaurus Cluster of galaxies, the nearest large supercluster
- 1.9 Ym – 201 million light years – Diameter of the Local Supercluster
- 2.3 Ym – 225 to 250 million light years – Distance light travels in vacuum in one galactic year
- 2.8 Ym – 296 million light years – Distance to the Coma Cluster
- 3.2 Ym – 338 million light years – Distance to the Stephan's Quintet
- 4.7 Ym – 496 million light years – Length of the CfA2 Great Wall, one of the largest observed superstructures in the Universe
- 6.1 Ym – 645 million light years – Distance to the Shapley Supercluster
- 9.5 Ym – 996 million light years – Diameter of the Eridanus Supervoid
## 10 yottametres

- 13 Ym – 1.38 billion light-years – Length of the Sloan Great Wall
- 18 Ym – redshift 0.16 – 1.9 billion light-years – Distance to the quasar 3C 273
- 33 Ym – 3.5 billion light-years – Maximum distance of the 2dF Galaxy Redshift Survey
- 37.8 Ym – 4 billion light-years – Length of the Huge-LQG
- 75 Ym – redshift 0.95 – 8 billion light-years – Approximate distance to the supernova SN 2002dd in the Hubble Deep Field North
- 85 Ym – redshift 1.6 – 9 billion light-years – Approximate distance to the gamma ray burst GRB 990123
- 94.6 Ym – 10 billion light-years – Approximate distance to quasar OQ172
- 94.6 Ym – 10 billion light-years – Length of the Hercules–Corona Borealis Great Wall, one of the largest and most massive known cosmic structure
## 100 yottametres

Distances longer than 100 Ym

- 124 Ym – redshift 7.54 – 13.1 billion light years – Light travel distance to the quasar ULAS J1342+0928, the most distant known quasar as of 2017
- 130 Ym – redshift 1000 – 13.8 billion light years – Distance to the source of the cosmic microwave background radiation; radius of the observable universe measured as a LTD
- 260 Ym – 27.4 billion light years – Diameter of the observable universe
- 440 Ym – 46 billion light years – Radius of the universe measured as a comoving distance
- 590 Ym – 62 billion light years – Cosmological event horizon: the largest comoving distance from which light will ever reach us at any time in the future
- 886.48 Ym – 93.7 billion light years – The diameter of the observable universe ; however, there might be unobserved distances that are even greater.
- >1,000 Ym – >105.7 billion light years – Size of universe beyond the cosmic light horizon, depending on its curvature; if the curvature is zero, the value can be infinite as previously mentioned