1 hectometre

The Pyramid of Cheops is 138.8 metres high.

British driver location sign and location marker post on A38 in the West Midlands. The location marker posts are installed at 100 metre intervals

To compare different orders of magnitude this page lists lengths between 100 metres and 1000 metres (1 kilometre).

Distances shorter than 100 metres

Conversions

100 metres (sometimes termed a hectometre) 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 mediumwave radio frequency, 3 MHz
• 100 metres — Spacing of location marker posts on British motorways.
• 138.8 metres — height of the Great Pyramid of Giza (Pyramid of Cheops)
• 139 metres — height of the world's tallest roller coaster, Kingda Ka^[1]
• 187 metres— shortest wavelength of the broadcast radio AM band, 1600 kHz
• 202 metres — length of the Széchenyi Chain Bridge connecting Buda and Pest
• 244 metres — height of the City Gate building in Ramat-Gan, Israel
• 320.75 metres — height of the Eiffel Tower(including antenna) ^[2]
• 328 metres — height of Auckland's Sky Tower, the tallest free-standing structure in the Southern Hemisphere^[when?]
• 340 metres — distance sound travels in air in one second; see speed of sound
• 341 metres — height of the world's tallest bridge, the Millau Viaduct^[when?]
• 390 metres — height of the Empire State Building
• 400–500 metres — approximate heights of the world's tallest skyscrapers of the past 70 years.^[when?]
• 443 metres — height of the Willis Tower (formerly the Sears Tower), the tallest skyscraper in the United States^[when?]
• 458 metres — length of the Knock Nevis, the world's largest supertanker
• 509 metres — height of the Taipei 101 building, the tallest skyscraper in the world^[when?]
• 553 metres — height of the CN Tower, the tallest tower and freestanding structure in the world^[when?]
• 541 metres (1776 ft) — height of the planned Freedom Tower at the World Trade Center site^[when?]
• 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^[when?]
• 646 metres — height of the Warsaw radio mast, the world's tallest structure until its collapse in 1991^{[citation needed]}
• 828 metres — height of Burj Khalifa, world's tallest structure on 17 January 2009^[3]
• 1000 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 (110 yards)
• 91.5 metres – 137 metres — length of a soccer field^{[citation needed]}
• 105 metres — length of a typical football field
• 109.73 metres — total length of an American football field (120 yards, including the end zones)
• 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 (150 yards)

Nature

• 115.5 metres — height of the world's tallest tree in 2007, the Hyperion sequoia^{[citation needed]}
• 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 (Venezuela)

Astronomical

• 270 metres — length of 99942 Apophis, the smallest known asteroid
• 540 metres — length of 25143 Itokawa,^[4] the smallest asteroid visited by a spacecraft^{[citation needed]}

Distances longer than 1 kilometre

See also

• hectometre

Click on the thumbnail image to jump to the desired Human-scale order of length magnitude article: top-left is 1E-6 m, lower-right is 1E5 m.

Notes

1. ^ "Kingda Ka (Six Flags Great Adventure)". Archived from the original on 2009-04-25. http://www.rcdb.com/id2832.htm. Retrieved 2009-04-18. 
2. ^ "Tour Eiffel". http://www.paris.org/Monuments/Eiffel/. Retrieved 15 September 2010. 
3. ^ "Burj Dubai all set for 09/09/09 soft opening". Emirates Business 24-7. http://www.business24-7.ae/articles/2009/1/pages/01182009_63dc3a90c9a848219058be301f3f7ded.aspx. Retrieved 17 January 2009. 
4. ^ Fujiwara, Akira; et al (2006-06-02). "The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa". Science 312 (5778): 1330–1334. doi:10.1126/science.1125841. PMID 16741107. http://www.sciencemag.org/cgi/content/abstract/312/5778/1330. Retrieved 2009-04-20.