1 hectometre

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The Pyramid of Cheops is 138.8 metres high.

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

[edit] Conversions

100 metres (sometimes termed a hectometre) is equal to:

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
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?]
341 metres — height of the world's tallest bridge, the Millau Viaduct^[when?]
390 metres — height of the Empire State Building
400–800 metres — approximate heights of the world's tallest skyscrapers of the past 80 years.^[when?]
458 metres — length of the Knock Nevis, the world's largest supertanker
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

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)

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)

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]}

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.

v t e Orders of magnitude for length in E notation
shorter than one metre:
<−24	−24	−23	−22	−21	−20	−19	−18	−17	−16	−15	−14	−13	−12	−11	−10	−9	−8	−7	−6	−5	−4	−3	−2	−1	0
longer than 1 metre:
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26