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.
How to calculate Body Surface Area?
The BSA Calculator uses four different methods to calculate the body surface area:
- 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
- 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
- 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
- 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)