1 decimetre

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An adult human foot is about 28 centimetres long.

To help compare different orders of magnitude this page lists lengths between 10 centimetres and 100 centimetres (10⁻¹ metre and 1 metre).

[edit] Conversions

10 centimetres (abbreviated to 10 cm) is equal to

10 cm = 1.0 dm^{[note 1]} – 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

10.16 cm = 1.016 dm — 1 hand used in measuring height of horses (4 inches)
12 cm = 1.2 dm — diameter of a Compact Disc (CD) (= 120 mm)
15 cm = 1.5 dm — length of a Bic pen with cap on
22 cm = 2.2 dm — diameter of a typical soccer ball
30.48 cm = 3.048 dm — 1 foot
30 cm = 3 dm — typical school-use ruler length (= 300 mm)
60 cm = 6 dm — standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)
90 cm = 9 dm — average length of a rapier, a fencing sword^[1]
91.44 cm is one yard
Cigarettes 100 mm (4 in) in length

10 cm = 1 dm — diameter of the human cervix upon entering the second stage of labour^{[citation needed]}
14 cm = 1.4 dm — length of average human penis^{[citation needed]}
15 cm = 1.5 dm — approximate size of largest beetle species^{[citation needed]}
29 cm = 2.9 dm — length of average human foot^{[citation needed]}
29.98 cm = distance light travels in one nanosecond
31 cm = 3.1 dm — wingspan of largest butterfly species Ornithoptera alexandrae^{[citation needed]}
50 to 65 cm — a pizote's tail^{[citation needed]}
66 cm — length of the longest pine cones (produced by the Sugar Pine^[2])

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.

^ ^a ^b ^c m is an abbreviation of metre; cm of centimetre; dm of decimetre; m² is short for square metre; m³ is short for cubic metre

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