Body Surface Area Calculator

All four are computed and compared whichever you pick.
Body surface area
1.8447 m^2
Body Surface Area (BSA) Calculator
Equation used
Mosteller (1987)
Mosteller
1.8447 m^2
Du Bois
1.8481 m^2
Haycock
1.8468 m^2
Gehan & George
1.8539 m^2
Spread across the four equations
0.0092 m^2
Spread as a share of the headline figure
0.50 %
BSA / 1.73 m²
1.0663
Height used
175.00 cm
Weight used
70.000 kg
Worked out from Mosteller RD. Simplified calculation of body-surface area and 4 other sources.
An estimate from published regression equations, not a measurement. Different equations give different answers for the same person; when BSA is used to dose a drug, use the equation the protocol specifies, and leave the dose itself to the prescriber.

How this is worked out

4 steps
  1. Height 175 cm, weight 70 kg.
  2. Mosteller: sqrt(175 x 70 / 3600) = sqrt(3.402778) = 1.8447 m^2.
  3. The four published equations span 0.0092 m^2, or 0.5% of the headline figure.
  4. Indexed to the standard 1.73 m^2 this is a ratio of 1.0663.
All equationstable
formulabsadifferenceFromChosencitation
Mosteller (1987)1.84470Mosteller RD. Simplified calculation of body-surface area. N Engl J Med 1987;317:1098.
Du Bois & Du Bois (1916)1.84810.0035Du Bois D, Du Bois EF. A formula to estimate the approximate surface area if height and weight be known. Arch Intern Med 1916;17:863-871.
Haycock (1978)1.84680.0021Haycock GB, Schwartz GJ, Wisotsky DH. Geometric method for measuring body surface area. J Pediatr 1978;93:62-66.
Gehan & George (1970)1.85390.0092Gehan EA, George SL. Estimation of human body surface area from height and weight. Cancer Chemother Rep 1970;54:225-235.

Results are general information, not financial, tax, legal, medical or engineering advice.