Defaults: 1X 2X 3X 4X      
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Body Surface Area
Height: in    cm
Weight: lbs  kgs
BSA: m2
Body Surface Area
BSA(m2) =
Dubois and Dubois : = 0.20247 x height (m) 0.725 x weight (kg) 0.425
Haycock : = 0.024265 x height (cm) 0.3964 x weight (kg) 0.5378
Gehan & George : = 0.0235 x height (cm) 0.42246 x weight (kg) 0.51456
Boyd : = 0.0003207 x height (cm) 0.3 x weight (g) 0.7285 - (0.0188 x log(weight(g)))
Mosteller: = square root ( (height (cm) x weight (kg))/ 3600)
How to calculate a BSA.
Step 1: Obtain the weight and height of the patient. Enter the weight and height along with the unit values for the weight and height.  The formula listed above is used to calculate the Body Surface Area (BSA).
Check Normal Values by BSA
DuBois D, DuBois EF. A formula to estimate the approximate surface area if height and weight be known. Arch Int Med 1916 17:863-71.
Haycock GB, Schwartz GJ, Wisotsky DH. Geometric method for measuring body surface area: A height weight formula validated in infants, children and adults. The Journal of Pediatrics 1978 (93):1:62-66.
Gehan EA, George SL. Estimation of human body surface area from height and weight. Cancer Chemother Rep 1970 54:225-35.
Boyd E. The growth of the surface area of the human body. Minneapolis: University of Minnesota Press, 1935.
Mosteller RD. Simplified Calculation of Body Surface Area. N Engl J Med . 1987 Oct 22;317(17):1098. (letter)

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