Body Mass Index

Aka: Body Mass Index, BMI, Body Mass Index Calculation

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II. Indication

  1. Used in evaluation of Obesity

III. Advantages

  1. Highly correlated to body fat
  2. May be best method available

IV. Disadvantages

  1. Not accurate in muscular patients (athletes)
  2. Not accurate in pregnancy or Lactation

V. Calculation

  1. BMI = (weight in kilograms) / (height in Meters)^2
  2. BMI = (weight in lbs x 700) / (height in Inches)^2
  3. Approximating the weight at which BMI=27 (Obesity)
    1. Start with 100 pounds
    2. Add 5 pounds for every inch over 5 feet tall
    3. Add 40 pounds
    4. Example: What weight is BMI=27 for 66 inch person?
    5. Answer: 100 + (6x5) + 40 = 170 pounds

VI. Interpretation: Adults (Non-Asian Descent)

  1. BMI <18.5: Underweight
  2. BMI <20: Underweight or endurance athlete
  3. BMI 20 to 22: Ideal Weight
  4. BMI 22 to 25: Healthy Weight
  5. BMI 25: Mild Obesity (WHO Grade 1, 110% Ideal Weight)
  6. BMI 27: Moderate Obesity (120% of Ideal Weight)
  7. BMI 30: Severe Obesity (WHO Grade 2, 130% Ideal Weight)
  8. BMI 40: Morbid Obesity (WHO Grade 3 Obesity or Severe Obesity)

VII. Interpretation: Adults (Asian Descent)

  1. BMI <18.5: Underweight
  2. BMI 18.5 to 23: Healthy Weight
  3. BMI 23 to 27.5: Overweight
  4. BMI 27.5 to 32.5: Class 1 Obesity
  5. BMI 32.5 to 37.5: Class 2 Obesity
  6. BMI >37.5: Class 3 Obesity (Severe Obesity)

VIII. Interpretation: Boys (Derived from CDC BMI charts)

  1. Approximation
    1. Overweight BMI = (Age in years) + 14
  2. Age 10
    1. Mean BMI (50%): 17
    2. At Risk BMI (>85%): 20
    3. Overweight BMI (>95%): 23.5
  3. Age 12
    1. Mean BMI (50%): 18
    2. At Risk BMI (>85%): 22
    3. Overweight BMI (>95%): 25
  4. Age 14
    1. Mean BMI (50%): 19
    2. At Risk BMI (>85%): 23
    3. Overweight BMI (>95%): 27
  5. Age 16
    1. Mean BMI (50%): 20
    2. At Risk BMI (>85%): 25
    3. Overweight BMI (>95%): 29

IX. Interpretation: Girls (Derived from CDC BMI charts)

  1. Approximation
    1. Overweight BMI = (Age in years) + 13
  2. Age 10
    1. Mean BMI (50%): 17
    2. At Risk BMI (>85%): 20
    3. Overweight BMI (>95%): 23
  3. Age 12
    1. Mean BMI (50%): 18
    2. At Risk BMI (>85%): 22
    3. Overweight BMI (>95%): 26
  4. Age 14
    1. Mean BMI (50%): 19
    2. At Risk BMI (>85%): 24
    3. Overweight BMI (>95%): 28
  5. Age 16
    1. Mean BMI (50%): 20
    2. At Risk BMI (>85%): 25
    3. Overweight BMI (>95%): 29

X. Resources

  1. NIH Obesity Education Initiative BMI Calculator
    1. http://www.nhlbisupport.com/bmi/bmicalc.htm
  2. CDC Growth Charts (source for childhood BMIs above)
    1. http://www.cdc.gov/growthcharts
  3. CDC Body Mass Index Information
    1. http://www.cdc.gov/nccdphp/dnpa/obesity/bmi.htm

XI. References

  1. Green (1994) Bright Futures, NCEMCH, p. 266

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Related Studies

Ontology: Body mass index procedure (C0005893)

Definition (MSH) An indicator of body density as determined by the relationship of BODY WEIGHT to BODY HEIGHT. BMI=weight (kg)/height squared (m2). BMI correlates with body fat (ADIPOSE TISSUE). Their relationship varies with age and gender. For adults, BMI falls into these categories: below 18.5 (underweight); 18.5-24.9 (normal); 25.0-29.9 (overweight); 30.0 and above (obese). (National Center for Health Statistics, Centers for Disease Control and Prevention)
Concepts Diagnostic Procedure (T060)
MSH D015992
English Body Mass Index, Index, Body Mass, Quetelets Index, Body mass index, BMI, body mass index (BMI), quetelet index, body mass index, Body mass index procedure, Quetelet Index, Quetelet's Index, Index, Quetelet
Japanese ボディ・マス・インデックス, ﾎﾞﾃﾞｨﾏｽｲﾝﾃﾞｯｸｽ, Quetelet指数, ケトレー指数, 体重指数
Swedish Kroppsmasseindex
Czech BMI, index tělesné hmotnosti, Body mass index
Finnish Painoindeksi
French Index de Quetelet, IMC (Indice de Masse Corporelle), Indice de masse corporelle, Indice de Quetelet, Index de masse corporelle
Russian TELA MASSY INDEKS, KVETELETA INDEKS, КВЕТЕЛЕТА ИНДЕКС, ТЕЛА МАССЫ ИНДЕКС
Italian Indice di Quetelet, Indice di massa corporea
Croatian INDEKS TJELESNE MASE
Polish Wskaźnik masy ciała, BMI
Hungarian Testtömeg index
Norwegian Kroppsmasseindeks, BMI
Portuguese IMC, Índice de Massa Corpórea, Índice de massa corporal, Índice de Massa Corporal, Índice de Quetelet
Spanish Índice de masa corporal, Índice de Masa Corporal, Índice de Quetelet
German Koerpermassenindex, Quetelet-Index, Körpermasse-Index
Dutch BMI, Body-mass index, Quetelet-index
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: Body mass index (C1305855)

Definition (NCI) A general indicator of the body fat an individual is carrying based upon the ratio of weight to height.
Definition (NCI_CDISC) A general indicator of the body fat an individual is carrying based upon the ratio of weight to height. (NCI)
Definition (NCI_NCI-GLOSS) A measure that relates body weight to height. BMI is sometimes used to measure total body fat and whether a person is a healthy weight. Excess body fat is linked to an increased risk of some diseases including heart disease and some cancers.
Concepts Clinical Attribute (T201)
SnomedCT 60621009, 248359001, 162859006, 363807006, 140075008
LNC LP35925-4, MTHU017351
English Quetelet index, BODY MASS INDEX, Quetelet Index, body mass index (physical finding), body mass index, BMI, quetelet index, body mass index (BMI), Quetelet index (observable entity), Body mass index - observation, Body mass index (observable entity), BMI - Body mass index, Body mass index, Body mass index, NOS, Body mass index [dup] (observable entity), Body Mass Index
Spanish índice de Quetelet, índice de Quetelet (entidad observable), IMC, índice de masa corporal (entidad observable), índice de masa corporal, BMI
Derived from the NIH UMLS (Unified Medical Language System)

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