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Multiple BSA formulas & Integrated Dosage Calculator

Body surface area (BSA): measured or calculated surface area of a human body. The BSA is frequently used in determining the dosage of medications with a narrow therapeutic index, such as chemotherapeutic agents. The four most common equations used to calculate the BSA are included in this calculator. Results can be exported in pdf format.



 (Optional)  Dose: 


1) DuBois D, DuBois DF. A formula to estimate the approximate surface area if height and weight be known.  Arch Int Med 1916;17:863-71.

Equation:  BSA (m2) = 0.007184 x Height(cm)0.725 x Weight(kg)0.425

2) Gehan EA, George SL. Estimation of human body surface area from height and weight. Cancer Chemother Rep 1970;54:225-35.

Equation:  BSA (m2) = 0.0235 x Height(cm)0.42246 x Weight(kg)0.51456

3) Haycock GB, Schwartz GJ, Wisotsky DH. Geometric method for measuring body surface area: A height-weight formula validated in infants, children and adults.  J Pediatr 1978;93:62-6.

 Equation:  BSA (m2) = 0.024265 x Height(cm)0.3964 x Weight(kg)0.5378

4) Mosteller RD. Simplified calculation of body-surface area. N Engl J Med 1987;317:1098.

Equation:  BSA (m2) = SQR RT ( [Height(cm) x Weight(kg) ]/ 3600 )



Recommended references/reading:

Verbraecken J, Van de Heyning P, De Backer W, Van Gaal L. Body surface area in normal-weight, overweight, and obese adults. A comparison study. Metabolism. 2006 Apr;55(4):515-24. 

"Body surface area prediction with the commonly used DuBois formula underestimated BSA in obese patients by as much as 3% (male) to 5% (female)."

"The Du Bois formula was challenged in 1970 by Gehan and George who directly measured the skin surface area of 401 individuals. They found that the Du Bois formula over-estimated body surface area by 15% in ~15% of cases..." - See citation

"We recommend the Gehan-George equation, however, because it is based on direct measurements in over 400 subjects, including both children and adults. "


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