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Weight categories for adults and youth

Weight categories for adults and youth
Category Adults
18 years and older[1]
(kg/m2)		 Youth 2 to 18 years
(CDC, AAP, IOM, ES, IOTF[2,3])
Underweight BMI <18.5 BMI <5th percentile for age
Normal weight BMI 18.5 to 24.9 BMI ≥5th to <85th percentile
Overweight BMI 25 to 29.9 BMI ≥85th to <95th percentile
Obesity BMI ≥30 BMI ≥95th percentile
Severe obesity BMI ≥35 (class II obesity) BMI ≥120% of the 95th percentile or a BMI ≥35 (whichever is lower)*[4,5]
BMI ≥40 (class III obesity) BMI ≥140% of the 95th percentile or a BMI ≥40 (whichever is lower)[5]

CDC: Centers for Disease Control and Prevention; AAP: American Academy of Pediatrics; IOM: Institute of Medicine; ES: Endocrine Society; IOTF: International Obesity Task Force; BMI: body mass index.

* In children, several definitions of severe obesity have been used. The most widely accepted is BMI ≥120% of the 95th percentile or a BMI ≥35 kg/m2 (whichever is lower)[3]. This corresponds to approximately the 99th percentile or BMI Z-score ≥2.33 (ie, 2.33 standard deviations above the mean).
References:
  1. Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults--The Evidence Report. National Institutes of Health. Obes Res 1998; 6 Suppl 2:51S.
  2. Barlow SE, Expert Committee. Expert committee recommendations regarding the prevention, assessment, and treatment of child and adolescent overweight and obesity: summary report. Pediatrics 2007; 120 Suppl 4:S164.
  3. Wang Y. Cross-national comparison of childhood obesity: the epidemic and the relationship between obesity and socioeconomic status. Int J Epidemiol 2001; 30:1129.
  4. Kelly AS, Barlow SE, Rao G, et al. Severe Obesity in Children and Adolescents: Identification, Associated Health Risks, and Treatment Approaches: A Scientific Statement From the American Heart Association. Circulation 2013.
  5. Skinner AC, Skelton JA. Prevalence and Trends in Obesity and Severe Obesity Among Children in the United States, 1999-2012. JAMA Pediatr 2014.
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