Clinical BMI & Weight Calculator

Calculate BMI, ideal body weight, adjusted body weight, and clinical weight targets.

Height (cm) (cm)

Weight (kg) (kg)

Sex

Frame size

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Worked Examples

Example 1: 175cm male, 85kg

BMI=27.8, IBW=75.2kg

Result: Overweight — AdjBW=79.3kg

Used for drug dosing in obese patients

Example 2: 160cm female, 45kg

BMI=17.6, IBW=54kg

Result: Underweight

% IBW = 83% — nutritional support consideration

Frequently Asked Questions

What is ideal body weight used for?

Drug dosing (aminoglycosides, vancomycin, chemotherapy), mechanical ventilator tidal volume (6 ml/kg IBW), and nutritional assessment. Do not use actual weight in obese patients for these calculations.

BMI limitations in clinical practice?

BMI doesn't distinguish muscle from fat, or body composition. Muscular athletes may be classified as overweight. Elderly may have normal BMI despite sarcopenia (muscle loss). Waist circumference adds important information.