Body Surface Area (BSA) Metric (kg/cm) Imperial (lbs/in) Calculation Formula Du Bois Formula Mosteller Formula Haycock Formula Gehan & George Formula Weight (kg) Height (cm) Weight (lbs) Height (inches) Calculate About Body Surface Area BSA is used in medical practice for: Chemotherapy dosing Cardiac index calculations Burn assessment Pediatric medication Normal Range: Average adult BSA ≈ 1.7 m²