Calculates Body Mass Index from height and weight, with standard WHO adult weight-status categories.
BMI is a screening measure, not a diagnostic tool — it does not directly measure body fat and may misclassify muscular or elderly patients. Categories shown follow WHO adult thresholds (underweight <18.5, normal 18.5–24.9, overweight 25–29.9, obese ≥30) and are not validated for children; use age- and sex-specific growth charts for pediatric patients.