1 hectometre

The Pyramid of Cheops is 138.8 metres high.

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To help 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 (rarely 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
• 299.792 metres is the approximate distance travelled by light in one microsecond

Human-defined scales and structures

• 100 metres — wavelength of the highest mediumwave radio frequency, 3 MHz
• 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
• 300.65 metres — height of the Eiffel Tower^{[Citation needed]}
• 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 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]}
• 818 metres — height of Burj Dubai, world's tallest structure on 17 January 2009^[2]
• 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 metres — length of a Canadian football field
• 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)

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

• 540 metres — length of 25143 Itokawa,^[3] the smallest asteroid visited by a spacecraft^{[Citation needed]}

Distances longer than 1 kilometre

See also

Click on the thumbnail image to jump to the desired Human-scale order of length magnitude article: top-left is 1E-6m, lower-right is 1E5m.

Notes