BSA calculator Formula:
   Mosteller Formula: bsa = √height (cm) × weight (kg) /60
   DuBois & DuBois Formula: bsa = 0.20247 × height (m)^0.725 x weight (kg)^0.425
   Haycock Formula: bsa = 0.024265 x height (cm)^0.3964 x weight (kg)^0.5378
   Gehan and George Formula: bsa = 0.0235 x height (cm)^0.42246 x weight (kg)^0.51456
   Boyd Formula: bsa = 0.0003207 x height (cm)^0.3 x weight (g)^{0.7285 - (0.0188 x log(weight))}

References:
Mosteller RD: Simplified Calculation of Body Surface Area. N Engl J Med 1987 Oct 22;317(17):1098
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 G.B., Schwartz G.J.,Wisotsky D.H. 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.