While there is significant variation in anatomical proportions between people, there are many references to body proportions that are intended to be canonical, either in art, measurement, or medicine.
In measurement, body proportions are often used to relate two or more measurements based on the body. A cubit, for instance, is supposed to be six palms. While convenient, these ratios may not reflect the physiognomic variation of the individuals using them.
Similarly, in art, body proportions are the study of relation of human or animal body parts to each other and to the whole. These ratios are used in veristic depictions of the figure, and also become part of an aesthetic canon within a culture.
Basics of human proportions 
It is important in figure drawing to draw the human figure in proportion. Though there are subtle differences between individuals, human proportions fit within a fairly standard range, though artists have historically tried to create idealised standards, which have varied considerably over different periods and regions. In modern figure drawing, the basic unit of measurement is the 'head', which is the distance from the top of the head to the chin. This unit of measurement is reasonably standard, and has long been used by artists to establish the proportions of the human figure. Ancient Egyptian art used a canon of proportion based on the "fist", measured across the knuckles, with 18 fists from the ground to the hairline on the forehead. This was already established by the Narmer Palette from about the 31st century BC, and remained in use until at least the conquest by Alexander the Great some 3,000 years later.
The proportions used in figure drawing are:
- An average person, is generally 7-and-a-half heads tall (including the head).
- An ideal figure, used when aiming for an impression of nobility or grace, is drawn at 8 heads tall.
- A heroic figure, used in the heroic for the depiction of gods and superheroes, is eight-and-a-half heads tall. Most of the additional length comes from a bigger chest and longer legs.
Western ideal 
Leg-to-body ratio 
A study using Polish participants by Sorokowski found 5% longer legs than an individual used as a reference was considered most attractive. The study concluded this preference might stem from the influence of leggy runway models. The Sorokowski study was criticized for using a picture of the same person with digitally altered leg lengths which Marco Bertamini felt were unrealistic.
Another study using British and American participants, found "mid-ranging" leg-to-body ratios to be most ideal.
A study by Swami et al. of American men and women showed a preference for men with legs as long as the rest of their body and women with 40% longer legs than the rest of their body The researcher concluded that this preference might be influenced by American culture where long leg women are portrayed as more attractive. The Swami et al. study was criticized for using a picture of the same person with digitally altered leg lengths which Marco Bertamini felt were unrealistic. Bertamini also criticized the Swami study for only changing the leg length while keeping the arm length constant. Bertamini's own study which used stick figures mirrored Swami's study, however, by finding a preference for leggier women.
Muscle men and thin women 
A 1999 study found that "the (action) figures have grown much more muscular over time, with many contemporary figures far exceeding the muscularity of even the largest human bodybuilders," reflecting an American cultural ideal of a super muscular man. Also, female dolls reflect the cultural ideal of thinness in women.
Japanese ideal 
Japanese ideals for body proportions differ from Western ideals. The most prominent example of this is moe, characteristics of which include large eyes, small noses, tall irises[clarification needed], thin limbs, large heads, and neotenized faces. Manga characters are usually sized to be 5.7 to 6.5 heads tall. Another example of the Japanese ideal is the concept of the gracilized man: in contemporary Japanese society, bishōnen, literally "beautiful boys", are "delicate", "svelte" and "beautiful" males who are drawn to appeal to "adolescent girls".
Leonardo da Vinci 
Leonardo da Vinci believed that the ideal human proportions were governed by the harmonious proportions that he believed governed the universe such that the ideal man would fit cleanly into a circle as in his famed "Vitruvian man" drawing.
- Gottfried Bammes: Studien zur Gestalt des Menschen. Verlag Otto Maier GmbH, Ravensburg 1990, ISBN 3-473-48341-9.
See also 
- Smith, W. Stevenson, and Simpson, William Kelly. The Art and Architecture of Ancient Egypt, pp. 12-13 and note 17, 3rd edn. 1998, Yale University Press (Penguin/Yale History of Art), ISBN 0300077475
- Fiona Macrae (27 December 2009). "Skin deep: Beautiful faces have Miss Average proportions". Daily Mail. Retrieved 2011-07-31. "All were head shots of the same person with different distances from eyes to mouth or between the eyes. She was at her most attractive when the space between her pupils was just under half, or 46 per cent, of the width of her face from ear to ear. The other perfect dimension was when the distance between her eyes and mouth was just over a third, or 36 per cent, of the overall length of her face from hairline to chin. ..."
- Sorokowski P., Pawlowski B. (Jan. 3, 2008). "Adaptive preferences for leg length in a potential partner". Evolution and Human Behavior 29. pp. 86–91. Retrieved 2010-03-29.
- Sorokowski, P. (2010). Attractiveness of Legs Length in Poland and Great Britain. In Human Ecology. 31(3):148
- Bertamini, M. (2009). THE EFFECT OF LEG LENGTH ON PERCEIVED ATTRACTIVENESS OF SIMPLIFIED STIMULI. In Social, Evolutionary, and Cultural Psychology. 3(3).
- Frederick, D. A. et al. (2010). The influence of leg-to-body ratio (LBR) on judgments of female physical attractiveness: Assessments of computer-generated images varying in LBR In Body Image. 7(1):51-55
- Swami, V. et al. (2006). The leg-to-body ratio as a human aesthetic criterion. In Body Image. 3.
- Pope, Harrison; Roberto Olivardia,Amanda Gruber, John Borowiecki (1998-05-26). "Evolving Ideals of Male Body Image as Seen Through Action Toys". International Journal of Eating Disorders (John Wiley & Sons, Inc) 26 (1).
- 電撃萌王 Special May 1, 2006, No. 127 Vol.11 No.8, Media, p. 104 ~ 105
- Crilley, M. Manga Body Proportions. Youtube. Accessed May 2, 2011, from http://www.youtube.com/watch?v=dFuFwpGfbYU&
- Crilley, M. How To Draw Manga Female Body Proportions (Talia from "Brody's Ghost"). Youtube. Accessed May 2, 2011, from http://www.youtube.com/watch?v=_VtBuFYvsW8&
- Buckley (2002). Encyclopedia of Contemporary Japanese Culture. Taylor & Francis. pp. 188, 522, 553. ISBN 0-415-14344-6.
- "Universal Leonardo: Leonardo Da Vinci Online › Essays." Universal Leonardo: Leonardo Da Vinci Online › Welcome to Universal Leonardo. Web. 22 Apr. 2010. <http://www.universalleonardo.org/essays.php?id=563>.