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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])
Underweight BMI <18.5 BMI <5th percentile for age
Normal weight BMI 18.5 to <25 BMI ≥5th to <85th percentile
Overweight BMI 25 to <30 BMI ≥85th to <95th percentile (or BMI ≥25 to <30 kg/m2, if lower)
Obesity
  • Class I obesity
 BMI ≥30 to <35 BMI ≥95th percentile to <120% of the 95th percentile (or BMI ≥30 to <35 kg/m2, if lower)
  • Class II obesity
 BMI ≥35 to <40 BMI ≥120 to 140% of the 95th percentile (or BMI ≥35 to <40 kg/m2, if lower)*
  • Class III obesity
 BMI ≥40 BMI ≥140% of the 95th percentile (or BMI ≥40 kg/m2, if lower)

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

* 120% of the 95th percentile corresponds to approximately the 98th percentile or BMI Z-score ≥2 (ie, 2 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. Hampl SE, Hassink SG, Skinner AC, et al. Clinical Practice Guideline for the Evaluation and Treatment of Children and Adolescents With Obesity. Pediatrics 2023; e2022060640.
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