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Body Surface Area Calculator

DuBois BSA formula for drug dosing

Body Surface Area Calculator

Body Surface Area (BSA) is the measured or calculated surface of a human body. It is used in clinical medicine primarily for calculating chemotherapy dosages, cardiac index, and burn surface area. BSA is more accurate than weight alone for drug dosing because it correlates better with metabolic rate.

  1. 1DuBois & DuBois (1916): BSA = 0.007184 × height^0.725 × weight^0.425
  2. 2Mosteller (1987): BSA = √(height × weight / 3600)
  3. 3Height in cm, weight in kg; BSA in m²
  4. 4Average adult BSA: 1.73 m² (used as reference in eGFR)
70 kg, 175 cm (DuBois)=BSA ≈ 1.84 m²
60 kg, 165 cm (Mosteller)=BSA ≈ 1.61 m²
GroupAverage BSAWeight Range
Neonate0.25 m²~3.5 kg
Child (10 yr)1.14 m²~32 kg
Female adult1.60 m²~60 kg
Male adult1.90 m²~80 kg
Obese adult2.20+ m²>120 kg
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