Body Surface Area Calculator


Body Surface Area Calculator for calculating body surface area with the four best methods: DuBois and DuBois, Haycock, Gehan and George, Mosteller. Finally, a super easy-to-use BSA calculator.

Body Surface Area Calculator

Body Surface Area Calculator


How to calculate Body Surface Area?

The BSA Calculator uses four different methods to calculate the body surface area:

  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. BSA calculator formula for this method: BSA(m2) = 0.007184 * Height(cm)0.725 * Weight(kg)0.425
  2. 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. BSA calculator formula for this method: BSA (m2) = 0.024265 * Height(cm)0.3964 * Weight(kg)0.5378
  3. Gehan EA, George SL. Estimation of human body surface area from height and weight. Cancer Chemother Rep 1970;54:225-35. BSA calculator formula for this method: BSA (m2) = 0.0235 * Height(cm)0.42246 * Weight(kg)0.51456
  4. Mosteller RD. Simplified calculation of body-surface area. N Engl J Med 1987;317:1098. BSA calculator formula for this method: BSA (m2) = [(Height(cm) * Weight(kg))/3600]0.5

The most widely used formula for calculating Body Surface Area is the Du Bois formula, which has been shown to be equally as effective in estimating body fat in obese and non-obese patients, something the Body mass index fails to do.

How to use the Body Surface Area Calculator?

Select the unit first (imperial or metric) for BSA Calculation. Enter your height and weight and then click on the Calculate button of the BSA Calculator. The BSA Calculation results are shown immediately.

What is Body Surface Area Calculation used for?

Body Surface Area Calculation is used for clinical purposes, for example, to calculate drug dosages and medical indicators or assessments. BSA seems to be a better indicator of metabolic mass than body weight because it is less affected by abnormal adipose mass.  

Average values for Body Surface Area by age and gender

BSA Calculator: Average Male BSA Values

Neonate (newborn)2.612ft20.243m2
2 years6.060ft20.563m2
5 years8.471ft20.787m2
10 years13.304ft21.236m2
13 years17.255ft21.603m2
18 years21.313ft21.980m2
20-79 years22.173ft22.060m2
80+ years20.667ft21.920m2

BSA Calculator: Average Female BSA Values

Neonate (newborn)2.519ft20.234m2
2 years5.813ft20.540m2
5 years8.299ft20.771m2
10 years13.401ft21.245m2
13 years16.684ft21.550m2
18 years18.579ft21.726m2
20-79 years19.697ft21.830m2
80+ years17.631ft21.638m2

Body Surface Area averages in the tables above are based weight and height data from the U.S. NCHS National Health and Nutrition Examination Survey (2011-2014)

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