1 decametre

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For the amateur radio band, see 10-meter band.

A Blue whale has been measured as 33 metres long; this drawing compares its length to that of a human diver and a dolphin

To help compare different orders of magnitude this page lists lengths between 10 metres and 100 metres.

[edit] Conversions

10 metres (very rarely termed a decametre which is abbreviated as dam) is equal to:

10 metres — wavelength of the highest shortwave radio frequency, 30 M Hz
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 M Hz
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
55 metres — height of the Leaning Tower of Pisa
60 metres — height of Pyramid of Djoser^{[citation needed]}
64 metres — wingspan of a Boeing 747-400
70 metres — length of the Bayeux Tapestry
70 metres — width of a typical football field
88.40 metres — wingspan of the Antonov An-225 transport aircraft
100 metres — wavelength of the lowest shortwave radio frequency, 3 MHz

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 (50 feet)
18.44 metres — distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches)^[1]
20 metres — length of cricket pitch (22 yards)^[2]
27.43 metres — distance between bases on a baseball field (90 feet)
28 metres — length of a standard FIBA basketball court
28.65 metres — length of an NBA basketball court (94 feet)
49 metres — width of an American football field (53⅓ yards)
59.436 metres — width of a Canadian football field (65 yards)
70 metres — typical width of soccer field
91 metres — length of American football field (100 yards, measured between the goal lines)

10 metres — average length of human digestive tract^{[citation needed]}
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 — longest measured length of a blue whale,^[3] 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^{[citation needed]}
40 metres — average depth beneath the seabed of the Channel tunnel^{[citation needed]}
52 metres — height of Niagara Falls^[4]

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 d 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