Body Surface Area Calculator

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.

Q&A

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

AGE	IMPERIAL		METRIC
Neonate (newborn)	2.612	ft2	0.243	m2
2 years	6.060	ft2	0.563	m2
5 years	8.471	ft2	0.787	m2
10 years	13.304	ft2	1.236	m2
13 years	17.255	ft2	1.603	m2
18 years	21.313	ft2	1.980	m2
20-79 years	22.173	ft2	2.060	m2
80+ years	20.667	ft2	1.920	m2

BSA Calculator: Average Female BSA Values

AGE	IMPERIAL		METRIC
Neonate (newborn)	2.519	ft2	0.234	m2
2 years	5.813	ft2	0.540	m2
5 years	8.299	ft2	0.771	m2
10 years	13.401	ft2	1.245	m2
13 years	16.684	ft2	1.550	m2
18 years	18.579	ft2	1.726	m2
20-79 years	19.697	ft2	1.830	m2
80+ years	17.631	ft2	1.638	m2

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)