Adjusted Body Weight Calculator

Calculate adjusted body weight for obese patients. Used in clinical nutrition for drug dosing and calorie calculations.

⚖️ Adjusted Body Weight

Actual Weight (kg)

Height (cm)

Sex

Adjustment Factor

Results

Ideal Body Weight (Devine)65.9 kg

Adjusted Body Weight79.6 kg

Excess Weight34.1 kg

💡 What Is Adjusted Body Weight?

Adjusted Body Weight (ABW) = IBW + factor × (Actual Weight − IBW). The standard adjustment factor is 0.4, meaning 40% of excess weight is metabolically active. Ideal Body Weight (IBW) uses the Devine formula.

ABW is used when a patient exceeds their IBW by more than 30%. It provides a more accurate weight for calculating drug doses (antibiotics, chemotherapy), calorie needs (TPN), and creatinine clearance.

100 kg patient, 170 cm male: IBW = 66.5 kg, ABW = 66.5 + 0.4 × (100 − 66.5) = 79.9 kg.