Body Surface Area Calculator

Calculate your total body surface area (BSA) using multiple validated medical formulas

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💡 What is BSA? Body Surface Area is a measurement of the total surface area of the human body. It's more accurate than body weight for determining metabolic mass and is widely used in medical settings.
1.85
Body Surface Area (m²)
Calculated using Du Bois Formula (Most Widely Used)
All Formula Results
📊 Average BSA by Age & Gender
Category BSA (ft²) BSA (m²)
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
🏥 Clinical Uses of BSA
Metabolic Mass Indicator BSA is a more accurate indicator of metabolic mass than body weight. Metabolic mass represents the body's energy needs and includes bones, organs, muscles, blood, and nerves—excluding body fat which is not metabolically active.
Chemotherapy Dosing BSA is most commonly used to determine dosages for chemotherapy. Dosing based on BSA provides more consistent effects than body weight alone, though there are arguments about its accuracy for drugs with a narrow therapeutic index.
Cardiac Index BSA is used to calculate cardiac index, which relates a person's heart performance to their body size, allowing for standardized comparison across different individuals.
Limitations BSA may be less accurate at extremes of height and weight. BMI may be a better estimate in such cases. Despite limitations, BSA-based dosing remains more consistent than body weight alone.
📐 Formula Details & References
1. Du Bois Formula (Most Widely Used)
BSA = 0.007184 × W0.425 × H0.725
Du Bois D, Du Bois EF (1916). Archives of Internal Medicine 17(6): 863-71.

Effective for estimating body fat in both obese and non-obese patients.

2. Mosteller Formula
BSA = √(W × H / 3600)
Mosteller RD (1987). N Engl J Med 317:1098.
3. Haycock Formula
BSA = 0.024265 × W0.5378 × H0.3964
Haycock GB, Schwartz GJ, Wisotsky DH (1978). J Pediatr 93:62-66.

Validated in infants, children, and adults.

4. Gehan and George Formula
BSA = 0.0235 × W0.51456 × H0.42246
Gehan EA, George SL (1970). Cancer Chemother Rep 54:225-235.
5. Boyd Formula
BSA = 0.03330 × W(0.6157 - 0.0188 × log₁₀(W)) × H0.3
Boyd, Edith (1935). University of Minnesota, Institute of Child Welfare.
6. Fujimoto Formula
BSA = 0.008883 × W0.444 × H0.663
Fujimoto S, et al. (1968). Nippon Eiseigaku Zasshi 5:443-50.
7. Takahira Formula
BSA = 0.007241 × W0.425 × H0.725
Fujimoto S, et al. (1968). Nippon Eiseigaku Zasshi 5:443-50.
8. Schlich Formula (Gender-Specific)
Women: BSA = 0.000975482 × W0.46 × H1.08
Men: BSA = 0.000579479 × W0.38 × H1.24
Schlich E, Schumm M, Schlich M (2010). Ernahrungs Umschau 57:178-183.

Based on 3D body scan measurements.

Where: W = weight in kg, H = height in cm, BSA = body surface area in m²