Body Weight
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Body Weight

Human body weight refers to a person's mass or weight. Body weight is measured in kilograms, a measure of mass, throughout the world, although in some countries such as the United States it is measured in pounds, or as in the United Kingdom, stones and pounds. Most hospitals, even in the United States, now use kilograms for calculations, but use kilograms and pounds together for other purposes.

Strictly speaking, body weight is the measurement of weight without items located on the person. Practically though, body weight may be measured with clothes on, but without shoes or heavy accessories such as mobile phones and wallets and using manual or digital weighing scales. Excess or reduced body weight is regarded as an indicator of determining a person's health, with body volume measurement providing an extra dimension by calculating the distribution of body weight.

Estimation in children

An example of a half unfolded Broselow tape.

There are a number of methods to estimate weight in children for circumstances (such as emergencies) when actual weight cannot be measured. Most involve a parent or health care provider guessing the child's weight through weight-estimation formulas. These formulas base their findings on the child's age and tape-based systems of weight estimation. Of the many formulas that have been used for estimating body weight, some include the APLS formula, the Leffler formula, and Theron formula.[1] There are also several types of tape-based systems for estimating children's weight, with the most well-known being the Broselow tape.[2] The Broselow tape is based on length with weight read from the appropriate color area. Newer systems, such as the PAWPER tape, make use of a simple two-step process to estimate weight: the length-based weight estimation is modified according to the child's body habitus to increase the accuracy of the final weight prediction.[3]

The Leffler formula is used for children 0-10 years of age.[1] In those less than a year old it is

and for those 1-10 years old it is

where m is the number of kilograms the child weighs and am and ay respectively are the number of months or years old the child is.[1]

The Theron formula is

where m and ay are as above.[1]


Body weight varies throughout the day, as the amount of water in the body is not constant. It changes frequently due to activities such as drinking, urinating, or exercise.[4][5] Professional sports participants may deliberately dehydrate themselves to enter a lower weight class, a practice known as weight cutting.[6]

Ideal body weight

Ideal body weight (IBW) was initially introduced by Devine in 1974 to allow estimation of drug clearances in obese patients;[7] researchers have since shown that the metabolism of certain drugs relates more to IBW than total body weight.[8] The term was based on the use of insurance data that demonstrated the relative mortality for males and females according to different height-weight combinations.

The most common estimation of IBW is by the Devine formula; other models exist and have been noted to give similar results.[8] Other methods used in estimating the ideal body weight are body mass index and the Hamwi method. The IBW is not the perfect fat measurement as it does not show the fat or muscle percentage in one's body. For example, athletes' results show that they are overweight when they are actually very fit and healthy. Machines like the dual-energy X-ray absorptiometry (DXA) can accurately measure the percentage and weight of (fat, muscle, bone) in a body.

Devine formula

The Devine formula for calculating ideal body weight in adults is as follows:[8]

  • Male ideal body weight = 50 kilograms (110 lb) + 0.9 kilograms (2.0 lb) × (height (cm) - 152)
  • Female ideal body weight = 45.5 kilograms (100 lb) + 0.9 kilograms (2.0 lb) × (height (cm) - 152)

Hamwi method

The Hamwi method is used to calculate the ideal body weight of the general adult:[9]

  • Male ideal body weight = 48 kilograms (106 lb) + 1.1 kilograms (2.4 lb) × (height /cm - 152)
  • Female ideal body weight = 45.4 kilograms (100 lb) + 0.9 kilograms (2.0 lb) × (height /cm - 152)



Participants in sports such as boxing, mixed martial arts, wrestling, rowing, judo, Olympic weightlifting, and powerlifting are classified according to their body weight, measured in units of mass such as pounds or kilograms. See, e.g., wrestling weight classes, boxing weight classes, judo at the 2004 Summer Olympics, boxing at the 2004 Summer Olympics.


Ideal body weight, specifically the Devine formula, is used clinically for multiple reasons, most commonly in estimating renal function in drug dosing, and predicting pharmacokinetics in morbidly obese patients.[10][11]

Average weight around the world

By region

Region Adult population
Average weight Overweight population /
total population
Africa 535 60.7 kg (133.8 lb) 28.9% [12]
Asia 2,815 57.7 kg (127.2 lb) 24.2% [12]
Europe 606 70.8 kg (156.1 lb) 55.6% [12]
Latin America and the Caribbean 386 67.9 kg (149.7 lb) 57.9% [12]
North America 263 80.7 kg (177.9 lb) 73.9% [12]
Oceania 24 74.1 kg (163.4 lb) 63.3% [12]
World 4,630 62.0 kg (136.7 lb) 34.7% [12]

