The calculator below computes the total surface area of a human body, referred to as body surface area (BSA). Direct measurement of BSA is difficult, and as such many formulas have been published that estimate BSA. The calculator below provides results for some of the most popular formulas.
Gender
Body Weight
Body Height
feet
inches
OR centimeters
Table of average BSAs
ft^{2}
m^{2}
Newborn child
2.69
0.25
Two-year-old child
5.38
0.5
Ten-year-old child
12.27
1.14
Adult female
17.22
1.6
Adult male
20.45
1.9
BSA is often used in clinical purposes over body weight because it is a more accurate indicator of metabolic mass (the body's need for energy), where metabolic mass can be estimated as fat-free mass since body fat is not metabolically active.^{1} BSA is used in various clinical settings such as determining cardiac index (to relate a person's heart performance to their body size) or dosages for chemotherapy (a category of cancer treatment). While dosing for chemotherapy is often determined using a patient's BSA, there exist arguments against the use of BSA to determine medication dosages that have a narrow therapeutic index – the comparison of the amount of a substance necessary to produce a therapeutic effect, to the amount that causes toxicity.
Below are some of the most popular formulas for estimating BSA, and links to references for each for further detail on their derivations. The most widely used of these is the Du Bois formula, which has been shown to be effective for estimating body fat in both obese and non-obese patients, unlike body mass index. Where BSA is represented in m^{2}, W is weight in kg, and H is height in cm, the formulas are as follows:
Du Bois formula:
BSA = 0.007184 × W^{0.425} × H^{0.725}
Du Bois D, Du Bois EF (Jun 1916). "A formula to estimate the approximate surface area if height and weight be known". Archives of Internal Medicine 17 (6): 863-71. PMID 2520314. Retrieved 2012-09-09.
Mosteller formula:
BSA = = 0.016667 × W^{0.5} × H^{0.5}
Mosteller RD. "Simplified calculation of body-surface area". N Engl J Med 1987; 317:1098. PMID 3657876.
Haycock formula:
BSA = 0.024265 × W^{0.5378} × H^{0.3964}
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, 93:62-66.
Gehan and George formula:
BSA = 0.0235 × W^{0.51456} × H^{0.42246}
Gehan EA, George SL, Cancer Chemother Rep 1970, 54:225-235
Boyd, Edith (1935). The Growth of the Surface Area of the Human Body. University of Minnesota. The Institute of Child Welfare, Monograph Series, No. x. London: Oxford University Press
Fujimoto formula:
BSA = 0.008883 × W^{0.444} × H^{0.663}
Fujimoto S, Watanabe T, Sakamoto A, Yukawa K, Morimoto K. Studies on the physical surface area of Japanese. 18. Calculation formulae in three stages over all ages. Nippon Eiseigaku Zasshi 1968;5:443-50.
Takahira formula:
BSA = 0.007241 × W^{0.425} × H^{0.725}
Fujimoto S, Watanabe T, Sakamoto A, Yukawa K, Morimoto K. Studies on the physical surface area of Japanese. 18. Calculation formulae in three stages over all ages. Nippon Eiseigaku Zasshi 1968;5:443-50.
Schlich formula:
Women BSA = 0.000975482 × W^{0.46} × H^{1.08}
Men BSA = 0.000579479 × W^{0.38} × H^{1.24}
Schlich E, Schumm M, Schlich M: "3-D-Body-Scan als anthropometrisches Verfahren zur Bestimmung der spezifischen Korperoberflache". Ernahrungs Umschau 2010;57:178-183
1. Greenberg, JA., Boozer, CN. 1999. "Metabolic mass, metabolic rate, caloric restriction, and aging in male Fischer 344 rats." Elsevier 113(2000): 37-48