BMI Calculator
Body Mass Index
Result
BMI Classification (WHO)
| Classification | BMI (kg/m²) |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5–24.9 |
| Overweight | 25.0–29.9 |
| Obesity Class I | 30.0–34.9 |
| Obesity Class II | 35.0–39.9 |
| Obesity Class III | ≥ 40.0 |
Note: BMI is a useful tool for population-level assessment, but has limitations. It does not account for body composition (muscle vs. fat), fat distribution, age, sex or ethnicity. For a complete assessment, consult a healthcare professional. In the United States, the CDC (Centers for Disease Control and Prevention) adopts the WHO BMI classification for adults and provides supplemental guidance on race/ethnicity-specific considerations (e.g., lower BMI thresholds for overweight in Asian American populations).
References
- 1. World Health Organization. "Obesity: Preventing and Managing the Global Epidemic. Report of a WHO Consultation." World Health Organ Tech Rep Ser. 2000;894:i–xii, 1–253. PubMed ↗
- 2. Nuttall FQ. "Body Mass Index: Obesity, BMI, and Health: A Critical Review." Nutr Today. 2015;50(3):117–128. PubMed ↗