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 <5^th percentile for age
Normal weight	BMI 18.5 to <25	BMI ≥5^th to <85^th percentile
Overweight	BMI 25 to <30	BMI ≥85^th to <95^th percentile
Obesity
Class I obesity	BMI ≥30 to <35	BMI ≥95^th percentile to <120% of the 95^th percentile or BMI ≥30 to <35 (whichever is lower)
Class II obesity	BMI ≥35 to <40	BMI ≥120 to 140% of the 95^th percentile or a BMI ≥35 to <40 (whichever is lower)*
Class III obesity	BMI ≥40	BMI ≥140% of the 95^th percentile or a BMI ≥40 (whichever is lower)

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.

* 120% of the 95^th percentile corresponds to approximately the 98^th percentile or BMI Z-score ≥2 (ie, 2 standard deviations above the mean).

References:

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.
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.

Graphic 78725 Version 13.0

خرید پکیج

Weight categories for adults and youth