By country

Country Average male weight Average female weight Sample population /
age range
Methodology Year Source
Brazil 72.7 kg (160.3 lb) 62.5 kg (137.8 lb) 20-74 Measured 2008-2009 [13]
Canada 80.3 kg (177 lb) Measured []
Chile 77.3 kg (170.4 lb) 67.5 kg (148.8 lb) 15+ Measured 2009-2010 [14]
Finland 82.1 kg (181 lb) Measured []
France 77.1 kg (170 lb) 62.7 kg (138 lb) 15+ Measured 2005 [15]
Germany 82.4 kg (181.7 lb) 67.5 kg (148.8 lb) 18+ Measured 2005 [16]
South Korea 68.6 kg (151.2 lb) 56.5 kg (124.6 lb) 18+ Measured 2007 [17]
Sweden 81.9 kg (180.6 lb) 66.7 kg (147.0 lb) 16-84 Measured 2003-2004 [18]
UK - Wales 84.0 kg (185.2 lb) 69.0 kg (152.1 lb) 16+ Measured 2009 [19]
United States 88.8 kg (195.8 lb) 76.4 kg (168.4 lb) 20+ Measured 2011-2014 [20]

Global statistics

Researchers at the London School of Hygiene & Tropical Medicine published a study of average weights of adult humans in the journal BMC Public Health and at the United Nations conference Rio+20.[21]

See also


  1. ^ a b c d So TY, Farrington E, Absher RK (June 2009). "Evaluation of the accuracy of different methods used to estimate weights in the pediatric population". Pediatrics. 123 (6): e1045-51. doi:10.1542/peds.2008-1968. PMID 19482737.
  2. ^ Lubitz, Deborah; Seidel, JS; Chameides, L; Luten, RC; Zaritsky, AL; Campbell, FW (1988). "A rapid method for estimating weight and resuscitation drug dosages from length in the pediatric age group". Ann Emerg Med. 17 (6): 576-81. doi:10.1016/S0196-0644(88)80396-2. PMID 3377285.
  3. ^ Wells, Mike (2011). "Clinical: The PAWPER Tape". Sanguine. 1 (2). Retrieved 2013.
  4. ^ Smith, Jessica (16 May 2013). "Stop Hating the Scale". Shape Magazine. Retrieved 2017.
  5. ^ Talens, Dick (30 November 2014). "What the Number on the Scale Really Means". Greatist. Retrieved 2017.
  6. ^ Lee, Orion. "Making Weight: Why Fighters Cut Weight and 3 Tips for Doing It". Breaking Muscle. Retrieved 2017.
  7. ^ Devine, Ben J (1974). "Gentamicin therapy". Drug Intell Clin Pharm. 8 (11): 650-5. doi:10.1177/106002807400801104.
  8. ^ a b c Pai, Manjunath P; Paloucek, Frank P (September 2000). "The Origin of the "Ideal" Body Weight Equations". The Annals of Pharmacotherapy. 34 (9): 1066-1069. doi:10.1345/aph.19381. PMID 10981254.
  9. ^ Geriatric Nutrition Handbook. p. 15. ISBN 978-0412136412.
  10. ^ Jones, Graham RD (2011). "Estimating Renal Function for Drug Dosing Decisions". The Clinical Biochemist Reviews. 32 (2): 81-88. PMC 3100285. PMID 21611081.
  11. ^ van Kraligen, S; van de Garde, EMW; Knibbe, CAJ; Diepstraten, J; Wiezer, MJ; van Ramshorst, B; Dongen, EPA (2011). "Comparative evaluation of atracurium dosed on ideal body weight vs. total body weight in morbidly obese patients". British Journal of Clinical Pharmacology. 71 (1): 34-40. doi:10.1111/j.1365-2125.2010.03803.x. PMC 3018024. PMID 21143499.
  12. ^ a b c d e f g Walpole, Sarah C; Prieto-Merino, David; Edwards, Phil; Cleland, John; Stevens, Gretchen; Roberts, Ian; et al. (18 June 2012). "The weight of nations: an estimation of adult human biomass". BMC Public Health. BMC Public Health 2012, 12:439. 12 (1): 439. doi:10.1186/1471-2458-12-439. PMC 3408371. PMID 22709383. Retrieved 2012.
  13. ^ Do G1, em São Paulo (2010-08-27). "G1 - Metade dos adultos brasileiros está acima do peso, segundo IBGE - notícias em Brasil". Retrieved .
  14. ^ Encuesta Nacional de Salud 2009-2010 Archived 12 March 2011 at the Wayback Machine. (p. 81)
  15. ^ Commission européenne, Eurobaromètre EB64.3 - calculs SPF Économie Direction générale Statistique et Information économique
  16. ^ © wissenmedia in der inmediaONE] GmbH, Gütersloh/München. "Bauer sucht Frau aus dem Lexikon" (in German). Retrieved .
  17. ^ "The Chosun Ilbo (English Edition): Daily News from Korea - Average Korean Now Overweight". 2009-07-27. Retrieved .
  18. ^ "6 kilo mer man och 4 kilo mer kvinna" (in Swedish). Archived from the original on 2014-02-27. Retrieved .
  19. ^ "The Welsh Health Survey 2009, p. 58" (PDF). 2010-09-15. Retrieved .
  20. ^ "Anthropometric Reference Data for Children and Adults: United States, 2011-2014" (PDF). Retrieved .
  21. ^ Data extracted from "The world's fattest countries: how do you compare?". The Daily Telegraph. 21 June 2012. Retrieved 2016.

External links

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