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An international population screening ratio comparing body weight relative to squared height.
Use our verified, free in-browser BMI Calculator to run scenarios and export PDF reports.
Devised by 19th-century Belgian mathematician Adolphe Quetelet, BMI categorizes individuals into Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), and Obese (≥30).
For South Asian populations, revised clinical guidelines set lower thresholds (Healthy 18.5–22.9, Overweight 23–24.9, Obese ≥25) due to increased cardiometabolic risks at lower body weights.
Calculates weight-to-height ratio normalized by square meters.
Mass in kilograms (or lbs × 0.4536).
Height in meters (cm ÷ 100).