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Calculate your Body Surface Area (BSA) using three established formulas: Mosteller, DuBois, and Haycock. BSA is used in medicine to calculate drug dosages.
BSA Formulas:
Mosteller: BSA = sqrt(Height(cm) × Weight(kg) / 3600)
DuBois: BSA = 0.007184 × H^0.725 × W^0.425
Haycock: BSA = 0.024265 × H^0.3964 × W^0.5378
Result in square meters (m²). Average adult BSA is 1.7-1.9 m².
Body surface area (BSA) is the measured or calculated surface area of a human body in square meters. The average adult BSA is approximately 1.73 m2 for women and 1.9 m2 for men.
BSA is used to calculate appropriate drug doses, particularly for chemotherapy agents, where dosing by BSA reduces variation in drug exposure between patients of different sizes compared to weight-based dosing.
The Haycock formula is considered most accurate for children. The DuBois formula is historically the most widely used. The Mosteller formula is popular in clinical practice due to its simplicity. All give similar results for average adults.
BMI (Body Mass Index) is a ratio of weight to height squared used for population health screening. BSA measures the actual external surface area of the body and is primarily used for medical drug dosing and burn assessment.
Yes. The Rule of Nines uses BSA percentages to estimate the extent of burns. The head and each arm represents 9%, each leg 18%, the front and back of the trunk 18% each, and the genitalia 1%.
The average BSA is approximately 1.73 m2 for women and 1.9 m2 for men, though this varies significantly with height and weight. Children have smaller BSA ranging from about 0.25 m2 at birth to adult values by late adolescence.