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Healthy weight range = height(m)² × [18.5, 24.9]. The range can span 20–30 lbs for average adults. BMI is a population screening tool—athletes, the elderly, and pregnant women may have misleading BMI values. Waist circumference adds context: above 35 inches (women) or 40 inches (men) correlates with metabolic risk independently of BMI.
BMI 18.5–24.9 mapped to weight for height (lb).
~122–164 lb